MAX3224 [MAXIM]
1レA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus; 1μA电源电流，为1Mbps ， 3.0V至5.5V ， RS - 232收发器，具有自动关机加
| 型号： | MAX3224 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1レA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus |
| 文件： | 总20页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1289; Rev 1; 3/98
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 1µA Supply Current
The MAX3224–MAX3227/MAX3244/MAX3245 are 3V-
powered EIA/TIA-232 and V.28/V.24 communications
interfaces with automatic shutdown/wakeup features
and high data-rate capabilities.
♦ AutoShutdown Plus—EDN Innovation of the Year
♦ Guaranteed Data Rate:
All devices achieve a 1µA supply current using Maxim’s
re volutiona ry AutoShutd own Plus ™ fe a ture . The s e
d e vic e s a utoma tic a lly e nte r a low-p owe r s hutd own
mode when the RS-232 cable is disconnected or the
transmitters of the connected peripherals are inactive,
and the UART driving the transmitter inputs is inactive
for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiv-
e r inp ut. AutoShutd own Plus s a ve s p owe r without
changes to the existing BIOS or operating system.
250kbps (MAX3224/3226/3244)
1Mbps (MAX3225/3227/3245)
♦ Guaranteed Slew Rate:
6V/µs (MAX3224/3226/3244)
24V/µs (MAX3225/3227/3245)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed Mouse Driveability (MAX3244/3245)
♦ Ready-to-Transmit Logic-Level Output
The MAX3225/MAX3227/MAX3245 a ls o fe a ture
MegaBaud™ operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224/MAX3226/MAX3244 guarantee
250kbps operation. The transceivers have a proprietary
low-dropout transmitter output stage enabling true RS-
232 performance from a +3.0V to +5.5V supply with a
dual charge pump. The charge pump requires only four
small 0.1µF capacitors for operation from a 3.3V supply.
The MAX3224–MAX3227 feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing and the device is ready to begin transmitting.
_______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 SSOP
MAX3224CPP
MAX3224CAP
MAX3224EPP
MAX3224EAP
MAX3225CPP
MAX3225CAP
MAX3225EPP
MAX3225EAP
20 Plastic DIP
20 SSOP
20 Plastic DIP
20 SSOP
All devices are available in a space-saving SSOP pack-
age.
20 Plastic DIP
20 SSOP
________________________Ap p lic a t io n s
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Ordering Information continued at end of data sheet.
_____________________ S e le c t o r Gu id e
Battery-Powered Equipment
Hand-Held Equipment
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
AUTO-
SHUTDOWN
PLUS
READY
OUTPUT
PART
Peripherals
Printers
✔
✔
✔
✔
—
—
✔
✔
✔
✔
✔
✔
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
2/2
2/2
1/1
1/1
3/5
3/5
250k
1M
250k
1M
250k
1M
AutoShutdownPlus and MegaBaud are trademarks of Maxim Integrated Products.
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND..............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
V+ to GND (Note 1)..................................................-0.3V to +7V
V- to GND (Note 1) ...................................................+0.3V to -7V
V+ + V- (Note 1) ................................................................+13V
Input Voltages
T_IN, FORCEON, FORCEOFF to GND................ -0.3V to +6V
R_IN to GND ....................................................................±25V
Output Voltages
16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)........... 1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
Operating Temperature Ranges
MAX32_ _C_ _....................................................0°C to +70°C
MAX32_ _E_ _..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
T_OUT to GND.............................................................±13.2V
R_OUT, INVALID, READY to GND .........-0.3V to (V + 0.3V)
CC
Short-Circuit Duration
T_OUT to GND .......................................................Continuous
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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 CHARACTERISTICS
(V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T = T
CC
to T
,
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V = 3.3V or 5.0V, T = +25°C)
CC
A
Supply Current,
AutoShutdown Plus
FORCEON = GND, FORCEOFF = V
all R_IN idle, all T_IN idle
,
CC
1
1
10
10
1
µA
µA
Supply Current, Shutdown
FORCEOFF = GND
Supply Current,
AutoShutdown Plus Disabled
0.3
mA
FORCEON = FORCEOFF = V , no load
CC
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
0.8
V
V
T_IN, FORCEON, FORCEOFF
V
CC
= 3.3V
= 5.0V
2
T_IN, FORCEON,
Input Logic Threshold High
FORCEOFF
V
CC
2.4
Transmitter Input Hysteresis
Input Leakage Current
0.5
V
–7/MAX3245
±0.01
±1
±10
0.4
µA
T_IN, FORCEON, FORCEOFF
R_OUT (MAX3244/MAX3245), receivers
disabled
Output Leakage Current
±0.05
µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
I
= 1.6mA
= -1.0mA
V
V
OUT
I
V
- 0.6 V - 0.1
CC CC
OUT
-25
0.6
0.8
+25
V
V
V
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.2
1.5
1.5
1.8
0.5
5
CC
Input Threshold Low
Input Threshold High
T
= +25°C
= +25°C
A
V
CC
V
CC
2.4
2.4
T
A
V
V
CC
Input Hysteresis
Input Resistance
V
T
A
= +25°C
3
7
kΩ
2
_______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
ELECTRICAL CHARACTERISTICS (continued)
(V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T = T
to T
,
CC
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TRANSMITTER OUTPUTS
All transmitter outputs loaded with 3kΩ to
ground
Output Voltage Swing
±5
±5.4
10M
V
Output Resistance
V
CC
= V+ = V- = 0, transmitter outputs = ±2V
300
Ω
Output Short-Circuit Current
±60
±25
mA
V
= 0 or 3V to 5.5V, V
= ±12V,
CC
OUT
Output Leakage Current
µA
Transmitters disabled
MOUSE DRIVEABILITY (MAX3244/MAX3245)
T1IN = T2IN = GND, T3IN = V
,
CC
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with
2.5mA each
Transmitter Output Voltage
±5
V
AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = V
)
CC
Positive threshold
Negative threshold
2.7
Receiver Input Threshold to
INVALID Output High
Figure 4a
Figure 4a
V
V
-2.7
-0.3
Receiver Input Threshold to
INVALID Output Low
0.3
0.4
INVALID, READY
(MAX3224–MAX3227)
Output Voltage Low
I
= -1.6mA
V
V
OUT
INVALID, READY
(MAX3224–MAX3227)
I
= -1.0mA
V
- 0.6
OUT
CC
Output Voltage High
Receiver Positive or Negative
Threshold to INVALID High
t
V
= 5V, Figure 4b
= 5V, Figure 4b
CC
1
µs
µs
INVH
CC
Receiver Positive or Negative
Threshold to INVALID Low
t
V
30
INVL
Receiver or Transmitter Edge to
Transmitters Enabled
t
V
= 5V, Figure 5b (Note 2)
= 5V, Figure 5b (Note 2)
100
30
µs
WU
CC
Receiver or Transmitter Edge to
Transmitters Shutdown
tAUTOSHDN
V
CC
15
60
sec
_______________________________________________________________________________________
3
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
TIMING CHARACTERISTICS—MAX3224/MAX3226/MAX3244
(V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T = T
to T
,
CC
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
= 3kΩ, C = 1000pF,
MIN
TYP
MAX
UNITS
R
L
L
Maximum Data Rate
250
kbps
one transmitter switching
t
t
0.15
0.15
200
200
100
50
PHL
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
µs
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3244 only)
Normal operation (MAX3244 only)
(Note 3)
ns
ns
ns
ns
t
t
- t
PHL PLH
- t
Receiver Skew
PHL PLH
C
= 150pF
L
V
= 3.3V, T = +25°C,
A
= 3kΩ to 7kΩ,
CC
6
4
30
30
to 1000pF
R
L
Transition-Region Slew Rate
V/µs
measured from +3V to -3V
or -3V to +3V
C
= 150pF
L
to 2500pF
TIMING CHARACTERISTICS—MAX3225/MAX3227/MAX3245
(V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T = T
to T
,
CC
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R
= 3kΩ, C = 1000pF,
L
L
250
one transmitter switching
V
= 3.0V to 4.5V, R = 3kΩ,
= 250pF, one transmitter switching
CC
L
Maximum Data Rate
1000
1000
kbps
C
L
V
= 4.5V to 5.5V, R = 3kΩ,
L
= 1000pF, one transmitter switching
CC
C
L
t
t
0.15
0.15
200
200
25
PHL
PLH
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
µs
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3245 only)
Normal operation (MAX3245 only)
(Note 3)
ns
ns
ns
ns
t
t
- t
PHL PLH
–7/MAX3245
- t
Receiver Skew
50
PHL PLH
V
CC
= 3.3V, T = +25°C,
A
Transition-Region Slew Rate
R
L
= 3kΩ to 7kΩ, C = 150pF to 1000pF,
24
150
V/µs
L
measured from +3V to -3V or -3V to +3V
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3: Transmitter skew is measured at the transmitter zero cross points.
4
_______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
CC
A
MAX3224/MAX3226
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224/MAX3226
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224/MAX3226
SLEW RATE vs. LOAD CAPACITANCE
6
5
4
3
2
1
0
16
14
12
10
8
45
40
35
30
25
20
15
10
5
V
OUT+
250kbps
T1 TRANSMITTING AT 250kbps
-SLEW
T2 (MAX3224) TRANSMITTING AT 15.6kbps
120kbps
+SLEW
-1
-2
-3
-4
-5
-6
20kbps
6
4
T1 TRANSMITTING AT 250kbps
T2 (MAX3224) TRANSMITTING AT 15.6kbps
V
OUT-
2
FOR DATA RATES UP TO 250kbps
0
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3225/MAX3227
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3225/MAX3227
SLEW RATE vs. LOAD CAPACITANCE
100
90
80
70
60
50
40
30
20
10
0
7.5
5.0
2.5
0
80
70
60
50
40
30
20
10
0
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225)
LOAD = 3kΩ + C
L
2Mbps
1.5Mbps
-SLEW
+SLEW
1Mbps
2Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225)
1.5Mbps
LOAD = 3kΩ + C
L
1.5Mbps
1Mbps
-2.5
-5.0
-7.5
2Mbps
1Mbps
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225)
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3224–MAX3227
READY TURN-ON TIME
vs. TEMPERATURE
MAX3225/MAX3227
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
MAX3224–MAX3227
READY TURN-OFF TIME
vs. TEMPERATURE
50
45
40
35
30
25
20
15
10
5
38
200
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225)
180
160
140
120
100
80
36
34
32
30
28
26
24
22
20
LOAD = 3kΩ + C
L
AVERAGE; 10 PARTS
60
40
20
0
0
-40 -20
0
20
40
60
80 100
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
CC
A
MAX3244
MAX3244
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3244
SLEW RATE vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
14
12
10
8
60
50
40
30
20
10
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
5
4
V
OUT+
3
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
250kbps
2
120kbps
1
0
6
-1
-2
-3
-4
-5
-6
20kbps
4
2
V
OUT-
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3245
SLEW RATE vs. LOAD CAPACITANCE
7.5
5.0
2.5
0
70
60
50
40
30
20
10
0
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
2 TRANSMITTERS AT 1/16 DATA RATE
1.5Mbps
2Mbps
-2.5
-5.0
-7.5
1Mbps
1 TRANSMITTER AT 1Mbps
2 TRANSMITTERS AT 62.5kbps
0
400
800
1200
1600
2000
0
400
800
1200
1600
2000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245
MAX3245
–7/MAX3245
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
100
90
80
70
60
50
40
30
20
10
0
50
45
40
35
30
25
20
15
10
5
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
2 TRANSMITTERS AT 1/16 DATA RATE
0
0
400
800
1200
1600
2000
0
1000
2000
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
6
_______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
P in De s c rip t io n
PIN
NAME
FUNCTION
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
Ready to Transmit Output, active high. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
1
1
—
READY
2
2
3
28
27
C1+
V+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V generated by the charge pump
3
4
5
4
24
C1-
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V generated by the charge pump
5
1
C2+
6
6
2
C2-
7
7
3
V-
8, 17
9, 16
10, 15
13
8
9–11
4–8
15–19
T_OUT
R_IN
R_OUT
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
9
TTL/CMOS Receiver Outputs
Valid Signal Detector Output, active low. A logic high indicates that a valid
RS-232 level is present on a receiver input.
11
12, 13
14
10
11
12
21
12–14
23
INVALID
T_IN
TTL/CMOS Transmitter Inputs
Force-On Input, active high. Drive high to override AutoShutdown Plus,
keeping transmitters and receivers on (FORCEOFF must be high) (Table 1).
FORCEON
GND
18
19
14
15
25
26
Ground
V
CC
+3.0V to +5.5V Single Supply Voltage
Force-Off Input, active low. Drive low to shut down transmitters, receivers
(except R2OUTB), and charge pump. This overrides AutoShutdown Plus
and FORCEON (Table 1).
20
—
16
—
22
20
FORCEOFF
R2OUTB
TTL/CMOS Noninverting Complementary Receiver Outputs. Always active.
The READY output (MAX3224–MAX3227) is low when
the charge pumps are disabled in shutdown mode. The
READY signal asserts high when V- goes below -4V.
_______________De t a ile d De s c rip t io n
Du a l Ch a rg e -P u m p Vo lt a g e Co n ve rt e r
The MAX3224–MAX3227/MAX3244/MAX3245’s internal
p owe r s up p ly c ons is ts of a re g ula te d d ua l c ha rg e
pump that provides output voltages of +5.5V (doubling
charge pump) and -5.5V (inverting charge pump), over
the +3.0V to +5.5V range. The charge pump operates
in discontinuous mode: if the output voltages are less
than 5.5V, the charge pump is enabled; if the output
voltages exceed 5.5V, the charge-pump is disabled.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS -2 3 2 Tra n s m it t e rs
The tra ns mitte rs a re inve rting le ve l tra ns la tors tha t
convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3224/MAX3226/MAX3244 g ua ra nte e a
250kbps data rate (1Mbps for the MAX3225/MAX3227/
MAX3245) with worst-case loads of 3kΩ in parallel with
1000pF, providing compatibility with PC-to-PC com-
munication software (such as LapLink™). Transmitters
can be paralleled to drive multiple receivers. Figure 1
shows a complete system connection.
LapLink is a trademark of Traveling Software.
_______________________________________________________________________________________
7
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
V
CC
PROTECTION
DIODE
PREVIOUS
RS-232
MAX3244
MAX3245
V
CC
I
Rx
Tx
5k
UART
GND
SHDN = GND
I/O
CHIP
WITH
UART
CPU
RS-232
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
µP
LOGIC
TRANSITION
DETECTOR
Figure 1. Interface Under Control of PMU
MAX3244
MAX3245
I
PROTECTION
DIODE
R2OUTB
When FORCEOFF is driven to ground or when the Auto-
Shutdown Plus circuitry senses that all receiver and
transmitter inputs are inactive for more than 30sec, the
transmitters are disabled and the outputs go into a high-
impedance state. When powered off or shut down, the
outputs can be driven to ±12V. The transmitter inputs
do not have pull-up resistors. Connect unused inputs to
V
CC
R2IN
Rx
R2OUT
THREE-STATED
UART
–7/MAX3245
5k
T1OUT
T1IN
GND or V
.
Tx
CC
RS -2 3 2 Re c e ive rs
GND
FORCEOFF = GND
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3224–MAX3227 feature inverting
outp uts tha t a lwa ys re ma in a c tive (Ta b le 1). The
MAX3244/MAX3245 have inverting three-state outputs
that are high impedance when shut down (FORCEOFF
= GND) (Table 1).
b) NEW MAX3244/MAX3245: IN SHUTDOWN, R2OUTB IS USED TO MONITOR
EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT
PATH THROUGH THE UART’S PROTECTION DIODE.
Figure 2. The MAX3244/MAX3245 detect RS-232 activity when
the UART and interface are shut down.
8
_______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
Table 1. Output Control Truth Table
R_OUT
RECEIVER OR
VALID
RECEIVER
LEVEL
(MAX3224/
MAX3225/
MAX3226/
MAX3227)
R_OUT
(MAX3244/
MAX3245)
R2OUTB
(MAX3244/
MAX3245)
OPERATION
STATUS
TRANSMITTER
EDGE WITHIN
30sec
FORCEON
T_OUT
FORCEOFF
Shutdown
(Forced Off)
X
1
0
1
X
X
X
X
High-Z
Active
Active
Active
High-Z
Active
Active
Active
Normal
Operation
(Forced On)
Normal
Operation
(AutoShutdown
Plus)
0
1
X
Yes
Active
Active
Active
Active
Shutdown (Auto-
Shutdown Plus)
0
1
1
X
No
X
High-Z
Active
Active
Active
Active
Active
Active
Active
Normal
Operation
Yes
INVALID*
Normal
Operation
1
1
X
Yes
No
Active
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
Shutdown
No
High-Z
Normal
Operation
(AutoShutdown)
Yes
No
X
X
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
INVALID**
INVALID**
Shutdown
(AutoShutdown)
High-Z
High-Z
X = Don’t care
* INVALID connected to FORCEON
** INVALID connected to FORCEON and FORCEOFF
The MAX3244/MAX3245 fe a ture a n e xtra , a lwa ys
active, noninverting output, R2OUTB. R2OUTB output
monitors receiver activity while the other receivers are
high impedance, allowing Ring Indicator applications to
be monitored without forward biasing other devices
connected to the receiver outputs. This is ideal for sys-
Au t o S h u t d o w n P lu s Mo d e
The MAX3224–MAX3227/MAX3244/MAX3245 achieve a
1µA s up p ly c urre nt with Ma xim’s AutoShutd own
Plusfeature, which operates when FORCEOFF is high
and a FORCEON is low. When these devices do not
sense a valid signal transition on any receiver and trans-
mitter input for 30sec, the on-board charge pumps are
shut down, reducing supply current to 1µA. This occurs
if the RS-232 cable is disconnected or if the connected
peripheral transmitters are turned off, and the UART dri-
ving the transmitter inputs is inactive. The system turns
on a g a in whe n a va lid tra ns ition is a p p lie d to a ny
RS-232 receiver or transmitter input. As a result, the sys-
tem saves power without changes to the existing BIOS
or operating system.
te ms whe re V
is s e t to g round in s hutd own to
CC
accommodate peripherals such as UARTs (Figure 2).
The MAX3224–MAX3227/MAX3244/MAX3245 feature
an INVALID output that is enabled low when no valid
RS-232 volta g e le ve ls ha ve b e e n d e te c te d on a ll
receiver inputs. Because INVALID indicates the receiv-
er input’s condition, it is independent of FORCEON and
FORCEOFF states (Figures 3 and 4).
_______________________________________________________________________________________
9
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
EDGE
DETECT
+0.3V
T_IN
FORCEOFF
S
R_IN
AUTOSHDN
30sec
TIMER
30µs
TIMER
R
EDGE
DETECT
INVALID
R_IN
R
-0.3V
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST 30µs.
FORCEON
Figure 3a. INVALID Functional Diagram, INVALID Low
Figure 3c. AutoShutdown Plus Logic
+2.7V
FORCEOFF
POWERDOWN*
FORCEON
R_IN
30µs
TIMER
R
AUTOSHDN
INVALID
-2.7V
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V
FOR LESS THAN 30µs.
Figure 3d. Power-Down Logic
Figure 3b. INVALID Functional Diagram, INVALID High
Table 2. INVALID Truth Table
INVALID HIGH
RS-232 SIGNAL
PRESENT AT ANY
RECEIVER INPUT
+2.7V
INVALID OUTPUT
INDETERMINATE
Yes
No
High
Low
+0.3V
0
INVALID LOW
INDETERMINATE
INVALID HIGH
-0.3V
Figures 3a and 3b depict valid and invalid RS-232
receiver voltage levels. INVALID indicates the receiver
input’s condition, and is independent of FORCEON and
FORCEOFF states. Figure 3 and Tables 1 and 2 sum-
ma rize the op e ra ting mod e s of the MAX3224–
MAX3227/MAX3244/MAX3245 devices. FORCEON and
FORCEOFF ove rrid e AutoShutd own Plus c irc uitry.
Whe n ne ithe r c ontrol is a s s e rte d , the IC s e le c ts
between these states automatically based on the last
receiver or transmitter input edge received.
-2.7V
–7/MAX3245
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
By connecting FORCEON to INVALID, the MAX3224–
MAX3227/MAX3244/MAX3245 shut down when no valid
receiver level and no receiver or transmitter edge is
detected for 30sec, and wake up when a valid receiver
level or receiver or transmitter edge is detected.
When shut down, the device’s charge pumps turn off,
V+ is pulled to V , V- is pulled to ground, the transmit-
CC
te r outp uts a re hig h imp e d a nc e , a nd READY
(MAX3224–MAX3227) is driven low. The time required
to exit shutdown is typically 100µs (Figure 8).
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224–MAX3227/MAX3244/MAX3245 shutdown
when no valid receiver level is detected and wake up
10 ______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
RECEIVER
INPUTS
INVALID
REGION
}
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
V
INVALID
OUTPUT
CC
t
INVL
t
INVH
t
0
AUTOSHDN
t
AUTOSHDN
t
t
WU
WU
*V
CC
OUTPUT
0
V+
V
CC
0
V-
*MAX3224–MAX3227
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
when a valid receiver level is detected (same function-
ality as AutoShutdown feature on MAX3221/MAX3223/
MAX3243).
POWER-
MANAGEMENT
UNIT
MASTER SHDN LINE
0.1µF
1M
A mouse or other system with AutoShutdown Plus may
need time to wake up. Figure 5 shows a circuit that
forces the transmitters on for 100ms, allowing enough
time for the other system to realize that the MAX3244/
MAX3245 is awake. If the other system outputs valid
RS-232 signal transitions within that time, the RS-232
ports on both systems remain enabled.
FORCEOFF FORCEON
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
S o ft w a re -Co n t ro lle d S h u t d o w n
If direct software control is desired, use INVALID to
indicate DTR or Ring Indicator signal. Tie FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus so the line acts like a SHDN input.
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
______________________________________________________________________________________ 11
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
Hig h Da t a Ra t e s
__________Ap p lic a t io n s In fo rm a t io n
The MAX3224/MAX3226/MAX3244 maintain the RS-232
±5.0V minimum transmitter output voltage even at high
data rates. Figure 7 shows a transmitter loopback test
c irc uit. Fig ure 8 s hows a loop b a c k te s t re s ult a t
120kb p s , a nd Fig ure 9 s hows the s a me te s t a t
250kbps. For Figure 8, all transmitters were driven
Ca p a c it o r S e le c t io n
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 3 for required capacitor values. Do not use val-
ues smaller than those listed in Table 3. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
FORCEON =
FORCEOFF
5V/div
0
T1OUT
and C
the other capacitors).
, to maintain the proper ratios (C1 to
BYPASS
2V/div
0
When using the minimum required capacitor values,
ma ke s ure the c a p a c itor va lue d oe s not d e g ra d e
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
T2OUT
V
= 3.3V
CC
5V/div
0
C1–C4 = 0.1µF
READY
5µs/div
P o w e r-S u p p ly De c o u p lin g
Figure 6. Transmitter Outputs when Exiting Shutdown or
Powering Up
In most circumstances, a 0.1µF V
bypass capacitor
CC
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
V
CC
C
BYPASS
Tra n s m it t e r Ou t p u t s
w h e n Ex it in g S h u t d o w n
V
CC
C1+
V+
V-
C3*
C4
Figure 6 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 3kΩ 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 the magnitude
of V- exceeds approximately -3V.
C1
C1-
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
C2+
C2
C2-
–7/MAX3245
T_ OUT
T_ IN
R_ IN
5k
R_ OUT
Table 3. Required Minimum Capacitance
Values
1000pF
FORCEON
FORCEOFF
V
(V)
C1, C
C2, C3, C4
(µF)
BYPASS
CC
(µF)
V
CC
GND
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
0.1
0.1
0.33
1
0.047
0.22
*C3 CAN BE RETURNED TO V OR GND.
CC
Figure 7. Loopback Test Circuit
12 ______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 9, a single transmitter was dri-
ven at 250kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 250pF.
Mo u s e Drive a b ilit y
The MAX3244/MAX3245 are specifically designed to
power serial mice while operating from low-voltage
power supplies. They have been tested with leading
mouse brands from manufacturers such as Microsoft
and Logitech. The MAX3244/MAX3245 successfully
drove all serial mice tested and met their respective
c urre nt a nd volta g e re q uire me nts . The MAX3244/
MAX3245 dual charge pump ensures the transmitters
will supply at least ±5V during worst-case conditions.
Figure 11a shows the transmitter output voltages under
increasing load current. Figure 11b shows a typical
mouse connection.
The MAX3225/MAX3227/MAX3245 maintain the RS-232
±5.0V minimum transmitter output voltage at data rates
up to 1Mbps (MegaBaud). Figure 10 shows a loopback
test result with a single transmitter driven at 1Mbps and
all transmitters loaded with an RS-232 receiver in paral-
lel with 250pF.
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
T1IN
T1IN
T1OUT
T1OUT
R1OUT
R1OUT
V
CC
= 3.3V
V
CC
= 3.3V
200ns/div
2µs/div
Figure 8. MAX3224/MAX3226/MAX3244 Loopback Test Result
at 120kbps
Figure 10. MAX3225/MAX3227/MAX3245 Loopback Test
Result at 1Mbps
6
5
V
4
3
OUT+
V
= 3.0V
5V/div
5V/div
5V/div
T1IN
T1OUT
R1OUT
CC
2
V
1
OUT+
0
-1
-2
-3
-4
-5
-6
V
CC
V
OUT-
V
OUT-
V
CC
= 3.3V
0
1
2
3
4
5
6
7
8
9
10
2µs/div
LOAD CURRENT PER TRANSMITTER (mA)
Figure 9. MAX3224/MAX3226/MAX3244 Loopback Test Result
at 250kbps
Figure 11a. MAX324_ Transmitter Output Voltage vs. Load
Current per Transmitter
______________________________________________________________________________________ 13
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
+3.3V
26
0.1µF
V
CC
27
3
28
C1+
V+
C1
0.1µF
C3
0.1µF
24
1
C1-
COMPUTER SERIAL PORT
MAX3244
MAX3245
C2+
V-
C4
C2
0.1µF
0.1µF
2
C2-
+V
+V
-V
T1IN
T1OUT
9
14
T2IN
T3IN
LOGIC
INPUTS
T2OUT 10
13
12
11
T3OUT
GND
Tx
R2OUTB
20
R1OUT
R2OUT
R1IN
R2IN
4
5
19
18
5k
5k
5k
LOGIC
OUTPUTS
R3OUT
R4OUT
R5OUT
6
7
8
R3IN
R4IN
R5IN
17
16
RS-232
INPUTS
–7/MAX3245
5k
5k
SERIAL
MOUSE
15
23
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 11b. Mouse Driver Test Circuit
14 ______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
In t e rc o n n e c t io n w it h 3 V a n d 5 V Lo g ic
The MAX3224–MAX3227/MAX3244/MAX3245 c a n
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 4 for more infor-
mation on possible combinations of interconnections.
Table 5 lists other Maxim 3.0V to 5.5V powered trans-
ceivers.
Table 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM
V
SUPPLY
CC
POWER-SUPPLY
VOLTAGE (V)
VOLTAGE
(V)
COMPATIBILITY
3.3
5
3.3
5
Compatible with all CMOS families
Compatible with all TTL and CMOS families
5
3.3
Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS
Table 5. 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
SUPPLY
NO.
OF
Tx/Rx
SUPPLY
CURRENT
(µA)
AUTO-
SHUTDOWN
PLUS
GUARANTEED
DATA RATE
(bps)
VOLTAGE
RANGE
(V)
AUTO-
SHUTDOWN
PART
MAX3241
MAX3243
MAX3244
MAX3245
MAX3232
MAX3222
MAX3223
MAX3224
MAX3225
MAX3221
MAX3226
MAX3227
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
3/5
3/5
3/5
3/5
2/2
2/2
2/2
2/2
2/2
1/1
1/1
1/1
300
1
—
—
—
Yes
—
120k
120k
250k
1M
1
Yes
Yes
—
1
—
300
300
1
—
120k
120k
120k
250k
1M
—
—
—
Yes
—
1
Yes
Yes
—
1
—
1
Yes
—
120k
250k
1M
1
Yes
Yes
1
—
______________________________________________________________________________________ 15
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
___________________________________________________Typ ic a l Op e ra t in g Circ u it s
+3.3V
26
+3.3V
15
C
BYPASS
0.1µF
0.1µF
C
BYPASS
V
V
CC
CC
3
7
2
27
3
28
C1+
C1+
V+
V-
V+
C1
0.1µF
C1
0.1µF
C3
0.1µF
C3
0.1µF
4
5
6
24
1
C1-
C1-
MAX3226
MAX3227
C2+
MAX3244
MAX3245
C2+
V-
C4
0.1µF
C2
C2
0.1µF
C4
2
0.1µF
0.1µF
C2-
C2-
T1IN
11
9
T1IN
T1OUT 13
T1OUT
9
14
T2IN
T3IN
T2OUT 10
13
12
R1OUT
R1IN
5k
8
11
21
T3OUT
FORCEOFF
FORCEON
22
23
TO POWER-
MANAGEMENT
UNIT
READY
INVALID 10
1
INVALID
AUTOSHUTDOWN
PLUS
AUTOSHUTDOWN
PLUS
FORCEOFF
FORCEON
16
12
V
CC
R2OUTB
R1OUT
20
19
GND
14
R1IN
4
5
+3.3V
5k
19
C
BYPASS
0.1µF
R2OUT
R3OUT
R4OUT
R2IN
V
18
17
16
CC
3
7
2
C1+
V+
V-
C1
C3
5k
4
5
6
0.1µF
0.1µF
C1-
MAX3224
MAX3225
6
7
R3IN
5k
C2+
C4
0.1µF
C2
0.1µF
C2-
R4IN
5k
13
12
T1IN
T1OUT 17
TTL/CMOS
INPUTS
RS-232
OUTPUTS
8
T2IN
T2OUT
R5OUT
15
R5IN
5k
8
–7/MAX3245
16
15 R1OUT
R1IN
GND
25
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5k
R2IN
10 R2OUT
9
5k
TO POWER-
MANAGEMENT
UNIT
AUTOSHUTDOWN
PLUS
READY
INVALID 11
1
FORCEOFF
FORCEON
20
14
V
CC
GND
18
16 ______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
___________________________________________________________P in Co n fig u ra t io n s
READY
16 FORCEOFF
1
2
3
4
5
6
7
8
C2+
C2-
C1+
V+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
15
14
C1+
V+
V
CC
GND
V-
V
CC
3
C1-
C2+
C2-
V-
13 T1OUT
MAX3226
MAX3227
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T1IN
GND
4
FORCEON
12
C1-
5
MAX3244
MAX3245
11 T1IN
10 INVALID
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
7
9
R1IN
R1OUT
8
9
SSOP
10
11
12
13
14
READY
C1+
V+
FORCEOFF
1
2
20
19
18
17
16
15
14
13
12
11
V
CC
GND
3
C1-
T1OUT
R1IN
4
SO/SSOP
MAX3224
MAX3225
C2+
C2-
5
R1OUT
FORCEON
T1IN
6
V-
7
T2OUT
8
R2IN
T2IN
9
R2OUT
INVALID
10
DIP/SSOP
__Ord e rin g In fo rm a t io n (c o n t in u e d )
___________________Ch ip In fo rm a t io n
MAX3224
PART
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 SSOP
TRANSISTOR COUNT: 1129
MAX3226CAE
MAX3226EAE
MAX3227CAE
MAX3227EAE
MAX3244CWI
MAX3244CAI
MAX3244EWI
MAX3244EAI
MAX3245CWI
MAX3245CAI
MAX3245EWI
MAX3245EAI
16 SSOP
MAX3225
TRANSISTOR COUNT: 1129
16 SSOP
16 SSOP
MAX3226
TRANSISTOR COUNT: 1129
28 Wide SO
28 SSOP
MAX3227
TRANSISTOR COUNT: 1129
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
MAX3244/MAX3245
TRANSISTOR COUNT: 1335
28 Wide SO
28 SSOP
______________________________________________________________________________________ 17
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
________________________________________________________P a c k a g e In fo rm a t io n
–7/MAX3245
18 ______________________________________________________________________________________
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
______________________________________________________________________________________ 19
1 µA S u p p ly Cu rre n t , 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
–7/MAX3245
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.
20 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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