MAX3073EESD+ [MAXIM]
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO14, 0.150 INCH, MS-012AB, SOIC-14;
| 型号： | MAX3073EESD+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO14, 0.150 INCH, MS-012AB, SOIC-14 |
| 文件： | 总25页 (文件大小：499K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2668; Rev 1; 1/03
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
General Description
Features
The MAX3070E–MAX3079E 3.3V, ±±15V EꢀSD-proeꢁoeꢂ,
RꢀD481/RꢀD422 opansꢁeiveps feaoupe rne ꢂpivep anꢂ rne
peꢁeivep. These ꢂeviꢁes inꢁluꢂe failDsafe ꢁipꢁuiopy, guapD
anoeeing a lrgiꢁDhigh peꢁeivep ruo-uo when peꢁeivep
in-uos ape r-en rp shrpoeꢂ. The peꢁeivep ruo-uos a lrgiꢁ
high if all opansmiooeps rn a oepminaoeꢂ bus ape ꢂisableꢂ
(high im-eꢂanꢁe). The MAX3070E–MAX3079E inꢁluꢂe a
hroDswa- ꢁa-abilioy or eliminaoe false opansioirns rn ohe
bus ꢂuping -rwepDu- rp hro insepoirn.
ꢀ 3.3V Operation
ꢀ Electrostatic Discharge (ESD) Protection for
RS-485 I/O Pins
±±5ꢀV ꢁHuan ꢂoꢃd ꢄoꢃel
ꢀ TrHe Fail-Safe Receiver While ꢄaintaining
EIA/TIA-485 Coupatibilitd
ꢀ ꢁot-Swap InpHt StrHctHre on DE anꢃ RE
The MAX3070E/MAX307±E/MAX3072E feaoupe peꢂuꢁeꢂ
slewDpaoe ꢂpiveps ohao minimize EMI anꢂ peꢂuꢁe pefleꢁD
oirns ꢁauseꢂ by im-pr-eply oepminaoeꢂ ꢁables, allrwing
epprpDfpee ꢂaoa opansmissirn u- or 2105b-s. The
MAX3073E/MAX3074E/MAX3071E alsr feaoupe slewD
paoeDlimioeꢂ ꢂpiveps buo allrw opansmio s-eeꢂs u- or
1005b-s. The MAX3076E/MAX3077E/MAX3078E ꢂpivep
slew paoes ape nro limioeꢂ, ma5ing opansmio s-eeꢂs u- or
±6Mb-s -rssible. The MAX3079E slew paoe is -in
seleꢁoable frp 2105b-s, 1005b-s, anꢂ ±6Mb-s.
ꢀ Enhanceꢃ Slew-Rate Liuiting Facilitates Error-
Free Data Transuission
(ꢄAX3070E–ꢄAX3075E/ꢄAX3079E)
ꢀ Low-CHrrent ShHtꢃown ꢄoꢃe (Except
ꢄAX307±E/ꢄAX3074E/ꢄAX3077E)
ꢀ Pin-Selectable FHll-/ꢁalf-DHplex Operation
(ꢄAX3079E)
ꢀ Phase Controls to Correct for Twisteꢃ-Pair
Reversal (ꢄAX3079E)
The MAX3072E/MAX3071E/MAX3078E ape inoenꢂeꢂ frp
halfDꢂu-lex ꢁrmmuniꢁaoirns, anꢂ ohe MAX3070E/
MAX307±E/MAX3073E/MAX3074E/MAX3076E/MAX307
7E ape inoenꢂeꢂ frp fullDꢂu-lex ꢁrmmuniꢁaoirns. The
MAX3079E is seleꢁoable frp halfDꢂu-lex rp fullDꢂu-lex
r-epaoirn. Io alsr feaoupes inꢂe-enꢂenoly -prgpammable
peꢁeivep anꢂ opansmiooep ruo-uo -hase ohprugh
se-apaoe -ins.
ꢀ Allow Up to 256 Transceivers on the ꢂHs
ꢀ Available in InꢃHstrd-Stanꢃarꢃ 8-Pin SO Pacꢀage
Ordering Information
The MAX3070E–MAX3079E opansꢁeiveps ꢂpaw 800µA
rf su--ly ꢁuppeno when unlraꢂeꢂ rp when fully lraꢂeꢂ
wioh ohe ꢂpiveps ꢂisableꢂ. All ꢂeviꢁes have a ±/8Dunio
lraꢂ peꢁeivep in-uo im-eꢂanꢁe, allrwing u- or 216
opansꢁeiveps rn ohe bus.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 Plastic DIP
14 SO
MAX3070EEPD
MAX3070EESD
MAX3070EAPD
MAX3070EASD
MAX3071EEPA
MAX3071EESA
MAX3071EAPA
MAX3071EASA
-40°C to +125°C 14 Plastic DIP
-40°C to +125°C 14 SO
Applications
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
Lighoing ꢀysoems
Inꢂusopial Crnoprl
Teleꢁrm
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
ꢀeꢁupioy ꢀysoems
Insopumenoaoirn
Ordering Information continued at end of data sheet.
Selector Guide, Pin Configurations, and Typical Operating
Circuits appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
±
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND)
Continuous Power Dissipation (ꢁ = +70°C)
A
Supply Voltage (V ).............................................................+6V
Control Input Voltage (RE% DE% SLR%
H/F% ꢁXP% RXP)......................................................-0.3V to +6V
Driver Input Voltage (DI)...........................................-0.3V to +6V
Driver Output Voltage (Z% Y% A% B) .............................-8V to +13V
Receiver Input Voltage (A% B)....................................-8V to +13V
Receiver Input Voltage
8-Pin SO (derate 5.88ꢂW/°C above +70°C) .................471ꢂW
8-Pin Plastic DIP (derate 9.09ꢂW/°C above +70°C) .....727ꢂW
14-Pin SO (derate 8.33ꢂW/°C above +70°C) ...............667ꢂW
14-Pin Plastic DIP (derate 10.0ꢂW/°C above +70°C) ...800ꢂW
Operating ꢁeꢂperature Ranges
MAX307_EE_ _ ................................................-40°C to +85°C
MAX307_EA_ _ ..............................................-40°C to +125°C
Junction ꢁeꢂperature......................................................+150°C
Storage ꢁeꢂperature Range.............................-65°C to +150°C
Lead ꢁeꢂperature (soldering% 10s) .................................+300°C
CC
Full Duplex (A% B) ..................................................-8V to +13V
Receiver Output Voltage (RO)....................-0.3V to (V
+ 0.3V)
CC
Driver Output Current ..................................................... 250ꢂA
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.
DC ELECTRICAL CHARACTERISTICS
(V
= 3.3V 10ꢀ% ꢁ =ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V
= 3.3V and ꢁ = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
R = 100Ω (RS422)% Figure 1
2
V
V
V
L
CC
CC
CC
Differential Driver Output
V
V
R = 54Ω (RS485)% Figure 1
1.5
OD
L
No load
Change in Magnitude of
Differential Output Voltage
∆V
R = 100Ω or 54Ω% Figure 1 (Note 2)
0.2
3
V
V
V
OD
L
Driver Coꢂꢂon-Mode Output
Voltage
V
R = 100Ω or 54Ω% Figure 1
L
V
/ 2
CC
OC
Change in Magnitude of
Coꢂꢂon-Mode Voltage
∆V
R = 100Ω or 54Ω% Figure 1 (Note 2)
L
0.2
OC
Input High Voltage
Input Low Voltage
V
DE% DI% RE% ꢁXP% RXP% H/F
DE% DI% RE% ꢁXP% RXP% H/F
DE% DI% RE% ꢁXP% RXP% H/F
DE% DI% RE
2
V
V
IH
V
0.8
IL
Input Hysteresis
V
100
ꢂV
µA
kΩ
µA
V
HYS
IN1
Input Current
I
1
10
40
Input Iꢂpedance First ꢁransition
Input Current
DE
1
I
ꢁXP% RXP% H/F internal pulldown
10
IN2
SRL Input High Voltage
SRL Input Middle Voltage
SRL Input Low Voltage
V
- 0.4
CC
V
x 0.4
V
CC
x 0.6
0.4
V
CC
V
SRL = V
75
CC
SRL Input Current
µA
µA
SRL = GND
-75
V
V
= +12V
= -7V
125
IN
IN
Output Leakage (Y and Z)
Full Duplex
DE = GND%
I
O
V
= GND or 3.6V
CC
-100
2
_______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
= 3.3V 10ꢀ% ꢁ =ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V
= 3.3V and ꢁ = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
≤ 12V (Note 3)
MIN
40
TYP
MAX
250
-40
UNITS
0 ≤ V
OUꢁ
Driver Short-Circuit Output
Current
I
ꢂA
OSD
-7V ≤ V
≤ V
(Note 3)
-250
20
OUꢁ
CC
(V
CC
- 1V) ≤ V
≤ 12V (Note 3)
OUꢁ
Driver Short-Circuit Foldback
Output Current
I
ꢂA
OSDF
-7V ≤ V
≤ 1V (Note 3)
-20
OUꢁ
ꢁherꢂal-Shutdown ꢁhreshold
ꢁherꢂal-Shutdown Hysteresis
ꢁ
175
15
°C
°C
ꢁS
ꢁ
ꢁSH
V
V
= +12V
= -7V
125
DE = GND%
= GND or 3.6
IN
IN
Input Current (A and B)
I
µA
A% B
V
CC
-100
-200
RECEIVER
Receiver Differential ꢁhreshold
Voltage
V
-7V ≤ V
≤ 12V
CM
-125
15
-50
ꢂV
ꢁH
Receiver Input Hysteresis
RO Output High Voltage
RO Output Low Voltage
∆V
V
+ V = 0V
A B
ꢂV
V
ꢁH
V
I
I
= -1ꢂA
= 1ꢂA
O
V
- 0.6
CC
OH
O
V
0.4
1
V
OL
ꢁhree-State Output Current at
Receiver
I
0 ≤ V ≤ V
µA
kΩ
ꢂA
OZR
O
CC
Receiver Input Resistance
R
-7V ≤ V
≤ 12V
96
IN
CM
Receiver Output Short-Circuit
Current
I
0V ≤ V
≤ V
CC
80
OSR
RO
SUPPLY CURRENT
No load% RE = 0% DE = V
0.8
0.8
0.8
1.5
1.5
1.5
CC
Supply Current
I
ꢂA
µA
kV
No load% RE = V % DE = V
CC
CC
CC
No load% RE = 0% DE = 0
Supply Current in Shutdown
Mode
I
RE = V % DE = GND
0.05
10
SHDN
CC
ESD PROTECTION
ESD Protection for Y% Z% A% and B
Huꢂan Body Model
15
Note 1: All currents into the device are positive. All currents out of the device are negative. All voltages are referred to device
ground% unless otherwise noted.
Note 2: ∆V
and ∆V
are the changes in V
and V % respectively% when the DI input changes state.
OD
OC
OD OC
Note 3: ꢁhe short-circuit output current applies to peak current just prior to foldback current liꢂiting. ꢁhe short-circuit foldback out-
put current applies during current liꢂiting to allow a recovery froꢂ bus contention.
_______________________________________________________________________________________
3
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
DRIVER SWITCHING CHARACTERISTICS
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V = 3.3V and ꢁ = +25°C.)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
C = 50pF% R = 54Ω% Figures 2 and 3
MIN
250
250
TYP
MAX
1500
1500
UNITS
t
t
DPLH
DPHL
Driver Propagation Delay
ns
L
L
Driver Differential Output Rise or
Fall ꢁiꢂe
t
t
C = 50pF% R = 54Ω% Figures 2 and 3
350
1600
200
ns
ns
DR % DF
L
L
Differential Driver Output Skew
t
C = 50pF% R = 54Ω% Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maxiꢂuꢂ Data Rate
250
kbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable ꢁiꢂe froꢂ Low
Driver Disable ꢁiꢂe froꢂ High
t
Figure 4
Figure 5
Figure 5
Figure 4
2500
2500
100
DZH
t
t
ns
DZL
DLZ
DHZ
ns
t
100
ns
Driver Enable froꢂ Shutdown to
Output High
t
Figure 4
Figure 5
5500
ns
DZH(SHDN)
Driver Enable froꢂ Shutdown to
Output Low
t
5500
600
ns
ns
DZL(SHDN)
ꢁiꢂe to Shutdown
t
50
200
SHDN
RECEIVER SWITCHING CHARACTERISTICS
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V = 3.3V and ꢁ = +25°C.)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
C = 15pF% Figures 6 and 7
MIN
TYP
MAX
200
UNITS
t
t
RPLH
RPHL
Receiver Propagation Delay
ns
L
200
Receiver Output Skew
t
C = 15pF% Figures 6 and 7
L
30
ns
RSKEW
|t
- t
|
RPLH RPHL
Maxiꢂuꢂ Data Rate
250
kbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable ꢁiꢂe froꢂ Low
Receiver Disable ꢁiꢂe froꢂ High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
t
ns
RHZ
Receiver Enable froꢂ Shutdown
to Output High
t
Figure 8
Figure 8
4000
ns
RZH(SHDN)
Receiver Enable froꢂ Shutdown
to Output Low
t
4000
600
ns
ns
RZL(SHDN)
ꢁiꢂe to Shutdown
t
50
200
SHDN
4
_______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
DRIVER SWITCHING CHARACTERISTICS
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = V
(500kbps)
CC
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V
= 3.3V and ꢁ = +25°C.)
CC
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 50pF% R = 54Ω% Figures 2 and 3
MIN
180
180
TYP
MAX
800
UNITS
t
t
DPLH
DPHL
Driver Propagation Delay
ns
L
L
800
Driver Differential Output Rise or
Fall ꢁiꢂe
t
t
C = 50pF% R = 54Ω% Figures 2 and 3
200
800
100
ns
ns
DR % DF
L
L
Differential Driver Output Skew
t
C = 50pF% R = 54Ω% Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maxiꢂuꢂ Data Rate
500
kbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable ꢁiꢂe froꢂ Low
Driver Disable ꢁiꢂe froꢂ High
t
Figure 4
Figure 5
Figure 5
Figure 4
2500
2500
100
DZH
t
t
ns
DZL
DLZ
DHZ
ns
t
100
ns
Driver Enable froꢂ Shutdown to
Output High
t
Figure 4
Figure 5
4500
ns
DZH(SHDN)
Driver Enable froꢂ Shutdown to
Output Low
t
4500
600
ns
ns
DZL(SHDN)
ꢁiꢂe to Shutdown
t
50
200
SHDN
RECEIVER SWITCHING CHARACTERISTICS
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = V
(500kbps)
CC
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V
= 3.3V and ꢁ = +25°C.)
CC
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 15pF% Figures 6 and 7
MIN
TYP
MAX
200
UNITS
t
t
RPLH
RPHL
Receiver Propagation Delay
ns
L
200
Receiver Output Skew
t
C = 15pF% Figures 6 and 7
L
30
ns
RSKEW
|t
- t
|
RPLH RPHL
Maxiꢂuꢂ Data Rate
500
kbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable ꢁiꢂe froꢂ Low
Receiver Disable ꢁiꢂe froꢂ High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
t
ns
RHZ
Receiver Enable froꢂ Shutdown
to Output High
t
Figure 8
Figure 8
4000
ns
RZH(SHDN)
Receiver Enable froꢂ Shutdown
to Output Low
t
4000
600
ns
ns
RZL(SHDN)
ꢁiꢂe to Shutdown
t
50
200
SHDN
_______________________________________________________________________________________
5
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
DRIVER SWITCHING CHARACTERISTICS
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V = 3.3V and ꢁ = +25°C.)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
C = 50pF% R = 54Ω% Figures 2 and 3
MIN
TYP
MAX
50
UNITS
t
t
DPLH
DPHL
Driver Propagation Delay
ns
L
L
50
Driver Differential Output Rise or
Fall ꢁiꢂe
t
t
C = 50pF% R = 54Ω% Figures 2 and 3
15
8
ns
ns
DR % DF
L
L
Differential Driver Output Skew
t
C = 50pF% R = 54Ω% Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maxiꢂuꢂ Data Rate
16
Mbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable ꢁiꢂe froꢂ Low
Driver Disable ꢁiꢂe froꢂ High
t
Figure 4
Figure 5
Figure 5
Figure 4
150
150
100
100
DZH
t
t
ns
DZL
DLZ
DHZ
ns
t
ns
Driver Enable froꢂ Shutdown to
Output High
t
Figure 4
Figure 5
1250
1800
ns
DZH(SHDN)
Driver Enable froꢂ Shutdown to
Output Low
t
1250
200
1800
600
ns
ns
DZL(SHDN)
ꢁiꢂe to Shutdown
t
50
SHDN
RECEIVER SWITCHING CHARACTERISTICS
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(V
= 3.3V 10ꢀ% ꢁ = ꢁ
A
to ꢁ
% unless otherwise noted. ꢁypical values are at V = 3.3V and ꢁ = +25°C.)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
C = 15pF% Figures 6 and 7
MIN
TYP
40
MAX
75
UNITS
t
t
RPLH
RPHL
Receiver Propagation Delay
ns
L
40
75
Receiver Output Skew
t
C = 15pF% Figures 6 and 7
L
8
ns
RSKEW
|t
- t
|
RPLH RPHL
Maxiꢂuꢂ Data Rate
16
Mbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable ꢁiꢂe froꢂ Low
Receiver Disable ꢁiꢂe froꢂ High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
RHZ
t
ns
Receiver Enable froꢂ Shutdown
to Output High
t
Figure 8
Figure 8
1800
ns
RZH(SHDN)
Receiver Enable froꢂ Shutdown
to Output Low
t
1800
600
ns
ns
RZL(SHDN)
ꢁiꢂe to Shutdown
t
50
200
SHDN
6
_______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Typical Operating Characteristics
(V
= 3.3V% ꢁ = +25°C% unless otherwise noted.)
CC
A
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
1.0
30
25
20
15
10
5
35
30
25
20
15
10
5
0.9
0.8
0.7
0.6
0.5
DE = V
CC
DE = 0
0
0
-50 -25
0
25
50
75 100 125
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
TEMPERATURE (°C)
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
100
90
80
70
60
50
40
30
20
10
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3.30
3.25
3.20
3.15
3.10
3.05
3.00
I
= -1mA
O
I
= -1mA
O
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT LOW VOLTAGE
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
160
140
120
100
80
180
160
140
120
100
80
2.60
2.50
2.40
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
R = 54Ω
L
60
60
40
40
20
20
0
0
-7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
0
2
4
6
8
10
12
-50 -25
0
25
50
75 100 125
OUTPUT HIGH VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
_______________________________________________________________________________________
7
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Typical Operating Characteristics (continued)
(V
= 3.3V% ꢁ = +25°C% unless otherwise noted.)
CC
A
DRIVER PROPAGATION DELAY
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (500kbps)
vs. TEMPERATURE (250kbps)
SHUTDOWN CURRENT
vs. TEMPERATURE
500
450
400
350
300
250
200
1000
900
800
700
600
500
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
t
DPLH
t
DPLH
t
t
DPHL
DPHL
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps AND 500kbps)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
30
25
20
15
10
5
150
120
90
60
30
0
70
60
50
40
30
20
10
0
t
DPLH
t
DPLH
t
DPLH
t
DPHL
t
DPHL
t
DPHL
0
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY
(250kbps AND 500kbps)
DRIVER PROPAGATION DELAY (250kbps)
MAX3070E toc17
MAX3070E toc16
V
- V
B
A
DI
2V/div
1V/div
V
- V
Z
RO
2V/div
Y
2V/div
200ns/div
1µs/div
8
_______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Typical Operating Characteristics (continued)
(V
= 3.3V% ꢁ = +25°C% unless otherwise noted.)
A
CC
DRIVER PROPAGATION DELAY (500kbps)
DRIVER PROPAGATION DELAY (16Mbps)
RECEIVER PROPAGATION DELAY (16Mbps)
MAX3070E toc20
MAX3070E toc18
MAX3070E toc19
V
A
1V/div
DI
2V/div
DI
2V/div
V
B
1V/div
V
Z
1V/div
V
- V
Z
Y
2V/div
RO
2V/div
V
Y
1V/div
400ns/div
10ns/div
20ns/div
Test Circuits and Waveforms
3V
DE
Y
R /2
L
Y
V
OD
DI
R
C
L
V
L
OD
V
R /2
L
OC
Z
Z
Figure 1. Driver DC Test Load
Figure 2. Driver Timing Test Circuit
V
CC
DI
V
/2
CC
O
0
t
t
DPHL
1/2 V
DPLH
O
Z
V
Y
1/2 V
O
V
= V (Y) - V (Z)
DIFF
V
0
O
90%
90%
V
DIFF
10%
10%
-V
O
t
t
DF
DR
t
= | t
- t
|
SKEW
DPLH DPHL
Figure 3. Driver Propagation Delays
_______________________________________________________________________________________
9
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Test Circuits and Waveforms (continued)
S1
0 OR 3V
D
OUT
R = 500Ω
L
C
L
50pF
GENERATOR
50Ω
V
0
V
CC
DE
V
/ 2
CC
t
, t
DZH DZH(SHDN)
0.25V
OH
OUT
V
= (0 + V ) / 2
OH
OM
0
t
DHZ
Figure 4. Driver Enable and Disable Times (t
, t
, t
)
DHZ DZH DZH(SHDN)
V
CC
R = 500Ω
L
S1
0 OR 3V
D
OUT
C
L
50pF
GENERATOR
50Ω
V
0
CC
DE
V
CC
/ 2
t
, t
DZL DZL(SHDN)
t
DLZ
V
CC
V
= (V + V ) / 2
OL CC
OM
OUT
0.25V
V
OL
Figure 5. Driver Enable and Disable Times (t
, t
, t
)
DZL DLZ DLZ(SHDN)
10 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Test Circuits and Waveforms (continued)
A
+1V
-1V
B
RECEIVER
OUTPUT
B
A
t
RPLH
V
R
ATE
ID
V
OH
t
RPHL
1.5V
V
OL
RO
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Propagation Delays
S1
+1.5V
-1.5V
S3
V
CC
1kΩ
V
ID
C
L
15pF
S2
GENERATOR
50Ω
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
3V
3V
0
1.5V
RE
RE
0
t
, t
RZH RZH(SHDN)
t
, t
RZL RZL(SHDN)
V
V
CC
OH
RO
V
/ 2
OH
(V + V ) / 2
OL
CC
RO
V
0
OL
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
3V
3V
0
1.5V
1.5V
RE
RE
0
t
RHZ
t
RLZ
V
CC
V
0
OH
0.25V
RO
RO
0.25V
V
OL
Figure 8. Receiver Enable and Disable Times
______________________________________________________________________________________ 11
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-in Description
PIN
MAX3070E MAX3071E MAX3072E
MAX3073E MAX3074E MAX3075E
MAX3076E MAX3077E MAX3078E
MAX3079E
NAME
FUNCTION
HALF-
FULL-DUPLEX
DUPLEX
FULL-
DUPLEX DUPLEX
MODE
HALF-
DEVICES
DEVICES
MODE
Half-/Full-Duplex Select Pin. Connect H/F to V
for half-
CC
duplex ꢂode; connect to GND or leave unconnected for
full-duplex ꢂode.
—
—
—
1
1
H/F
Receiver Output. When RE is low and if (A - B) ≥ -50ꢂV%
RO is high; if (A - B) ≤ -200ꢂV% RO is low.
2
2
1
2
3
2
3
RO
Receiver Output Enable. Drive RE low to enable RO; RO is
high iꢂpedance when RE is high. Drive RE high and DE
low to enter low-power shutdown ꢂode. RE is a hot-swap
input (see the Hot-Swap Capability section for details).
3
4
—
—
2
3
RE
Driver Output Enable. Drive DE high to enable driver
outputs. ꢁhese outputs are high iꢂpedance when DE is
low. Drive RE high and DE low to enter low-power
shutdown ꢂode. DE is a hot-swap input (see the Hot-
Swap Capability section for details).
4
4
DE
Driver Input. With DE high% a low on DI forces noninverting
output low and inverting output high. Siꢂilarly% a high on DI
forces noninverting output high and inverting output low.
5
3
4
5
6
5
6
DI
Slew-Rate Liꢂit Selector Pin. Connect SRL to ground for
16Mbps coꢂꢂunication rate; connect to V
for 500kbps
CC
—
—
—
SRL
coꢂꢂunication rate. Leave unconnected for 250kbps
coꢂꢂunication rate.
6% 7
4
5
7
8
7
8
GND Ground
ꢁransꢂitter Phase. Connect ꢁXP to ground or leave
floating for norꢂal transꢂitter phase/polarity. Connect to
to invert the transꢂitter phase/polarity.
—
—
—
ꢁXP
V
CC
9
5
—
—
9
—
Y
Noninverting Driver Output
Noninverting Driver Output and Noninverting Receiver
Input*
—
—
—
9
Y
10
—
11
—
—
6
—
—
—
—
7
10
—
11
—
—
—
10
—
11
—
Z
Z
B
B
B
Inverting Driver Output
—
7
Inverting Driver Output and Inverting Receiver Input*
Inverting Receiver Input
—
—
Receiver Input Resistors*
Inverting Receiver Input and Inverting Driver Output
12 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-in Description (continued)
PIN
MAX3070E MAX3071E MAX3072E
MAX3073E MAX3074E MAX3075E
MAX3076E MAX3077E MAX3078E
MAX3079E
NAME
FUNCTION
HALF-
FULL-DUPLEX
DUPLEX
FULL-
DUPLEX DUPLEX
MODE
HALF-
DEVICES
DEVICES
MODE
12
8
—
—
12
—
A
A
Noninverting Receiver Input
—
—
—
12
Receiver Input Resistors*
Noninverting Receiver Input and Noninverting Driver
Output
—
—
6
—
—
A
Receiver Phase. Connect RXP to GND or leave
unconnected for norꢂal transꢂitter phase/polarity.
—
—
—
13
13
RXP
Connect to V to invert receiver phase/polarity.
CC
Positive Supply V = 3.3V 10ꢀ. Bypass V
CC
with a 0.1µF capacitor.
to GND
CC
14
1
8
14
14
V
CC
No Connect. Not internally connected. Can be connected
to GND.
1% 8% 13
—
—
—
—
N.C.
*MAX3079E only. In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) still have a
1/8-unit load, but are not connected to the receiver.
Function Tables
MAX3070E/MAX3073E/MAX3076E
MAX3071E/MAX3074E/MAX30767E
TRANSMITTING
TRANSMITTING
INPUT
OUTPUTS
INPUTS
OUTPUTS
DI
1
Z
0
1
Y
1
0
RE
X
DE
1
DI
1
Z
Y
0
1
1
0
0
X
1
0
0
0
X
X
High-Z
High-Z
RECEIVING
1
0
Shutdown
INPUTS
A% B
OUTPUT
RO
1
RECEIVING
≥ -50ꢂV
INPUTS
OUTPUT
≤ -200ꢂV
Open/shorted
0
RE
0
DE
X
A% B
RO
1
1
≥ -50ꢂV
≤ -200ꢂV
0
X
0
Open/
shorted
0
X
1
1
1
1
0
X
X
High-Z
Shutdown
______________________________________________________________________________________ 13
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Function Tables (continued)
MAX3072E/MAX3075E/MAX3078E
RECEIVING
TRANSMITTING
INPUTS
OUTPUTS
INPUTS
OUTPUTS
RE
0
DE
X
A-B
RO
1
RE
X
DE
1
DI
1
B/Z
A/Y
≥ -50ꢂV
≤ -200ꢂV
0
1
1
0
0
X
0
X
1
0
Open/
shorted
0
0
X
X
High-Z
High-Z
0
X
1
1
0
Shutdown
1
1
1
0
X
X
High-Z
Shutdown
MAX3079E
TRANSMITTING
INPUTS
OUTPUTS
ꢁXP
0
RE
DE
DI
Z
Y
X
X
X
X
0
1
1
1
1
1
0
0
1
0
1
0
X
X
0
1
0
1
0
1
1
0
0
1
1
X
High-Z
High-Z
X
Shutdown
RECEIVING
INPUTS
OUTPUTS
H/F
0
RXP
0
RE
0
0
0
0
0
0
0
0
0
0
0
0
1
1
DE
X
X
X
X
0
A% B
Y% Z
RO
> -50ꢂV
X
1
0
0
< -200ꢂV
X
0
0
1
> -50ꢂV
X
X
0
0
1
< -200ꢂV
1
1
0
X
X
X
X
> -50ꢂV
1
1
0
0
< -200ꢂV
0
1
1
0
> -50ꢂV
0
1
1
0
< -200ꢂV
1
0
0
X
0
Open/shorted
X
1
1
0
X
Open/shorted
1
0
1
X
0
Open/shorted
X
0
0
1
1
X
X
X
Open/shorted
X
X
X
X
1
X
X
High-Z
Shutdown
0
X = Don’t care; shutdown mode, driver and receiver outputs are high impedance.
14 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
than or equal to -200ꢂV% RO is logic low. In the case of
Detailed Description
a terꢂinated bus with all transꢂitters disabled% the
ꢁhe MAX3070E–MAX3079E high-speed transceivers for
receiver’s differential input voltage is pulled to 0V by
the terꢂination. With the receiver thresholds of the
MAX3070E faꢂily% this results in a logic high with a
50ꢂV ꢂiniꢂuꢂ noise ꢂargin. Unlike previous fail-safe
devices% the -50ꢂV to -200ꢂV threshold coꢂplies with
the 200ꢂV EIA/ꢁIA-485 standard.
RS-485/RS-422 coꢂꢂunication contain one driver and
one receiver. ꢁhese devices feature fail-safe circuitry%
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted% or when they are
connected to a terꢂinated transꢂission line with all dri-
vers disabled (see the Fail-Safe section). ꢁhe
MAX3070E/MAX3072E/MAX3073E/MAX3075E/
MAX3076E/MAX3078E/MAX3079E also feature a hot-
swap capability allowing line insertion without erro-
neous data transfer (see the Hot Swap Capability
section). ꢁhe MAX3070E/MAX3071E/MAX3072E feature
reduced slew-rate drivers that ꢂiniꢂize EMI and
reduce reflections caused by iꢂproperly terꢂinated
cables% allowing error-free data transꢂission up to
250kbps. ꢁhe MAX3073E/MAX3074E/MAX3075E also
offer slew-rate liꢂits allowing transꢂit speeds up to
500kbps. ꢁhe MAX3076E/MAX3077E/MAX3078Es’ dri-
ver slew rates are not liꢂited% ꢂaking transꢂit speeds
up to 16Mbps possible. ꢁhe MAX3079E’s slew rate is
selectable between 250kbps% 500kbps% and 16Mbps
by driving a selector pin with a three-state driver.
Hotꢁꢀwap Capability
(Except MAX307±E/MAX3074E/MAX3077E)
Hot-Swap Inputs
When circuit boards are inserted into a hot% or pow-
ered% backplane% differential disturbances to the data
bus can lead to data errors. Upon initial circuit board
insertion% the data coꢂꢂunication processor under-
goes its own power-up sequence. During this period%
the processor’s logic-output drivers are high iꢂped-
ance and are unable to drive the DE and RE inputs of
these devices to a defined logic level. Leakage cur-
rents up to 10µA froꢂ the high-iꢂpedance state of the
processor’s logic drivers could cause standard CMOS
enable inputs of a transceiver to drift to an incorrect
logic level. Additionally% parasitic circuit board capaci-
ꢁhe MAX3072E/MAX3075E/MAX3078E are half-duplex
transceivers% while the MAX3070E/MAX3071E/
MAX3073E/MAX3074E/MAX3076E/MAX3077E are full-
duplex transceivers. ꢁhe MAX3079E is selectable
between half- and full-duplex coꢂꢂunication by driving
a selector pin (SRL) high or low% respectively.
tance could cause coupling of V
or GND to the
CC
enable inputs. Without the hot-swap capability% these
factors could iꢂproperly enable the transceiver’s driver
or receiver.
When V
rises% an internal pulldown circuit holds DE
CC
low and RE high. After the initial power-up sequence%
the pulldown circuit becoꢂes transparent% resetting the
hot-swap tolerable input.
All devices operate froꢂ a single 3.3V supply. Drivers are
output short-circuit current liꢂited. ꢁherꢂal-shutdown cir-
cuitry protects drivers against excessive power dissipa-
tion. When activated% the therꢂal-shutdown circuitry
places the driver outputs into a high-iꢂpedance state.
Hot-Swap Input Circuitry
ꢁhe enable inputs feature hot-swap capability. At the
input there are two NMOS devices% M1 and M2
Receiver Input Filtering
ꢁhe receivers of the MAX3070E–MAX3075E% and the
MAX3079E when operating in 250kbps or 500kbps
ꢂode% incorporate input filtering in addition to input
hysteresis. ꢁhis filtering enhances noise iꢂꢂunity with
differential signals that have very slow rise and fall
tiꢂes. Receiver propagation delay increases by 25ꢀ
due to this filtering.
(Figure 9). When V
raꢂps froꢂ zero% an internal 10µs
CC
tiꢂer turns on M2 and sets the SR latch% which also
turns on M1. ꢁransistors M2% a 500µA current sink% and
M1% a 100µA current sink% pull DE to GND through a
5kΩ resistor. M2 is designed to pull DE to the disabled
state against an external parasitic capacitance up to
100pF that can drive DE high. After 10µs% the tiꢂer
deactivates M2 while M1 reꢂains on% holding DE low
against three-state leakages that can drive DE high. M1
reꢂains on until an external source overcoꢂes the
required input current. At this tiꢂe% the SR latch resets
and M1 turns off. When M1 turns off% DE reverts to a
Failꢁꢀafe
ꢁhe MAX3070E faꢂily guarantees a logic-high receiver
output when the receiver inputs are shorted or open% or
when they are connected to a terꢂinated transꢂission
line with all drivers disabled. ꢁhis is done by setting the
receiver input threshold between -50ꢂV and -200ꢂV. If
the differential receiver input voltage (A - B) is greater
than or equal to -50ꢂV% RO is logic high. If A - B is less
standard% high-iꢂpedance CMOS input. Whenever V
drops below 1V% the hot-swap input is reset.
CC
For RE there is a coꢂpleꢂentary circuit eꢂploying two
PMOS devices pulling RE to V
.
CC
______________________________________________________________________________________ 15
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
operation. Drive H/F high for half-duplex operation. In
full-duplex ꢂode% the pin configuration of the driver and
receiver is the saꢂe as that of a MAX3070E. In half-
duplex ꢂode% the receiver inputs are switched to the
driver outputs% connecting outputs Y and Z to inputs A
and B% respectively. In half-duplex ꢂode% the internal
full-duplex receiver input resistors are still connected to
pins 11 and 12.
V
CC
10µs
TIMER
SR LATCH
TIMER
±±15V EꢀD -rotection
As with all Maxiꢂ devices% ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
asseꢂbly. ꢁhe driver outputs and receiver inputs of the
MAX3070E faꢂily of devices have extra protection
against static electricity. Maxiꢂ’s engineers have devel-
oped state-of-the-art structures to protect these pins
against ESD of 15kV without daꢂage. ꢁhe ESD struc-
tures withstand high ESD in all states: norꢂal operation%
shutdown% and powered down. After an ESD event% the
MAX3070E–MAX3079E keep working without latchup or
daꢂage.
5kΩ
DE
DE
(HOT SWAP)
100µA
500µA
M1
M2
ESD protection can be tested in various ways. ꢁhe
transꢂitter outputs and receiver inputs of the
MAX3070E–MAX3079E are characterized for protection
to the following liꢂits:
Figure 9. Simplified Structure of the Driver Enable Pin (DE)
•
15kV using the Huꢂan Body Model
MAX3079E -rogramming
ꢁhe MAX3079E has several prograꢂꢂable operating
ꢂodes. ꢁransꢂitter rise and fall tiꢂes are prograꢂꢂa-
ble% resulting in ꢂaxiꢂuꢂ data rates of 250kbps%
500kbps% and 16Mbps. ꢁo select the desired data rate%
drive SRL to one of three possible states by using a
•
6kV using the Contact Discharge ꢂethod specified
in IEC 1000-4-2
ESD Test Conditions
ESD perforꢂance depends on a variety of conditions.
Contact Maxiꢂ for a reliability report that docuꢂents
test setup% test ꢂethodology% and test results.
three-state driver: V % GND% or unconnected. For
CC
250kbps operation% set the three-state device in high-
iꢂpedance ꢂode or leave SRL unconnected. For
Human Body Model
Figure 10a shows the Huꢂan Body Model% and Figure
10b shows the current waveforꢂ it generates when dis-
charged into a low iꢂpedance. ꢁhis ꢂodel consists of a
100pF capacitor charged to the ESD voltage of interest%
which is then discharged into the test device through a
1.5kΩ resistor.
500kbps operation% drive SRL high or connect it to V
.
CC
For 16Mbps operation% drive SRL low or connect it to
GND. SRL can be changed during operation without
interrupting data coꢂꢂunications.
Occasionally% twisted-pair lines are connected backward
froꢂ norꢂal orientation. ꢁhe MAX3079E has two pins that
invert the phase of the driver and the receiver to correct
this probleꢂ. For norꢂal operation% drive ꢁXP and RXP
low% connect theꢂ to ground% or leave theꢂ unconnect-
ed (internal pulldown). ꢁo invert the driver phase% drive
IEC 1000-4-2
ꢁhe IEC 1000-4-2 standard covers ESD testing and
perforꢂance of finished equipꢂent. However% it does
not specifically refer to integrated circuits. ꢁhe
MAX3070E faꢂily of devices helps you design equip-
ꢂent to ꢂeet IEC 1000-4-2% without the need for addi-
tional ESD-protection coꢂponents.
ꢁXP high or connect it to V . ꢁo invert the receiver
CC
phase% drive RXP high or connect it to V . Note that the
CC
receiver threshold is positive when RXP is high.
ꢁhe MAX3079E can operate in full- or half-duplex
ꢂode. Drive the H/F pin low% leave it unconnected
(internal pulldown)% or connect it to GND for full-duplex
ꢁhe ꢂajor difference between tests done using the
Huꢂan Body Model and IEC 1000-4-2 is higher peak
16 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
R
R
D
1500Ω
C
1MΩ
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I 100%
P
I
r
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
AMPS
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
36.8%
C
STORAGE
CAPACITOR
s
100pF
10%
0
SOURCE
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 10a. Human Body ESD Test Model
Figure 10b. Human Body Current Waveform
I
R
R
C
D
50MΩ TO 100MΩ
330Ω
100%
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
10%
t = 0.7ns TO 1ns
r
t
30ns
60ns
Figure 10c. IEC 1000-4-2 ESD Test Model
Figure 10d. IEC 1000-4-2 ESD Generator Current Waveform
current in IEC 1000-4-2% because series resistance is
lower in the IEC 1000-4-2 ꢂodel. Hence% the ESD with-
stand voltage ꢂeasured to IEC 1000-4-2 is generally
lower than that ꢂeasured using the Huꢂan Body Model.
Figure 10c shows the IEC 1000-4-2 ꢂodel% and Figure
10d shows the current waveforꢂ for IEC 1000-4-2 ESD
Contact Discharge test.
Applications Information
216 Transceivers on the Bus
ꢁhe standard RS-485 receiver input iꢂpedance is 12kΩ
(1-unit load)% and the standard driver can drive up to 32-
unit loads. ꢁhe MAX3070E faꢂily of transceivers has a
1/8-unit load receiver input iꢂpedance (96kΩ)% allowing
up to 256 transceivers to be connected in parallel on one
coꢂꢂunication line. Any coꢂbination of these devices
as well as other RS-485 transceivers with a total of 32-
unit loads or fewer can be connected to the line.
ꢁhe air-gap test involves approaching the device with a
charged probe. ꢁhe contact-discharge ꢂethod connects
the probe to the device before the probe is energized.
Machine Model
ꢁhe ꢂachine ꢂodel for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. ꢁhe objective is to eꢂulate the stress caused
when I/O pins are contacted by handling equipꢂent
during test and asseꢂbly. Of course% all pins require
this protection% not just RS-485 inputs and outputs.
Reduced EMI and Reflections
ꢁhe MAX3070E/MAX3071E/MAX3072E feature reduced
slew-rate drivers that ꢂiniꢂize EMI and reduce reflec-
tions caused by iꢂproperly terꢂinated cables% allowing
error-free data transꢂission up to 250kbps. ꢁhe
MAX3073E/MAX3074E/MAX3075E offer higher driver
output slew-rate liꢂits% allowing transꢂit speeds up to
500kbps. ꢁhe MAX3079E with SRL = V
or uncon-
CC
nected% are slew-rate liꢂited. With SRL unconnected%
the MAX3079E error-free data transꢂission is up to
250kbps; with SRL connected to V
speeds up to 500kbps.
the data transꢂit
CC
______________________________________________________________________________________ 17
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Lowꢁ-ower ꢀhutdown Mode (Except
MAX307±E/MAX3074E/MAX3077E)
Driver Output -rotection
ꢁwo ꢂechanisꢂs prevent excessive output current and
power dissipation caused by faults or by bus contention.
ꢁhe first% a foldback current liꢂit on the output stage%
provides iꢂꢂediate protection against short circuits over
the whole coꢂꢂon-ꢂode voltage range (see the Typical
Operating Characteristics). ꢁhe second% a therꢂal-shut-
down circuit% forces the driver outputs into a high-iꢂped-
ance state if the die teꢂperature becoꢂes excessive.
Low-power shutdown ꢂode is initiated by bringing both
RE high and DE low. In shutdown% the devices typically
draw only 50nA of supply current.
RE and DE can be driven siꢂultaneously; the parts are
guaranteed not to enter shutdown if RE is high and DE
is low for less than 50ns. If the inputs are in this state
for at least 600ns% the parts are guaranteed to enter
shutdown.
Line Length
ꢁhe RS-485/RS-422 standard covers line lengths up to
4000ft. For line lengths greater than 4000ft% use the
repeater application shown in Figure 11.
Enable tiꢂes t
and t
(see the Switching
ZL
ZH
Characteristics section) assuꢂe the part was not in a
low-power shutdown state. Enable tiꢂes t and
ZH(SHDN)
t
assuꢂe the parts were shut down. It takes
ZL(SHDN)
Typical Applications
ꢁhe MAX3072E/MAX3075E/MAX3078E/MAX3079E
transceivers are designed for bidirectional data coꢂꢂu-
nications on ꢂultipoint bus transꢂission lines. Figures
12 and 13 show typical network applications circuits.
drivers and receivers longer to becoꢂe enabled froꢂ
low-power shutdown ꢂode (t
% t
) than
ZH(SHDN) ZL(SHDN)
froꢂ driver/receiver-disable ꢂode (t % t ).
ZH ZL
ꢁo ꢂiniꢂize reflections% terꢂinate the line at both ends
in its characteristic iꢂpedance% and keep stub lengths
off the ꢂain line as short as possible. ꢁhe slew-rate-liꢂ-
ited MAX3072E/MAX3075E and the two ꢂodes of the
MAX3079E are ꢂore tolerant of iꢂperfect terꢂination.
MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/
MAX3079E (FULL-DUPLEX)
A
RO
RE
DATA IN
R
B
120Ω
DE
Chip Information
ꢁRANSISꢁOR COUNꢁ: 1228
Z
DI
DATA OUT
D
Y 120Ω
PROCESS: BiCMOS
Figure 11. Line Repeater for MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/MAX3079E in Full-Duplex
Mode
120Ω
120Ω
DE
B
B
DI
D
D
DI
DE
A
B
A
B
A
A
RO
RE
RO
RE
R
R
R
R
D
D
MAX3072E
MAX3075E
MAX3078E
DE
DI
DI
RO
DE RO
RE
RE
MAX3079E (HALF-DUPLEX)
Figure 12. Typical Half-Duplex RS-485 Network
18 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
A
B
Y
120Ω
120Ω
R
RO
RE
DE
D
DI
Z
DE
RE
RO
Z
B
120Ω
120Ω
D
DI
R
Y
A
Y
Z
B
A
Y
Z
B
A
MAX3070E
MAX3071E
MAX3073E
MAX3074E
MAX3076E
MAX3077E
R
R
D
D
DI
DI
DE
DE
RE RO
RE RO
MAX3079E (FULL-DUPLEX)
NOTE: RE AND DE ON MAX3070E/MAX3073E/MAX3076E/MAX3079E ONLY.
Figure 13. Typical Full-Duplex RS-485 Network
ꢀelector Guide
RECEIVER/
DRIVER
ENABLE
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE LOW-POWER
TRANSCEIVERS
PINS
PART
LIMITED
SHUTDOWN
ON BUS
MAX3070E
MAX3071E
MAX3072E
MAX3073E
MAX3074E
MAX3075E
MAX3076E
MAX3077E
MAX3078E
MAX3079E
Full
Full
0.250
0.250
0.250
0.5
Yes
Yes
Yes
No
Yes
No
256
256
256
256
256
256
256
256
256
256
14
8
Half
Yes
Yes
Yes
No
Yes
Yes
No
8
Full
Yes
14
8
Full
0.5
Yes
Half
0.5
Yes
Yes
Yes
No
Yes
Yes
No
8
Full
16
No
14
8
Full
16
No
Half
16
No
Yes
Yes
Yes
Yes
8
Selectable
Selectable
Selectable
14
______________________________________________________________________________________ 19
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-in Configurations and Typical Operating Circuits
V
CC
MAX3070E
MAX3073E
MAX3076E
DE
V
CC RE
0.1µF
14
4
N.C.
RO
V
CC
1
2
3
4
5
6
7
14
13
12
11
10
9
Y
9
5
Rt
D
RO
DI
DI
R
N.C.
A
R
10
12
Z
RE
A
DE
B
2
Rt
D
RO
R
11
DI
Z
B
D
1, 8, 13
Y
N.C.
GND
GND
GND
3
6, 7
N.C.
8
GND DE
RE
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
DIP/SO
0.1µF
MAX3071E
MAX3074E
MAX3077E
V
CC
V
CC
1
V
A
B
Z
Y
CC
1
2
3
4
8
7
6
5
Y
5
6
8
R
3
2
Rt
RO
DI
D
RO
DI
R
Z
D
A
GND
Rt
DI
D
RO
R
7
B
DIP/SO
GND
4
GND
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
MAX3072E
MAX3075E
MAX3078E
0.1µF
DE
1
8
DI
V
CC
RO
RE
DE
DI
RO
RE
DE
DI
V
1
2
3
4
8
7
6
5
R
R
D
CC
2
3
4
7
A
B
A
B
B
A
Rt
Rt
6
5
RO
D
D
R
GND
GND
RE
DIP/SO
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORMS DIAGRAMS.
REFER TO PINS A AND B WHEN DE IS HIGH.
20 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-in Configurations and Typical Operating Circuits (continued)
V
RE
CC
MAX3079E
A
B
RO
TOP VIEW
H/F
RO
1
2
3
4
5
6
7
14
13
12
11
10
9
V
CC
RXP
RXP
A
RE
DE
B
MAX3079E
H/F
Z
DI
Z
TXP
SRL
GND
Y
TXP
8
Y
DIP/SO
DI
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND.
GND DE SRL
______________________________________________________________________________________ 21
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
Ordering Information (continued)
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 Plastic DIP
14 SO
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX3076EEPD
MAX3076EESD
MAX3076EAPD
MAX3076EASD
MAX3077EEPA
MAX3077EESA
MAX3077EAPA
MAX3077EASA
MAX3078EEPA
MAX3078EESA
MAX3078EAPA
MAX3078EASA
MAX3079EEPD
MAX3079EESD
MAX3079EAPD
MAX3079EASD
MAX3072EEPA
MAX3072EESA
MAX3072EAPA
MAX3072EASA
MAX3073EEPD
MAX3073EESD
MAX3073EAPD
MAX3073EASD
MAX3074EEPA
MAX3074EESA
MAX3074EAPA
MAX3074EASA
MAX3075EEPA
MAX3075EESA
MAX3075EAPA
MAX3075EASA
-40°C to +125°C 14 Plastic DIP
-40°C to +125°C 14 SO
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +85°C
-40°C to +85°C
14 Plastic DIP
14 SO
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
-40°C to +125°C 14 Plastic DIP
-40°C to +125°C 14 SO
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
-40°C to +85°C
-40°C to +85°C
14 Plastic DIP
14 SO
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +125°C 14 Plastic DIP
-40°C to +125°C 14 SO
-40°C to +125°C 8 Plastic DIP
-40°C to +125°C 8 SO
22 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-ac5age Information
(ꢁhe package drawing(s) in this data sheet ꢂay not reflect the ꢂost current specifications. For the latest package outline inforꢂation%
go to www.maxim-ic.com/packages.)
______________________________________________________________________________________ 23
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-ac5age Information (continued)
(ꢁhe package drawing(s) in this data sheet ꢂay not reflect the ꢂost current specifications. For the latest package outline inforꢂation%
go to www.maxim-ic.com/packages.)
24 ______________________________________________________________________________________
+3.3V, ±±15V EꢀDꢁ-rotected, Failꢁꢀafe,
Hotꢁꢀwap, Rꢀꢁ481/Rꢀꢁ422 Transceivers
-ac5age Information (continued)
(ꢁhe package drawing(s) in this data sheet ꢂay not reflect the ꢂost current specifications. For the latest package outline inforꢂation%
go to www.maxim-ic.com/packages.)
INCHES
MILLIMETERS
DIM
A
MIN
MAX
0.069
0.010
0.019
0.010
MIN
1.35
0.10
0.35
0.19
MAX
1.75
0.25
0.49
0.25
0.053
0.004
0.014
0.007
N
A1
B
C
e
0.050 BSC
1.27 BSC
E
0.150
0.228
0.016
0.157
0.244
0.050
3.80
5.80
0.40
4.00
6.20
1.27
E
H
H
L
VARIATIONS:
INCHES
1
MILLIMETERS
DIM
D
MIN
MAX
0.197
0.344
0.394
MIN
4.80
8.55
9.80
MAX
5.00
N
8
MS012
AA
TOP VIEW
0.189
0.337
0.386
D
8.75 14
10.00 16
AB
D
AC
D
C
A
B
0 -8
e
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0041
B
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.
Maxim Integrated -roducts, ±20 ꢀan Gabriel Drive, ꢀunnyvale, CA 94086 408ꢁ737ꢁ7600 ____________________ 25
© 2003 Maxiꢂ Integrated Products
Printed USA
is a registered tradeꢂark of Maxiꢂ Integrated Products.
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