MAX3162ECAI-T [MAXIM]
Line Transceiver, 1 Func, 2 Driver, 2 Rcvr, CMOS, PDSO28, 5.30 MM, MO-150, SSOP-28;
| 型号： | MAX3162ECAI-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 1 Func, 2 Driver, 2 Rcvr, CMOS, PDSO28, 5.30 MM, MO-150, SSOP-28 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总26页 (文件大小：471K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3580; Rev 0; 2/05
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
General Description
Features
♦ Single Supply Operation from +3V to +5.5V
♦ ESD Protection
±±5ꢀV ꢁuman ꢂoꢃy ꢄoꢃel
The MAX3160E/MAX3161E/MAX3162E are programma-
ble RS-232/RS-485/RS-422 multiprotocol transceivers.
The MAX3160E/MAX3161E are pin programmable as a
2Tx/2Rx RS-232 interface or a single RS-485/RS-422
transceiver. The MAX3162E is configured as a 2Tx/2Rx
RS-232 interface, and a single RS-485/RS-422 trans-
ceiver simultaneously.
♦ Pin-Selectable as 2Tx/2Rx RS-232 or Single
RS-485/RS-422 (ꢄAX3±60E/ꢄAX3±6±E)
♦ 2Tx/2Rx RS-232 anꢃ Single RS-485/RS-422
(ꢄAX3±62E)
The MAX3160E/MAX3161E/MAX3162E feature enhanced
electrostatic discharge (ESD) protection. All of the trans-
mitter outputs and receiver inputs are protected to 15ꢀk
using the Human Body Model.
♦ Pin-Selectable RS-232/RS-485 Transmitter Slew
Rates Reꢃuce EꢄI
♦ ±0ꢄbps RS-485 anꢃ ±ꢄbps RS-232 Data Rates
♦ Pin-Selectable ꢁalf-Duplex or Full-Duplex
All devices incorporate a proprietary low-dropout trans-
mitter output stage, and an on-board dual charge pump
to allow RS-232- and RS-485-/RS-422-compliant perfor-
mance from a +3k to +5.5k supply. The receivers feature
true fail-safe circuitry that guarantees a logic-high receiv-
er output when the receiver inputs are open or shorted.
These devices also feature pin-selectable transmitter
slew rates for RS-232 and RS-485/RS-422 modes. Slew-
rate limiting minimizes EMI and reduces reflections
caused by improperly terminated cables, allowing error-
free data transmission up to 250ꢀbps. Disabling slew-rate
limiting allows these devices to transmit at data rates up
to 10Mbps in RS-485/RS-422 mode and up to 1Mbps in
RS-232 mode. The MAX3160E/MAX3161E/MAX3162E
feature a 10nA shutdown mode, short-circuit limiting, and
thermal shutdown circuitry to protect against excessive
power dissipation.
RS-485/RS-422 Operation (ꢄAX3±60E/ꢄAX3±6±E)
♦ RS-485/RS-422 True Fail-Safe Receivers
♦ ±0nA Shutꢃown Supply Current
♦ ±/8-Unit Loaꢃ Allows up to 256 Transceivers on
the ꢂus
Ordering Information
PIN-
PACKAGE
CODE
PART
TEꢄP RANGE PACKAGE
ꢄAX3±60ECAP
MAX3160EEAP
ꢄAX3±6±ECAG
0°C to +70°C 20 SSOP
-40°C to +85°C 20 SSOP
0°C to +70°C 24 SSOP
A20-2
A20-2
A24-3
A24-3
A28-1
MAX3161EEAG -40°C to +85°C 24 SSOP
ꢄAX3±62ECAI
0°C to +70°C 28 SSOP
-40°C to +85°C 28 SSOP
MAX3162EEAI
A28-1
The MAX3160E/MAX3162E offer a flow-through pin-
out that facilitates board layout. The MAX3160E/
MAX3161E/MAX3162E are available in tiny SSOP pacꢀ-
ages and operate over the commercial and extended
temperature ranges.
Typical Operating Circuit
+3V TO +5.5V
2
________________________Applications
V
CC
RS-485/RS232
11
5
Point-of-Sales Equipment
Peripherals
MAX3160E
DI/T1IN
Industrial Controls
Networꢀing
TX
13
Z(B)/T1OUT
16
RS-232 to RS-485
Interface Converters
Security Systems
RTS
DE485/T2IN Y(A)/T2OUT
6
11
15
8
DB9
MAX3100
RO/R2OUT
R1OUT
A/R2IN
B/R1IN
RX
13
12
CTS
10
7
14
GND FAST HDPLX SHDN
10
SPI
RJ45
4
9
12
µP
SHDN
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
±
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
AꢂSOLUTE ꢄAXIꢄUꢄ RATINGS
CC
k
to GND..............................................................-0.3k to +6k
Output Short-Circuit Duration
k+ to GND................................................................-0.3k to +7k
k- to GND. ................................................................-7k to +0.3k
k+ - k- (Note 1)....................................................................+13k
Input koltages
T1IN, T2IN, DI, DE485, RE485, TE232, RE232, SHDN,
FAST, HDPLX, RS485/RS232 to GND. .................-0.3k to +6k
A, B, R1IN, R2IN to GND ................................................. 25k
Output koltages
T1OUT, T2OUT, Y, Z ..............................................Continuous
Continuous Power Dissipation (T = +70°C)
A
20-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
24-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
28-Pin SSOP (derate 9.1mW/°C above +70°C) ...........727mW
Operating Temperature Ranges
MAX316_CA_......................................................0°C to +70°C
MAX316_EA_...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
T1OUT, T2OUT, Y, Z to GND (k
= 0 or
CC
SHDN = GND) .............................................................. 13.2k
T1OUT, T2OUT to GND (k = 5.5k and
CC
SHDN = k ) .....................................................-13.2k to +9k
CC
R2OUT, R1OUT, RO to GND..................-0.3k to (k
+ 0.3k)
CC
Note ±: k+ and k- can have maximum magnitudes of 7k, but their absolute difference cannot exceed 13k.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CꢁARACTERISTICS
(k
= +3k to +5.5k, C1–C4 = 0.1µF when tested at +3.3k 10ꢁ% C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5k 10ꢁ%
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at k
= +3.3k and T = +25°C.) (Note 2)
CC A
MIN
MAX
PARAꢄETER
DC CꢁARACTERISTICS
SYꢄꢂOL
CONDITIONS
ꢄIN
TYP
ꢄAX
UNITS
MAX3160E/MAX3161E, no load,
RS-485/RS-232 = GND
1.2
2.8
k
Standby Current
I
mA
µA
CC
CC
MAX3160E/MAX3161E, no load,
2.5
3
5.5
6
RS-485/RS-232 = k
CC
MAX3162E, no load
SHDN = GND, receiver inputs open or
grounded
k
Shutdown Current
I
0.01
1
CC
SHDN
RE485
RE232
RS-232
)
TRANSꢄITTER AND LOGIC INPUTS (DI, T±IN, T2IN, DE485,
, TE232,
, FAST, ꢁDPLX, SHDN, RS-485/
0.8
Logic-Input Low
k
k
IL
k
k
= +3.3k
= +5k
2.0
2.4
CC
CC
Logic-Input High
k
k
IH
Logic-Input Leaꢀage Current
Transmitter Logic Hysteresis
I
0.01
0.5
1
µA
k
INL
k
HYS
RS-232 AND RS-485/RS-422 RECEIVER OUTPUTS (R±OUT, R2OUT, RO)
Receiver Output-koltage Low
Receiver Output-koltage High
k
I
= 2.5mA
= -1.5mA
0.4
k
k
OL
OUT
OUT
k
I
k
- 0.6
CC
OH
Receiver Output Short-Circuit
Current
I
0 ≤ k ≤ k
CC
20
85
1
mA
µA
OSR
OZR
O
Receiver Output Leaꢀage
Current
I
Receivers disabled
0.05
2
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
ELECTRICAL CꢁARACTERISTICS (continueꢃ)
(k
= +3k to +5.5k, C1–C4 = 0.1µF when tested at +3.3k 10ꢁ% C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5k 10ꢁ%
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at k
= +3.3k and T = +25°C.) (Note 2)
CC A
MIN
MAX
PARAꢄETER
SYꢄꢂOL
CONDITIONS
ꢄIN
TYP
ꢄAX
UNITS
RS-232 RECEIVER INPUTS (R±IN, R2IN)
Input koltage Range
-25
+25
0.8
k
Logic-Input Low
k
k
= +3.3k
= +5k
2.0
2.4
CC
CC
Logic-input High
k
k
Input Hysteresis
0.5
5
k
k
= +3.0k to 5.5k
= 0
3
6
7
CC
CC
Input Resistance
ꢀΩ
11
16
RS-485/RS-422 RECEIVER INPUTS (Note 3)
MAX3160E
48
96
Input Resistance
R
-7k < k
< +12k
ꢀΩ
IN
CM
MAX3161E/
MAX3162E
k
k
k
k
= +12k
= -7k
0.25
CM
CM
CM
CM
MAX3160E
MAX3161E/MAX3162E
-7k ≤ k ≤ +12k
-0.15
0.125
-0.075
-50
Input Current
I
mA
IN
= +12k
= -7k
Input Differential Threshold
Input Hysteresis
k
-200
mk
mk
TH
CM
∆k
30
TH
RS-232 TRANSꢄITTER OUTPUTS (T±OUT, T2OUT)
Both transmitter outputs loaded with 3ꢀΩ
to GND
Output koltage Swing
5
5.4
k
Output Resistance
k
= k+ = k- = 0, T_OUT = 2k
300
10M
30
Ω
CC
Output Short-Circuit Current
I
T_OUT = GND
60
125
25
mA
SC
MAX3160E
MAX3161E
MAX3162E
k
= 9k
OUT
TE232 = GND or SHDN =
GND
Output Leaꢀage Current
I
µA
O
25
RS-485/RS-422 TRANSꢄITTER OUTPUTS (Y, Z)
R = 27Ω
(RS-485)
1.5
2
Differential Output koltage
k
Figure 1
k
OD
R = 50Ω
(RS-422)
Change in Magnitude of
Differential Output koltage for
Complementary Output States
|∆k
|
|
R = 27Ω or 50Ω, Figure 1
R = 27Ω or 50Ω, Figure 1
0.2
3
k
k
OD
Common-Mode Output koltage
k
OC
Change in Magnitude of
Common-Mode Output koltage
for Complementary Output
States
|∆k
R = 27Ω or 50Ω, Figure 1
0.2
k
OC
_______________________________________________________________________________________
3
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
ELECTRICAL CꢁARACTERISTICS (continueꢃ)
(k
= +3k to +5.5k, C1–C4 = 0.1µF when tested at +3.3k 10ꢁ% C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5k 10ꢁ%
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at k
MAX
= +3.3k and T = +25°C.) (Note 2)
CC A
MIN
PARAꢄETER
SYꢄꢂOL
CONDITIONS
k or k = -7k to +12k
ꢄIN
TYP
ꢄAX
UNITS
Output Short-Circuit Current
I
250
mA
SC
Y
Z
MAX3160E
MAX3161E
MAX3162E
125
25
k or k = -7k or +12k,
DE485 = GND or SHDN =
GND
Y
Z
Output Leaꢀage Current
µA
IO
25
RS-232 TRANSꢄITTER TIꢄING CꢁARACTERISTICS (SLOW ꢄODE, FAST = GND, 250ꢀbps, one transmitter switching)
Maximum Data Rate
Transmitter Sꢀew
R = 3ꢀΩ, C = 1000pF
250
ꢀbps
ns
L
L
t
R = 3ꢀΩ, C = 150pF, Figure 6
25
TSKEW
L
L
C = 150pF
L
to 1000pF
k
= +3.3k, T = +25°C,
A
CC
6
4
30
30
R = 3ꢀΩ to 7ꢀΩ,
measured from +3.0k to
-3.0k or -3.0k to +3.0k
L
Transition-Region Slew Rate
k/µs
C = 150pF
L
to 2500pF
RS-232 TRANSꢄITTER TIꢄING CꢁARACTERISTICS (FAST ꢄODE, FAST = V , ±ꢄbps, one transmitter switching)
CC
k
= +3k to +4.5k, R = 3ꢀΩ, C = 250pF
1
CC
L
L
Maximum Data Rate
Transmitter Sꢀew
Mbps
ns
k
= +4.5k to +5.5k, R = 3ꢀΩ,
CC
L
1
C = 1000pF
L
t
R = 3ꢀΩ, C = 150pF, Figure 6
10
TSKEW
L
L
k
= +3.3k, T = +25°C, R
A L
CC
MAX3160E
13
24
150
150
= 3ꢀΩ to 7ꢀΩ, C = 150pF to
1000pF, measured from +3.0k
to -3.0k or -3.0k to +3.0k
L
Transition-Region Slew Rate
k/µs
MAX3161E
MAX3162E
RS-232 RECEIVER TIꢄING CꢁARACTERISTICS
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Receiver Sꢀew
t
,t
R_IN to R_OUT, C = 15pF, Figure 5
0.15
200
200
100
µs
ns
ns
ns
PHL PLH
L
t
t
,t
C = 50pF, Figures 2, 10, MAX3162E
L
RZL RZH
,t
C = 15pF, Figures 2, 10, MAX3162E
L
RLZ RHZ
t
C = 50pF, Figure 5
L
RSKEW
RS-485/RS-422 DRIVER TIꢄING CꢁARACTERISTICS (SLOW ꢄODE, FAST = GND, 250ꢀbps)
Differential Driver Propagation
Delay
t
t
,
DPHL
DPLH
R
DIFF
R
DIFF
R
DIFF
= 54Ω, C = 50pF, Figures 3, 7
200
200
400
400
800
800
200
ns
ns
ns
L
Differential Driver Rise and Fall
Time
t
DR,
= 54Ω, C = 50pF, Figures 3, 7
L
t
DF
Differential Driver Propagation
Delay Sꢀew
t
= 54Ω, C = 50pF, Figures 3, 7
L
DSKEW
Driver Output Enable Time
Driver Output Disable Time
t
t
, t
C = 50pF, Figures 4, 8
400
200
900
400
ns
ns
DZH DZL
L
, t
C = 50pF, Figures 4, 8
L
DLZ DHZ
4
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
ELECTRICAL CꢁARACTERISTICS (continueꢃ)
(k
= +3k to +5.5k, C1–C4 = 0.1µF when tested at +3.3k 10ꢁ% C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5k 10ꢁ%
CC
T
A
= T
to T
, unless otherwise noted. Typical values are at k
MAX
= +3.3k and T = +25°C.) (Note 2)
CC A
MIN
PARAꢄETER
SYꢄꢂOL
CONDITIONS
ꢄIN
TYP
ꢄAX
UNITS
RS-485/RS-422 DRIVER TIꢄING CꢁARACTERISTICS FAST ꢄODE, FAST = V , ±0ꢄbps)
CC
Differential Driver Propagation
Delay
t
DPHL,
R
DIFF
R
DIFF
R
DIFF
= 54Ω, C = 50pF, Figures 3, 7
60
10
120
25
ns
ns
ns
L
t
DPLH
Differential Driver Rise and Fall
Times
t
, t
DR DF
= 54Ω, C = 50pF, Figures 3, 7
L
Differential Driver Propagation
Delay Sꢀew
t
= 54Ω, C = 50pF, Figures 3, 7
10
DSKEW
L
Driver Output Enable Time
Driver Output Disable Time
t
t
,t
C = 50pF, Figures 4, 8
400
200
900
400
ns
ns
DZH DZL
L
,t
C = 50pF, Figures 4, 8
L
DHZ DLZ
RS-485/RS-422 RECEIVER TIꢄING CꢁARACTERISTICS
t
t
,
RPLH
Receiver Propagation Delay
C = 15pF, Figures 9, 11
80
1
150
10
ns
ns
L
RPHL
Receiver Propagation Delay
Sꢀew
t
C = 15pF, Figures 9, 11
L
RSKEW
Receiver Output Enable Time
t
t
, t
MAX3162E, C = 50pF, Figures 2, 10
100
100
ns
ns
RZL RZH
L
Receiver Output Disable Time
ESD PROTECTION
, t
MAX3162E, C = 15pF, Figures 2, 10
L
RLZ RHZ
R_IN, T_OUT, A, B, Y, Z
Human Body Model
15
ꢀk
Note 2: All currents into the device are positive. All currents out of the device are negative.
Note 3: Applies to A, B for MAX3162E and MAX3160E/MAX3161E with HDPLX = GND, or Y, Z for MAX3160E/MAX3161E with
HDPLX = k
CC.
Typical Operating Characteristics
(k
= +3.3k, 250ꢀbps data rate, C
, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3ꢀΩ to
BYPASS
CC
ground, T = +25°C, unless otherwise noted.)
A
RS-232 TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE (FAST = GND)
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST = GND)
10.00
RS-232 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (FAST = V
)
CC
18
16
14
12
10
8
10.00
7.50
DATA RATE = 1Mbps
7.50
5.00
RISING
5.00
2.50
2.50
FALLING
0
0
-2.50
-5.00
-7.50
-10.00
-2.50
-5.00
-7.50
-10.00
6
4
2
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)
(k
= +3.3k, 250ꢀbps data rate, C
, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3ꢀΩ to
BYPASS
CC
ground, T = +25°C, unless otherwise noted.)
A
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE WHEN
TRANSMITTING DATA (RS-232 MODE)
MAX3160E/MAX3161E
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
RS-232 TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE (FAST = V
)
CC
60
50
40
30
20
10
0
3.0
2.5
2.0
1.5
1.0
0.5
0
110
100
90
DATA RATE =
1Mbps
RS-485 MODE
RS-232 MODE
RISING
80
70
DATA RATE = 250kbps
60
50
FALLING
40
30
20
10
0
DATA RATE = 20kbps
0
1000
2000
3000
4000
5000
-40
-15
10
35
60
85
0
400
800
1200
1600
2000
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
RS-485/RS-422 OUTPUT CURRENT
vs. DRIVER-OUTPUT LOW VOLTAGE
SHUTDOWN CURRENT
vs. TEMPERATURE
RS-485/RS-422 OUTPUT CURRENT
vs. DRIVER-OUTPUT LOW VOLTAGE
140
120
100
80
250
200
150
100
50
140
120
100
80
60
60
40
40
20
20
0
0
0
-7
-5
-3
-1
1
3
5
-40
-15
10
35
60
85
0
2
4
6
8
10
12
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
RECEIVER OUTPUT CURRENT vs. RECEIVER-
OUTPUT LOW VOLTAGE
30
RS-485/RS-422 DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
RS-485/RS-422 DRIVER DIFFERENTIAL
OUTPUT vs. TEMPERATURE
100
90
80
70
60
50
40
30
20
10
0
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
R
= 100Ω
DIFF
FIGURE 1
25
20
15
10
5
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOW VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOW VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
6
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)
(k
= +3.3k, 250ꢀbps data rate, C
, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3ꢀΩ to
BYPASS
CC
ground, T = +25°C, unless otherwise noted.)
A
RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = V
RS-485/RS-422 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
RECEIVER OUTPUT CURRENT
vs. RECEIVER-OUTPUT HIGH VOLTAGE
)
CC
100
90
80
70
60
50
40
30
20
10
0
50
45
40
35
30
25
20
14
C = 50pF
L
R
= 54Ω
DIFF
RISING
12
10
8
DATA RATE = 10Mbps
FALLING
RISING
FALLING
6
4
2
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT-HIGH VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
RS-485/RS-422 DRIVER PROPAGATION
RS-485/RS-422 DRIVER PROPAGATION
(FAST = V , 10Mbps)
RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = GND)
(FAST = GND, 250kbps)
CC
MAX3160E toc18
MAX3160E toc17
400
C = 50pF
L
C = 50pF
L
R
= 54Ω
DIFF
R
= 54Ω
DI
2V/div
DIFF
DI
2V/div
350
300
250
200
150
100
RISING
FALLING
V
- V
Z
V
- V
Y
Y
Z
2V/div
2V/div
C = 50pF
L
R
= 54Ω
DIFF
DATA RATE = 250kbps
1.0µs/div
20ns/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
RS-485/RS-422 RECEIVER PROPAGATION
RS-485/RS-422 RECEIVER PROPAGATION
I-V OUTPUT IMPEDANCE CURVE
IN RS-232 SHUTDOWN MODE
(FAST = V , 5Mbps)
(FAST = V , 5Mbps)
CC
CC
MAX3160E toc20
MAX3160E toc21
400
200
C = 15pF
L
C = 50pF
L
R
= 54Ω
V
- V
Z
DIFF
Y
2V/div
DE485
2V/div
0
-200
-400
-600
-800
-1000
V
- V
Z
Y
2V/div
RO
2V/div
4ns/div
100ns/div
-20 -15 -10 -5
0
5
10 15 20
OUTPUT VOLTAGE (V)
_______________________________________________________________________________________
7
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)
(k
= +3.3k, 250ꢀbps data rate, C
, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3ꢀΩ to
BYPASS
CC
ground, T = +25°C, unless otherwise noted.)
A
MAX3160E
RS-232 TRANSMITTER PROPAGATION
MAX3160E
RS-232 TRANSMITTER PROPAGATION
(FAST = GND, 250kbps)
(FAST = V , 250kbps)
CC
MAX3160E toc22
MAX3160E toc23
C = 1000pF
R = 7kΩ
L
L
C = 150pF
R = 7kΩ
L
L
DI
2V/div
DI
2V/div
T_OUT
5V/div
T_OUT
5V/div
1.0µs/div
1.0µs/div
MAX3161E/MAX3162E
RS-232 TRANSMITTER PROPAGATION
(FAST = V , 250kbps)
MAX3161E/MAX3162E
RS-232 TRANSMITTER PROPAGATION
CC
(FAST = GND, 250kbps)
MAX3160E toc25
MAX3160E toc24
C = 150pF
R = 7kΩ
L
L
C = 1000pF
L
R = 7kΩ
L
DI
2V/div
DI
2V/div
T_OUT
5V/div
T_OUT
5V/div
1.0µs/div
1.0µs/div
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (FAST = GND)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
WITH RS-232 RUNNING (FAST = GND)
10.00
7.50
12
10
8
INPUTS AT V AND GND
CC
2 TRANSMITTERS LOADED WITH 3kΩ
5.00
2.50
0
6
-2.50
-5.00
-7.50
-10.00
4
C = 50pF
L
2
R = 3kΩ
L
1 TRANSMITTER AT 250kbps
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
8
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
-in Description
PIN
NAꢄE
FUNCTION
ꢄAX3±60E
ꢄAX3±6±E
ꢄAX3±62E
1
2
1
2
3
4
5
1
2
3
4
5
C1+
Positive Terminal of the Positive Flying Capacitor
Positive Supply koltage
k
CC
3
C1-
GND
Negative Terminal of the Positive Flying Capacitor
Ground
4
—
T1OUT
RS-232 Driver Output
Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/RS-422 Receiver Input in Half-Duplex
Mode)/RS-232 Driver Output
5
—
—
6
—
6
Z(B)/T1OUT
—
—
Z
Inverting RS-485/RS-422 Driver Output
Inverting RS-485/RS-422 Driver Output in Full-Duplex Mode
(and Inverting RS-485/RS-422 Receiver Input in Half-Duplex
Mode)
—
Z(B)
Noninverting RS-485/RS-422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/RS-422 Receiver Input in
Half-Duplex Mode)/RS-232 Driver Output
6
—
—
7
—
7
Y(A)/T2OUT
—
—
Y
Noninverting RS-485/RS-422 Driver Output
Noninverting RS-485/RS-422 Driver Output in Full-Duplex
Mode (and Noninverting RS-485/RS-422 Receiver Input in
Half-Duplex Mode)
—
Y(A)
7
—
8
9
8
9
8
R1OUT
T2OUT
RS-232 Receiver Output
RS-232 Driver Output
10
—
RO/R2OUT
RS-485/RS-422 Receiver Output/RS-232 Receiver Output
Active-Low Shutdown-Control Input. Drive SHDN low to shut
down transmitters and charge pump.
9
11
—
13
10
SHDN
—
R2OUT
RS-232 Driver Output
Transmitter Speed-Select Input. Select slew-rate limiting for
RS-232 and RS-485/RS-422. Slew-rate limits with a logic-level
low.
10
—
11
12
—
13
14
11
—
FAST
RO
RS-485/RS-422 Receiver Output
Pin-Selectable Mode Functionality Input. Operates as
RS-485/RS-422 with a logic-level high% operates as RS-232
with a logic-level low.
RS-485/RS- 2 32
RS-485/RS-422 Receiver Enable Input. Logic-level low enables
RS-485/RS-422 receivers.
—
—
12
—
RE485
Pin-Selectable Mode Functionality Input. Operates in full-
duplex mode when low% operates in half-duplex mode when
high.
12
14
HDPLX
_______________________________________________________________________________________
9
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
-in Description (continued)
PIN
NAꢄE
A/R2IN
B/R1IN
RE232
FUNCTION
ꢄAX3±60E
ꢄAX3±6±E
ꢄAX3±62E
Noninverting RS-485/RS-422 Receiver Input/RS-232 Receiver
Input
13
—
—
14
—
—
—
—
Inverting RS-485/RS-422 Receiver Input/RS-232 Receiver Input
RS-232 Receiver Enable. Logic-level low enables
RS-232 receivers.
15
—
15
—
—
16
—
17
—
18
19
20
—
—
—
—
15
19
—
16
20
17
21
18
22
23
24
—
—
—
—
17
—
16
18
—
19
25
20
26
27
28
21
22
23
24
A
DE485/T2IN
TE232
B
Noninverting RS-485/RS-422 Receiver Input
RS-485/RS-422 Driver Enable/RS-232 Driver Input
RS-232 Transmitter Output Enable
Inverting RS-485/RS-422 Receiver Input
RS-485/RS-422 Driver Input/RS-232 Driver Input
RS-232 Receiver Input
DI/T1IN
R2IN
k-
Negative Charge-Pump Rail
R1IN
C2-
RS-232 Receiver Input
Negative Terminal of the Negative Flying Capacitor
Positive Terminal of the Negative Flying Capacitor
Positive Charge-Pump Rail
C2+
k+
T2IN
DE485
DI
RS-232 Driver Input
RS-485/RS-422 Driver Enable Input
RS-485/RS-422 Driver Input
T1IN
RS-232 Driver Input
±0 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
MAX3160E Functional Diagram
RS-485 MODE
RS-232 MODE
V
CC
V
CC
C1+
V+
C1+
V+
C2+
C2-
V-
1
20
1
2
20
19
18
17
16
15
14
13
12
11
C2
C3
C1
C1
V
V
CC
C2+
C2-
CC
2
3
19
18
17
CHARGE
PUMP
CHARGE
PUMP
C3
C2
C1-
C1-
3
C
BYPASS
C
BYPASS
GND
V-
4
5
6
GND
4
C4
C4
Z
T1
16
15
5
RS-485
OUTPUTS
LOGIC
INPUTS
D
RS-232
OUTPUTS
LOGIC
INPUTS
Y
T2
R1
R2
6
DE485
B
A
7
14
7
LOGIC
OUTPUTS
RS-485
INPUTS
RS-232
INPUTS
R0
LOGIC
OUTPUT
8
8
9
R
13
12
11
LOGIC
INPUT
9
SHDN
FAST
SHDN
FAST
HDPLX
HDPLX
RS-485/RS-232
MAX3160E
MAX3160E
10
10
RS-485/RS-232
______________________________________________________________________________________ ±±
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
MAX3161E Functional Diagram
RS-232 MODE
RS-485 MODE
V
CC
V
CC
C1+
V+
C2+
C2-
V-
C1+
V+
1
1
2
24
23
22
21
20
19
18
17
16
15
14
24
C3
C3
C1
C
C1
V
CC
V
CC
C2+
C2-
2
3
4
23
22
21
CHARGE
PUMP
CHARGE
PUMP
C2
C2
C1-
C1-
3
C
BYPASS
BYPASS
GND
V-
GND
4
C4
C4
T1
5
6
20
19
RS-232
OUTPUT
5
LOGIC
INPUTS
LOGIC
INPUTS
Z
6
RS-485
OUTPUTS
D
Y
7
8
18
17
7
DE485
RS-232
INPUTS
T2
R1
R2
RS-232
OUTPUT
8
B
A
9
16
9
RS-485
INPUTS
LOGIC
OUTPUTS
R0
LOGIC
OUTPUT
10
10
R
15
14
LOGIC
INPUT
11 SHDN
12
11 SHDN
12 FAST
HDPLX
HDPLX
MAX3161E
MAX3161E
FAST
RS-485/RS-232 13
RS-485/RS-232 13
±2 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
MAX3162E Functional Diagram
Test Circuits
Y
R
R
V
CC
V
OD
C1+
V+
1
28
C3
C1
V
OC
V
CC
C2+
C2-
2
3
4
27
26
25
CHARGE
PUMP
C2
Z
C1-
C
BYPASS
Figure 1. RS-485/RS-422 Driver DC Test Load
GND
V-
C4
T1
RS-232
5
6
7
24
23
1kΩ
OUTPUT
TEST POINT
RECEIVER
V
CC
OUTPUT
Z
S1
C
L
LOGIC
RS-485
OUTPUTS
1k
D
INPUTS
DE485
T2
Y
22
S2
RS-232
OUTPUT
8
9
211
20
Figure 2. RS-485/RS-422 and RS-232 Receiver Enable/Disable
Timing Test Load
R1
R2
RS-232
INPUTS
LOGIC
OUTPUTS
10
19
3V
B
A
11
12
18
17
DE485
RO
RE485
RS-485
INPUTS
R
LOGIC
INPUT
Y
DI
R
DIFF
V
OD
C
L
13 SHDN
14 FAST
16
15
TE232
RE-232
LOGIC
INPUTS
Z
MAX3162E
Figure 3. RS-485/RS-422 Driver Timing Test Circuit
V
CC
S1
500Ω
OUTPUT
UNDER TEST
C
L
S2
Figure 4. RS-485/RS-422 Driver Enable/Disable Timing Test Load
______________________________________________________________________________________ ±3
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Test Circuits (continued)
+3V
INPUT
+3V
1.5V
0V
1.5V
50%
1.5V
1.5V
INPUT
0V
V
V+
CC
OUTPUT
50%
GND
0V
V-
OUTPUT
t
t
PHL
PLH
t
t
PHL
PLH
t
t
- t
t
= | t - t
PLH PHL
|
SKEW = | PLH PHL |
RSKEW
Figure 6. RS-232 Transmitter Propagation-delay Timing
Figure 5. RS-232 Receiver Propagation-Delay Timing
3V
3V
DE485
DI
1.5V
1.5V
1.5V
1.5V
0
0
t
t
DPHL
DPLH
1/2 V
O
t
t
DLZ
DZL
Z
Y, Z
V
O
2.3V
V
V
+ 0.5V
- 0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
V
Y
OL
1/2 V
O
V
= V - V
y
DIFF
z
V
O
0
O
Y, Z
0
V
DIFF
90%
t
90%
2.3V
OH
10%
10%
-V
t
t
DF
DR
t
t
DHZ
DZH
t
- t
DSKEW = | DPLH DPHL |
Figure 8. RS-485/RS-422 Driver Enable and Disable Times
Figure 7. RS-485/RS-422 Driver Propagation Delays
3V
RE232 OR RE485
1.5V
1.5V
0
V
OH
RO
V
CC
/2
V /2
CC
V
OL
t
t
OUTPUT
RLZ
RZL
V
CC
t
t
RO
1.5V
RPHL
RPLH
V
V
+ 0.5V
- 0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
A
B
1V
-1V
INPUT
= | t
RO
t
- t
|
1.5V
OH
RSKEW
RPLH RPHL
0
t
t
RHZ
RZH
Figure 10. MAX3162 RS-485/RS-422 and RS-232 Receiver
Enable and Disable Times
Figure 9. RS-485/RS-422 Receiver Propagation Delays
B
V
ID
RO
R
A
C
L
Figure 11. RS-485/RS-422 Receiver Propagation Delays Test
Circuit
±4 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
MAX3161E
Detailed Description
The MAX3161E is a 2T /2R RS-232 transceiver in
X
X
The MAX3160E/MAX3161E/MAX3162E +3k to +5.5k,
multiprotocol transceivers can be pin-configured in a
number of RS-232 and RS-485/RE-422 interface combi-
nations. These circuit configurations are ideal for the
design of RS-232 to RS-485 converters, multiprotocol
buses, or any application that requires both RS-232 and
RS-485 transceivers. The slew rate of these devices is
on-the-fly pin selectable, allowing reduced EMI data
rates, or up to 10Mbps RS-485 communications. Power
consumption can be reduced to 10nA by using the
shutdown function, but the RS-232 receivers remain
active allowing other devices to query the interface con-
troller. A flow-through pinout and the space-saving
SSOP pacꢀages (available in commercial and extended
temperature ranges) facilitate board layout.
RS-232 mode or a single RS-485/RS-422 transceiver in
RS-485 mode. When in RS-485 mode, the unused RS-
232 transmitter and receiver outputs are disabled. When
in RS-232 mode, the RS-485 transmitter outputs are dis-
abled and the RS-232 receiver inputs are 5ꢀΩ to GND.
The RS-485 receiver inputs are always 1/8-unit load.
Logic lines are shared between the two protocols and are
used for signal inputs and as an RS-485 driver enable.
MAX3162E
The MAX3162E is a 2Tx/2Rx RS-232 transceiver and a
single RS-485/RS-422 transceiver simultaneously. All
drivers, receivers, and transmitters can be enabled or
disabled by pin selection. All outputs are high-imped-
ance when not activated. RS-232 receiver inputs are
5ꢀΩ when enabled, and RS-485 receiver inputs are
1/8-unit load.
Device ꢁelection
The MAX3160E/MAX3161E/MAX3162E contain RS-232
transceivers and an RS-485/RS-422 transceiver. The
primary difference between the devices is the multi-
plexing of the I/O ports.
FastꢂMode Operation
The FAST control input is used to select the slew-rate
limiting of the RS-232 transmitters and the RS-485/
RS-422 drivers. With FAST unasserted, the RS-232
transmitters and the RS-485/RS-422 driver are slew-rate
limited to reduce EMI. RS-232 data rates up to 1Mbps
and RS-485/RS-422 data rates up to 10Mbps are possi-
ble when FAST is asserted. FAST can be changed dur-
ing operation without interrupting data communications.
The MAX3160E has common transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 trans-
ceivers, and common digital I/O ports. The MAX3160E
is optimized for multiprotocol operation on a single
interface bus and comes in a 20-pin SSOP pacꢀage.
The MAX3161E has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 trans-
ceivers, and common digital I/O ports. The MAX3161E is
optimized for multiplexing a single UART across two inter-
face buses and is available in a 24-pin SSOP pacꢀage.
HalfꢂDuplex Rꢁꢂ48ꢀ/Rꢁꢂ422 Operation
Asserting HDPLX places the MAX3160E/MAX3161E in
half-duplex mode. The RS-485 receiver inputs are inter-
nally connected to the driver outputs. To receive
RS-485 data, disable the RS-485 outputs by driving
DE485 low. HDPLX has no affect on RS-232 operation.
The MAX3162E has separate transmitter outputs and
receiver inputs for its RS-232 and RS-485/RS-422 trans-
ceivers, and separate digital I/O ports. The MAX3162E
is optimized for protocol translation between two inter-
face buses and comes in a 28-pin SSOP pacꢀage.
Lowꢂ-ower ꢁhutdown
The MAX3160E/MAX3161E/MAX3162E have an active-
low shutdown control input, SHDN. When SHDN is dri-
ven low, the charge pump and transmitters are shut
down and supply current is reduced to 10nA. The
RS-232 receiver outputs remain active if in RS-232
mode. The charge-pump capacitors must be
recharged when coming out of shutdown before resum-
ing operation in either RS-232 or RS-485/RS-422 mode
(Figure 12).
See Tables 1–12, the Functional Diagrams, and the fol-
lowing descriptions for details on each device.
MAX3160E
The MAX3160E is a 2T /2R RS-232 transceiver in
X
X
RS-232 mode, capable of RS-232-compliant communi-
cation. Assertion of RS-485/RS-232 converts the device
to a single RS-485 transceiver by multiplexing the RS-
232 I/O ports to an RS-485 driver and receiver pair. The
logic inputs now control the driver input and the driver
enable. One logic output carries the RS-485 receiver out-
put, and the other is tri-stated. The receiver input imped-
ance is dependent on the device mode and is 1/4-unit
load for RS-485 operation and 5ꢀΩ for RS-232 operation.
Dual Chargeꢂ-ump koltage Converter
The MAX3160E/MAX3161E/MAX3162E’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5k (doubling charge
pump), and -5.5k (inverting charge pump), for input
voltages (k ) over the +3.0k to +5.5k range. The
CC
charge pumps operate in a discontinuous mode. If the
______________________________________________________________________________________ ±5
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
magnitude of either output voltage is less than +5.5k,
the charge pumps are enabled. If the magnitude of
both output voltages exceeds +5.5k, the charge
pumps are disabled. Each charge pump requires a fly-
ing capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the k+ and k- supplies (see the
Functional Diagrams).
The receivers convert RS-232 signals to CMOS-logic out-
put levels. All receivers have inverting outputs that
remain active in shutdown. The MAX3160E/MAX3161E/
MAX3162E permit their receiver inputs to be driven to
25k. Floating receiver input signals are pulled to
ground through internal 5ꢀΩ resistors, forcing the out-
puts to a logic-high. The MAX3162E has transmitter and
receiver enable pins that allow its outputs to be tri-stated.
Rꢁꢂ48ꢀ/Rꢁꢂ422 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-485/RS-422
transceivers feature fail-safe circuitry that guarantees a
logic-high receiver output when the receiver inputs are
open or shorted, or when they are connected to a ter-
minated transmission line with all drivers disabled (see
the Fail-Safe Section). The MAX3160E/MAX3161E/
MAX3162E also feature pin-selectable reduced slew-
rate drivers that minimize EMI and reduce reflections
caused by improperly terminated cables, allowing
error-free data transmission up to 250ꢀbps The trans-
mitters can operate at speeds up to 10Mbps with the
slew-rate limiting disabled. Drivers are short-circuit cur-
rent limited and thermally limited to protect them
against excessive power dissipation. Half-duplex com-
munication is enabled by driving HDPLX high
(MAX3160E/MAX3161E.)
1ꢀ5k EꢁD -rotection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against ESD encoun-
tered during handling and assembly. The MAX3160E/
MAX3161E/MAX3162E receiver inputs and transmitter
outputs have extra protection against static electricity
found in normal operation. Maxim’s engineers developed
state-of-the-art structures to protect these pins against
15ꢀk ESD, without damage. After an ESD event, the
MAX3160E/MAX3161E/MAX3162E continue worꢀing
without latchup.
The receiver inputs and transmitter outputs are charac-
terized for 15ꢀk ESD protection using the Human
Body Model
ESD Test Conditions
Failꢂꢁafe
The MAX3160E/MAX3161E/MAX3162E guarantee a
logic-high RS-485 receiver output when the receiver
inputs are shorted or open, or when they are connected
to a terminated transmission line with all drivers dis-
abled. This is done by having the receiver threshold
between -50mk and -200mk. If the differential receiver
input voltage (A-B) is greater than or equal to -50mk,
RO is logic-high. If A-B is less than or equal to -200mk,
RO is logic-low. In the case of a terminated bus with all
transmitters disabled, the receiver’s differential input
voltage is pulled to 0 by the termination. This results in
a logic-high with a 50mk minimum noise margin.
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 13a shows the Human Body Model, and Figure
13b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5ꢀΩ resistor.
Rꢁꢂ232 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-232 trans-
mitters are inverting-level translators that convert
CMOS-logic levels to 5k EIA/TIA-232-compliant lev-
els. The transmitters are guaranteed at a 250ꢀbps data
rate in slew-rate limited mode (FAST = GND) with
worst-case loads of 3ꢀΩ in parallel with 1000pF. Data
rates up to 1Mbps can be achieved by asserting FAST.
When powered down or in shutdown, the MAX3160E/
MAX3161E/MAX3162E outputs are high impedance
and can be driven to 13.2k. The transmitter inputs do
not have pullup resistors. Connect unused inputs to
ground or k
.
CC
±6 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
R
R
1MΩ
D
C
SHDN
5V/div
1.5kΩ
T1OUT
2V/div
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
GND
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
100pF
STORAGE
CAPACITOR
s
T2OUT
2V/div
SOURCE
40µs/div
Figure 13a. Human Body ESD Test Model
Figure 12. RS-232 Transmitter Outputs when Exiting Shutdown
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing and
assembly. Of course, all pins (not just RS-485 inputs)
require this protection during manufacturing. Therefore,
the Machine Model is less relevant to the I/O ports than
are the Human Body Model and IEC 1000-4-2.
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
AMPERES
36.8%
10%
0
Applications Information
TIME
0
t
RL
t
Capacitor ꢁelection
The capacitor type used for C1–C4 is not critical for
proper operation% polarized or nonpolarized capacitors
can be used. Ceramic chip capacitors with an X7R
dielectric provide the best combination of performance,
cost, and size. The charge pump requires 0.1µF
capacitors for 3.3k operation. For other supply volt-
ages, see Table 13 for required capacitor values. Do
not use values smaller than those listed in Table 13.
Increasing the capacitor values reduces ripple on the
transmitter outputs and slightly reduces power con-
sumption. C2, C3, and C4 can be changed without
changing C1’s value. ꢁowever, ꢃo not increase C±
without also increasing the values of C2, C3, C4,
DL
CURRENT WAVEFORM
Figure 13b. Human Body Model Current Waveform
usually rises at low temperatures, influences the
amount of ripple on k+ and k-.
-owerꢂꢁupply Decoupling
In applications that are sensitive to power-supply noise,
decouple k
to ground with a capacitor of the same
CC
value as reservoir capacitors C2, C3, and C4. Connect
the bypass capacitor as close to the IC as possible.
anꢃ C
to maintain the proper ratios to the
ꢂYPASS
other capacitors.
When using the minimum required capacitor values,
maꢀe sure the capacitance value does not degrade
excessively with temperature or voltage. This is typical
of Y5k and Z5U dielectric ceramic capacitors. If in
doubt, use capacitors with a larger nominal value. The
capacitor’s equivalent series resistance (ESR), which
______________________________________________________________________________________ ±7
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Rꢁꢂ232 Transmitter Outputs
V
CC
when Exiting ꢁhutdown
Figure 12 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high, the other is low). Each
transmitter is loaded with 3ꢀΩ in parallel with 1000pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when k- exceeds
approximately -3k.
C
BYPASS
V
CC
C1+
V+
V-
C1
C2
C3
C4
C1-
C2+
MAX3160E
MAX3161E
MAX3162E
C2-
T_ OUT
R_ IN
T_ IN
High Data Rates
The MAX3160E/MAX3161E/MAX3162E maintain the
RS-232 5k required minimum transmitter output voltage
even at high data rates. Figure 14 shows a transmitter
loopbacꢀ test circuit. Figure 15 shows a loopbacꢀ test
result at 250ꢀbps, and Figure 16 shows the same test at
1Mbps. Figure 15 demonstrates a single slew-rate limit-
ed transmitter driven at 250ꢀbps (FAST = GND) into an
RS-232 load in parallel with 1000pF. Figure 17 shows a
single transmitter driven at 1Mbps (FAST asserted),
loaded with an RS-232 receiver in parallel with 1000pF.
These transceivers maintain the RS-232 5k minimum
transmitter output voltage at data rates up to 1Mbps.
R_ OUT
SHDN
1000pF
5k
V
CC
GND
Figure 14. Loopback Test Circuit
The MAX3160E/MAX3161E/MAX3162E inputs are pro-
tected to RS-232 levels of 25k for the receiver inputs
and 13k for the transmitter/driver outputs. This pro-
vides additional protection for the RS-485 transceivers
against ground differential or faults due to miswiring.
2ꢀ6 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12ꢀΩ
(one-unit load), and the standard driver can drive up to
32-unit loads. The MAX3160E has a 1/4-unit load
receiver input impedance (48ꢀΩ), allowing up to 128
transceivers to be connected in parallel on one com-
munication line. The MAX3161E/MAX3162E have a 1/8-
unit load receiver input impedance (96ꢀΩ), allowing up
to 256 transceivers to be connected in parallel on one
communication line. Any combination of these devices
and/or other RS-485 transceivers with a total of 32-unit
loads or fewer can be connected to the line.
Rꢁꢂ48ꢀ/Rꢁꢂ422 Reduced
EMI and Reflections
The MAX3160E/MAX3161E/MAX3162E can be config-
ured for slew-rate limiting by pulling FAST low. This mini-
mizes EMI and reduces reflections caused by improperly
terminated cables. Operation in slew-rate limited mode
reduces the amplitudes of high-frequency harmonics.
Rꢁꢂ48ꢀ/Rꢁꢂ422 Line Length vs. Data
Length
The RS-485/RS-422 standard covers line lengths up to
4000ft. For line lengths greater than 4000ft, use the
repeater application shown in Figure 17.
Rꢁꢂ48ꢀ/Rꢁꢂ422
Driver Output -rotection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldbacꢀ current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
the Typical Operating Characteristics). The second, a
thermal shutdown circuit, forces the driver outputs into
a high-impedance state if the die temperature becomes
excessive, typically over +150°C.
Rꢁꢂ232/Rꢁꢂ48ꢀ -rotocol Translator
Figure 18 shows the MAX3162E configured as an
RS-232/RS-485 protocol translator. The direction of
translation is controlled through the RTS signal (R1IN).
The single-ended RS-232 receiver input signal is trans-
lated to a differential RS-485 transmitter output.
Similarly, a differential RS-485 receiver input signal is
translated to a single-ended RS-232 transmitter output.
is transmitted as an RS-
485 signal on Z and Y. RS-485 signals received on A
and B are transmitted as an RS-232 signal on T1
-rotection Against Wiring Faults
EIA/TIA-485 standards require a common input voltage
range of -7k to +12k to prevent damage to the device.
RS-232 data received on R
2IN
.
OUT
±8 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
T
T
T
T
IN
IN
OUT
OUT
5V/div
5V/div
R
OUT
R
OUT
1µs/div
200ns/div
Figure 16. MAX3161E/MAX3162E RS-232 Loopback Test Result
at 1Mbps, FAST = High
Figure 15. MAX3161E/MAX3162E RS-232 Loopback Test Result
at 250kbps, FAST = Low
Multiprotocol Bus
Multiprotocol Bus Multiplexer
The Typical Application Circuit shows the MAX3161E
configured as a multiprotocol bus multiplexer. The
MAX3161E separates the RS-232 and RS-485 lines, but
shares the logic pins between modes. This application
allows the µP to monitor a point-to-point RS-232 bus, and
a multidrop RS-485 interface. The MAX3100 UART asyn-
chronously transfers data through the MAX3161E to the
pin-selected RS-232 or RS-485 protocol.
The Typical Operating Circuit shows a standard appli-
cation for the MAX3160E. The MAX3160E’s outputs are
multiplexed between RS-232 and RS-485 protocols by
a microprocessor (µP). The µP also directs the shut-
down functions, enable lines, and the duplex of the
MAX3160E. Data is transmitted to the MAX3100 UART
through an SPI™ port. The UART asynchronously
transfers data through the MAX3160E to the pin-select-
ed RS-232 or RS-485 protocal. See Table 14 for com-
monly used cable connections.
SPI is a registered trademark of Motorola, Inc.
______________________________________________________________________________________ ±9
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
3.3V
MAX3160E
MAX3161E
MAX3162E
C
BYPASS
100nF
A
B
120Ω
120Ω
RO
RE485
R
DATA IN
2
27
26
V
CC
1
3
C2+
C2-
C1+
C1-
C2
100nF
C1
100nF
DE485
MAX3162E
Z
13
5
DI
SHDN
D
DATA OUT
Y
24
RCV
T1OUT
T1IN
10
23
11
9
R2OUT
DI
RO
R1OUT
12
22
RE485
DE485
19
20
TX
R2IN
R1IN
NOTE: RE485 ON MAX3162E ONLY
17
RTS
A
18
6
15
16
14
28
Figure 17. RS-485 Line Repeater
RE232
TE232
B
Z
7
Y
FAST
V+
25
V-
GND
C3
100nF
C4
100nF
Figure 18. Protocol Translator
20 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Rꢁꢂ232 Transmitters Truth Tables
Rꢁꢂ232 Receivers Truth Tables
Table 4. ꢄAX3±60E
Table ±. ꢄAX3±60E
INPUTS
OUTPUTS
INPUTS
OUTPUTS
DI/T±IN,
DE485/T2IN
Z(ꢂ)/T±OUT,
Y(A)/T2OUT
RS-485/
RS-232
ꢂ/R±IN,
A/R2IN
R±OUT,
RO/R2OUT
RS-485/
RS-232
SHDN
SHDN
0
1
1
1
X
0
0
1
X
0
1
X
1/8-unit load
X
X
X
0
0
0
0
1
0
1
1
1
0
Inputs open
RS-485 mode
R1OUT
High-impedance,
X
1
X
RO/R2OUT in
RS-485 mode
Table 2. ꢄAX3±6±E
INPUTS
OUTPUTS
DI/T±IN,
DE485/T2IN
RS-485/
Table 5. ꢄAX3±6±E
SHDN
T±OUT, T2OUT
RS-232
INPUTS
OUTPUTS
0
1
1
1
X
0
0
1
X
0
1
X
High-impedance
R±OUT,
RO/R2OUT
RS-485/
RS-232
SHDN
R±IN, R2IN
1
0
X
X
X
0
0
0
0
1
0
1
High-impedance
1
Inputs open
R1OUT
High-impedance,
Table 3. ꢄAX3±62E
X
1
X
INPUTS
OUTPUTS
T±OUT, T2OUT
High-impedance
High-impedance
1
RO/R2OUT in
RS-485 mode
SHDN
TE232
T±IN,T2IN
0
X
1
X
0
1
X
X
0
Table 6. ꢄAX3±62E
1
1
1
0
INPUTS
OUTPUTS
RE232
SHDN
R±IN, R2IN
R±OUT, R2OUT
X
X
X
X
1
0
0
0
X
High-impedance
0
1
0
1
1
Inputs open
______________________________________________________________________________________ 2±
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Rꢁꢂ48ꢀ/Rꢁꢂ422 Drivers Truth Tables
Table 7. ꢄAX3±60E
INPUTS
RS-232
OUTPUTS
SHDN
RS-485/
DE485/T2IN
DI/T±IN
Z(ꢂ)/T±OUT
Y(A)/T2OUT
0
1
1
1
X
X
X
0
1
1
X
X
X
0
1
X
1/8-unit load
1/8-unit load
1
1
1
0
1/8-unit load
1/8-unit load
1
0
0
1
RS-232 mode
Table 8. ꢄAX3±6±E
INPUTS
RS-232
OUTPUTS
RS-485/
SHDN
DE485/T2IN
DI/T±IN
Z(ꢂ)
Y(A)
1/8-unit load
1/8-unit load
1/8-unit load
0
0
X
X
1
1
X
0
X
1
1
X
X
0
1
1
X
X
X
0
1
1/8-unit load
1/8-unit load
1/8-unit load
1
0
1
Table 9. ꢄAX3±62E
INPUTS
OUTPUTS
SHDN
DE485
DI
X
X
0
Z
Y
0
X
1
1
X
0
1
1
High-impedance
High-impedance
High-impedance
High-impedance
1
0
0
1
1
Rꢁꢂ48ꢀ/Rꢁꢂ422 Receivers Truth Tables
Table ±0. ꢄAX3±60E
INPUTS
OUTPUT
RS-232
RS-485/
SHDN
ꢁDPLX
(A - ꢂ)*
(Y - Z)*
RO/R2OUT
1
0
1
1
1
1
1
1
X
X
0
0
0
1
1
1
X
X
X
High-impedance up to k
CC
1
1
1
1
1
1
0
≥-50mk
X
1
≤-200mk
X
X
0
Floating
1
X
X
X
X
≥-50mk
≤-200mk
Floating
X
1
0
1
RS-232 mode
*Y and Z correspond to pins Y(A)/T2OUT and Z(B)/T1OUT. A and B correspond to pins A/R2IN and B/R1IN.
22 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Rꢁꢂ48ꢀ/Rꢁꢂ422 Receivers Truth Tables (continued)
Table ±±. ꢄAX3±6±E
INPUTS
OUTPUT
RS-485/RS-232
SHDN
ꢁDPLX
A - ꢂ
Y(A) - Z(ꢂ)
RO/R2OUT
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
X
X
0
0
0
1
1
1
X
X
X
High-impedance up to k
CC
≥-50mk
X
1
≤-200mk
X
X
0
Floating
1
X
X
X
X
≥-50mk
≤-200mk
Floating
X
1
0
1
RS-232 mode
Table ±3. Requireꢃ ꢄinimum Capacitance
Values
Table ±2. ꢄAX3±62E
INPUTS
OUTPUT
RE485
SHDN
A - ꢂ
X
RO
SUPPLY
VOLTAGE (V)
C2, C3, C4,
C± (µF)
C
(µF)
0
X
1
1
1
X
1
0
0
0
High-impedance
ꢂYPASS
X
High-impedance
+3.0 to +3.6
+4.5 to +5.5
+3.0 to +5.5
0.1
0.047
0.1
0.1
≥-50mk
≤-200mk
Inputs
1
0
1
0.33
0.47
______________________________________________________________________________________ 23
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
Table ±4. Cable Connections Commonly Useꢃ for EIA/TIA-232 anꢃ
V.24 Asynchronous Interfaces
ꢄAX3±60E
ꢄAX3±6±E
ꢄAX3±62E
PIN NUꢄꢂER
EIA/TIA-232
STANDARD
CONNECTOR
PIN
FUNCTION
(AS SEEN ꢂY DTE)
EQUIVALENT
ꢄAX3±60E
ꢄAX3±6±E
ꢄAX3±62E
DCD
RD
1
2
3
4
5
6
7
8
—
R2IN
T1OUT
—
—
13
5
—
17
5
—
19
5
Data carrier detect
Received data
TD
Transmitted data
DTR
SG
—
4
—
4
—
4
Data terminal ready
Signal ground
GND
—
DSR
RTS
CTS
—
6
—
8
—
8
Data set ready
T2OUT
R1IN
Request to send (= DTE ready)
Clear to send (= DCE ready)
14
18
20
RI
9
—
—
—
—
Ring indicator
Typical Application Circuit
+3.3V
2
14
DB9
V
HDPLX
CC
RS-232
T1OUT
5
TX
13
DI/T1IN
20
10
19
9
MAX3100
UART
RO/R2OUT
R2IN
17
RX
12
DE485/T2IN
RTS
11
T2OUT
8
MAX3161E
CTS
10
R1OUT
R1IN
18
1
RJ45
RS-485
Y(A)
7
SPI
Z(B)
RS-485/
RS-232
6
GND
FAST
12
SHDN
4
13
11
µP
RS-485/RS-232
SHDN
MULTIPROTOCOL BUS MULTIPLEXER
24 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
-in Configurations
TOP VIEW
C1+
1
2
3
4
5
6
7
8
9
24 V+
C1+
1
2
3
4
5
6
7
8
9
20 V+
C1+
1
2
3
4
5
6
7
8
9
28 V+
V
19 C2+
V
23 C2+
CC
CC
V
27 C2+
26 C2-
25 V-
CC
C1-
GND
22 C2-
C1-
GND
18 C2-
C1-
GND
T1OUT
Z
21 V-
17 V-
MAX3161E
MAX3160E
Z(B)/T1OUT
Y(A)/T2OUT
R1OUT
16 DI/T1IN
15 DE485/T2IN
T1OUT
Z(B)
20 DI/T1IN
19 DE485/T2IN
18 R1IN
17 R2IN
24 T1IN
23 DI
MAX3162E
14
Y(A)
B/R1IN
Y
22 DE485
21 T2IN
20 R1IN
19 R2IN
RO/R2OUT
SHDN
13 A/R2IN
T2OUT
R1OUT
T2OUT
R1OUT
12 HDPLX
16
15
B
A
FAST 10
11 RS-485/RS-232
RO/R2OUT 10
SHDN 11
R2OUT 10
RO 11
14 HDPLX
18
17
B
A
SSOP
FAST 12
13 RS-485/RS-232
RE485 12
SHDN 13
FAST 14
16 TE232
15 RE232
SSOP
SSOP
ꢁelector Guide
Chip Information
TRANSISTOR COUNT: 1805
PROCESS: CMOS
RS-485
FLOW-
DUAL
ꢄODE
INPUT
PART
TꢁROUGꢁ
PINOUT
UNIT
LOADS
MAX3160E
MAX3161E
MAX3162E
No
No
Yes
No
1/4
1/8
1/8
Yes
Yes
______________________________________________________________________________________ 25
1ꢀ5k EꢁDꢂ-rotected, +3.0k to +ꢀ.ꢀk, 10nA,
Rꢁꢂ232/Rꢁꢂ48ꢀ/Rꢁꢂ422 Multiprotocol Transceivers
-ac5age Information
2
1
INCHES
MILLIMETERS
DIM
A
MIN
0.068
MAX
MIN
1.73
0.05
0.25
0.09
MAX
1.99
0.21
0.38
0.20
INCHES
MIN
MAX
MILLIMETERS
MIN
6.07
6.07
7.07
8.07
MAX
6.33
N
0.078
A1
B
D
D
D
D
D
0.239 0.249
0.239 0.249
0.278 0.289
0.317 0.328
14L
0.002 0.008
0.010 0.015
0.004 0.008
6.33 16L
7.33
8.33 24L
20L
C
E
H
D
SEE VARIATIONS
0.205 0.212 5.20
0.0256 BSC
0.397 0.407 10.07 10.33 28L
E
5.38
e
0.65 BSC
H
0.301 0.311 7.65
0.025 0.037 0.63
7.90
0.95
8∞
L
0∞
8∞
0∞
N
A
C
B
L
e
A1
D
NOTES:
1. D&E DO NOT INCLUDE MOLD FLASH.
2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006").
3. CONTROLLING DIMENSION: MILLIMETERS.
4. MEETS JEDEC MO150.
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, SSOP, 5.3 MM
APPROVAL
DOCUMENT CONTROL NO.
REV.
5. LEADS TO BE COPLANAR WITHIN 0.10 MM.
1
21-0056
C
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
26 ____________________Maxim Integrated -roducts, 120 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademarꢀ of Maxim Integrated Products, Inc.
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