MAX3224CTP [MAXIM]
1μA 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： | MAX3224CTP |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1μA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus |
| 文件： | 总20页 (文件大小：212K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1289; Rev 4; 10/08
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
________________General Description
_Next Generation Device Features
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.
♦ For Smaller Packaging:
MAX3228/MAX3229: +2.5V to +5.5V RS-232
Transceivers in UCSP™
♦ For Low-Voltage or Data Cable Applications:
All devices achieve a 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These
devices automatically enter a low-power shutdown
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-
er input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system.
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2 Tx/2 Rx RS-232 Transceivers with 15kV ESD-
Protected I/O and Logic Pins
♦ For Integrated ESD Protection:
MAX3222E/MAX3232E/MAX3237E/MAX3241E†/
MAX3246E: 15kV ESD-Protected, Down to 10nA,
+3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in UCSP)
The MAX3225/MAX3227/MAX3245 also feature
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.
_______________Ordering Information
PART
MAX3224CPP
MAX3224CAP
MAX3224CTP
MAX3224CUP
MAX3224EPP
MAX3224EAP
TEMP RANGE
0°C to +70°C
0°C to +70°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
20 Thin QFN-EP*
20 TSSOP
20 Plastic DIP
20 SSOP
20 Thin QFN-EP*
5mm x 5mm
All devices are available in a space-saving TQFN,
TSSOP, and SSOP packages.
MAX3224ETP
MAX3224EUP
-40°C to +85°C
-40°C to +85°C
20 TSSOP
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Ordering Information continued at end of data sheet.
*EP = Exposed paddle.
_____________________ Selector Guide
Battery-Powered Equipment
Handheld 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, MegaBaud, and UCSP are trademarks
of Maxim Integrated Products, Inc.
†
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 pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
ABSOLUTE MAXIMUM RATINGS
CC
V
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 TQFN (derate 21.3mW/°C above +70°C)........1702.1mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
20-Pin TSSOP (derate 7.00mW/°C above +70°C) .......559mW
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
T_OUT to GND............................................................. 13.2V
R_OUT, INVALID, READY to GND .........-0.3V to (V
Short-Circuit Duration
T_OUT to GND .......................................................Continuous
+ 0.3V)
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, 10s) .................................+300°C
CC
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
CC
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ; T = T
to T
,
MAX
L
A
MIN
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
= 3.3V or 5.0V, T = +25°C)
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
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
Supply Current,
AutoShutdown Plus Disabled
FORCEOFF = GND
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
CC
= 3.3V
= 5.0V
2
T_IN, FORCEON,
Input Logic Threshold High
FORCEOFF
V
2.4
Transmitter Input Hysteresis
Input Leakage Current
0.5
V
0.01
1
10
µA
T_IN, FORCEON, FORCEOFF
–7/MAX3245
R_OUT (MAX3244/MAX3245), receivers
disabled
Output Leakage Current
0.05
µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
I
I
= 1.6mA
= -1.0mA
0.4
V
V
OUT
V
CC
- 0.6 V
- 0.1
OUT
CC
-25
0.6
0.8
+25
V
V
V
CC
V
CC
V
CC
V
CC
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.2
Input Threshold Low
Input Threshold High
T
T
= +25°C
= +25°C
A
1.5
1.5
1.8
0.5
5
2.4
2.4
V
A
Input Hysteresis
Input Resistance
V
T
= +25°C
3
7
kΩ
A
2
_______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
ELECTRICAL CHARACTERISTICS (continued)
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ; T = T
to T
,
MAX
CC
L
A
MIN
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
V
Output Resistance
V
CC
= V+ = V- = 0, transmitter outputs = 2V
300
10M
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
Figure 4a
V
V
INVALID Output High
-2.7
-0.3
Receiver Input Threshold to
Figure 4a
0.3
0.4
INVALID Output Low
INVALID, READY
(MAX3224–MAX3227)
Output Voltage Low
I
= -1.6mA
= -1.0mA
V
V
OUT
OUT
INVALID, READY
(MAX3224–MAX3227)
Output Voltage High
I
V
- 0.6
CC
Receiver Positive or Negative
Threshold to INVALID High
t
V
CC
V
CC
V
CC
V
CC
= 5V, Figure 4b
= 5V, Figure 4b
1
µs
µs
µs
s
INVH
Receiver Positive or Negative
Threshold to INVALID Low
t
30
INVL
Receiver or Transmitter Edge to
Transmitters Enabled
t
= 5V, Figure 5b (Note 2)
= 5V, Figure 5b (Note 2)
100
30
WU
Receiver or Transmitter Edge to
Transmitters Shutdown
tAUTOSHDN
15
60
_______________________________________________________________________________________
3
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
TIMING CHARACTERISTICS—MAX3224/MAX3226/MAX3244
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ; T = T
to T
,
MAX
CC
L
A
MIN
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
R = 3kΩ, C = 1000pF,
one transmitter switching
MIN
TYP
MAX
UNITS
L
L
Maximum Data Rate
250
kbps
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
⏐ PHL PLH ⏐
Receiver Skew
t
- t
⏐ PHL PLH ⏐
C = 150pF
to 1000pF
L
V
= 3.3V, T = +25°C,
A
CC
L
6
4
30
30
R = 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V
Transition-Region Slew Rate
V/µs
C = 150pF
L
to 2500pF
TIMING CHARACTERISTICS—MAX3225/MAX3227/MAX3245
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ; C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ; T = T
to T
,
MAX
CC
L
A
MIN
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R = 3kΩ, C = 1000pF,
one transmitter switching
L
L
250
V
= 3.0V to 4.5V, R = 3kΩ,
CC
L
L
Maximum Data Rate
1000
1000
kbps
C = 250pF, one transmitter switching
V
CC
= 4.5V to 5.5V, R = 3kΩ,
L
C = 1000pF, one transmitter switching
L
t
t
0.15
0.15
200
200
25
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 (MAX3245 only)
Normal operation (MAX3245 only)
(Note 3)
ns
ns
ns
ns
t
- t
⏐ PHL PLH ⏐
–7/MAX3245
Receiver Skew
t
- t
50
⏐ PHL PLH ⏐
V
CC
= 3.3V, T = +25°C,
A
Transition-Region Slew Rate
R = 3kΩ to 7kΩ, C = 150pF to 1000pF,
24
150
V/µs
L
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
_______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
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
45
40
35
30
25
20
15
10
5
16
14
12
10
8
V
OUT+
250kbps
T1 TRANSMITTING AT 250kbps
-SLEW
120kbps
T2 (MAX3224) TRANSMITTING AT 15.6kbps
+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
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3225/MAX3227
OPERATING SUPPLY CURRENT
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
2Mbps
L
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)
MAX3225/MAX3227
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
MAX3224–MAX3227
READY TURN-ON TIME
vs. TEMPERATURE
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
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
A
MAX3244
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3244
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3244
SLEW RATE vs. LOAD CAPACITANCE
14
12
10
8
60
50
40
30
20
10
0
6
5
4
3
2
1
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
250kbps
120kbps
6
20kbps
-1
-2
-3
-4
-5
-6
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
70
60
50
40
30
20
10
0
7.5
5.0
2.5
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
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
–7/MAX3245
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
_______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
Pin Description
PIN
MAX3224
MAX3225
NAME
FUNCTION
MAX3226 MAX3244
MAX3227 MAX3245
DIP/
SSIP/
TQFN
TSSOP
Ready to Transmit Output, Active High. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
1
19
1
—
READY
2
1
20
2
3
28
C1+
V+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V Generated By the Charge Pump
3
4
27
2
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
3
5
1
2
C2+
C2-
6
4
6
7
5
7
3
V-
8, 17
9, 16
10, 15
6, 15
7, 14
8, 13
13
8
9, 10, 11
4–8
T_OUT
R_IN
R_OUT
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
9
15–19
TTL/CMOS Transmitter Outputs
Valid Signal Detector Output, Active Low. A logic-high indicates that a
valid RS-232 level is present on a receiver input.
11
9
10
11
21
INVALID
12, 13
10, 11
12, 13, 14
T_IN
TTL/CMOS Transmitter Inputs
Force-On Input, Active High. Drive high to override AutoShutdown
14
12
12
23
FORCEON Plus, keeping transmitters and receivers on (FORCEOFF must be high)
(Table 1).
18
19
16
17
14
15
25
26
GND
Ground
V
+3.0V to +5.5V Single Supply Voltage
CC
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
18
16
22
FORCEOFF
TTL/CMOS Noninverting Complementary Receiver Outputs. Always
active.
—
—
—
—
—
20
—
R2OUTB
EP
Exposed Paddle. Solder the exposed paddle to the ground, or leave
unconnected.
EP
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.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3224–MAX3227/MAX3244/MAX3245’s internal
power supply consists of a regulated dual charge
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
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.
LapLink is a trademark of Traveling Software.
_______________________________________________________________________________________
7
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
V
CC
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
PROTECTION
DIODE
PREVIOUS
RS-232
MAX3244
MAX3245
V
CC
I
Rx
Tx
5kΩ
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
MAX3244
MAX3245
I
Figure 1. Interface Under Control of PMU
PROTECTION
DIODE
R2OUTB
RS-232 Transmitters
The transmitters are inverting level translators that
convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3224/MAX3226/MAX3244 guarantee 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.
V
CC
R2IN
Rx
R2OUT
THREE-STATED
UART
5kΩ
–7/MAX3245
T1OUT
T1IN
Tx
GND
FORCEOFF = GND
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
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.
GND or V
.
CC
8
_______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–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
High-Z
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
Shutdown
No
Normal
Operation
(AutoShutdown)
Yes
No
X
X
Active
High-Z
Active
Active
Active
High-Z
Active
Active
INVALID*
INVALID*
INVALID**
INVALID**
Shutdown
(AutoShutdown)
X = Don’t care
*INVALID connected to FORCEON
**INVALID connected to FORCEON and FORCEOFF
The MAX3224–MAX3227/MAX3244/MAX3245 feature
an INVALID output that is enabled low when no valid
RS-232 voltage levels have been detected on all receiv-
er inputs. Because INVALID indicates the receiver
input’s condition, it is independent of FORCEON and
FORCEOFF states (Figures 3 and 4).
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3224–MAX3227 feature inverting
outputs that always remain active (Table 1). The
MAX3244/MAX3245 have inverting three-state outputs
that are high impedance when shut down (FORCEOFF
= GND) (Table 1).
AutoShutdown Plus Mode
The MAX3224–MAX3227/MAX3244/MAX3245 achieve a
1µA supply current with Maxim’s AutoShutdown
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
The MAX3244/MAX3245 feature an extra, always
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-
tems where V
is set to ground in shutdown to
CC
accommodate peripherals such as UARTs (Figure 2).
_______________________________________________________________________________________
9
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
EDGE
DETECT
+0.3V
T_IN
FORCEOFF
S
R_IN
-0.3V
AUTOSHDN
30sec
TIMER
30µs
TIMER
R
EDGE
DETECT
INVALID
R_IN
R
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
peripheral transmitters are turned off, and the UART dri-
ving the transmitter inputs is inactive. The system turns
on again when a valid transition is applied to any
RS-232 receiver or transmitter input. As a result, the sys-
tem saves power without changes to the existing BIOS
or operating system.
-2.7V
–7/MAX3245
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
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-
marize the operating modes of the MAX3224–
MAX3227/MAX3244/MAX3245 devices. FORCEON and
FORCEOFF override AutoShutdown Plus circuitry.
When neither control is asserted, the IC selects
between these states automatically based on the last
receiver or transmitter input edge received.
When shut down, the device’s charge pumps turn off,
V+ is pulled to V , V- is pulled to ground, the transmit-
CC
ter outputs are high impedance, and READY
(MAX3224–MAX3227) is driven low. The time required
to exit shutdown is typically 100µs (Figure 8).
10 ______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–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
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.
POWER-
MANAGEMENT
UNIT
MASTER SHDN LINE
0.1μF
1MΩ
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224–MAX3227/MAX3244/MAX3245 shutdown
when no valid receiver level is detected and wake up
when a valid receiver level is detected (same function-
ality as AutoShutdown feature on MAX3221/MAX3223/
MAX3243).
FORCEOFF FORCEON
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
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.
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
______________________________________________________________________________________ 11
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
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.
Software-Controlled Shutdown
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.
__________Applications Information
FORCEON =
FORCEOFF
5V/div
Capacitor Selection
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,
0
T1OUT
2V/div
0
T2OUT
V
= 3.3V
CC
5V/div
0
C1–C4 = 0.1μF
READY
and C
, to maintain the proper ratios (C1 to
BYPASS
the other capacitors).
5μs/div
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiva-
lent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Figure 6. Transmitter Outputs when Exiting Shutdown or
Powering Up
V
CC
C
BYPASS
V
CC
C1+
V+
V-
Power-Supply Decoupling
C3*
C4
C1
In most circumstances, a 0.1µF V
bypass capacitor
CC
C1-
C2+
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
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.
C2
C2-
Transmitter Outputs
when Exiting Shutdown
T_ OUT
T_ IN
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
–7/MAX3245
R_ IN
R_ OUT
5kΩ
1000pF
FORCEON
FORCEOFF
Table 3. Required Minimum Capacitance
Values
V
CC
GND
V
(V)
C1, C
C2, C3, C4
(µF)
BYPASS
CC
(µF)
*C3 CAN BE RETURNED TO V OR GND.
CC
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
Figure 7. Loopback Test Circuit
12 ______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
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.
High Data Rates
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
circuit. Figure 8 shows a loopback test result at
120kbps, and Figure 9 shows the same test at
250kbps. For Figure 8, all transmitters were driven
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.
Mouse Driveability
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
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
V
1
OUT+
0
-1
-2
-3
-4
-5
-6
V
CC
1
OUT-
V
OUT-
V
CC
= 3.3V
0
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
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
+3.3V
26
0.1μF
V
CC
27
3
28
C1+
V+
C1
0.1μF
C3
0.1μF
24
1
C1-
C2+
COMPUTER SERIAL PORT
MAX3244
MAX3245
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
R3OUT
R1IN
4
5
19
18
17
5kΩ
R2IN
R3IN
R4IN
R5IN
5kΩ
5kΩ
LOGIC
OUTPUTS
6
7
8
RS-232
INPUTS
R4OUT
R5OUT
16
–7/MAX3245
5kΩ
SERIAL
MOUSE
15
23
5kΩ
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 11b. Mouse Driver Test Circuit
14 ______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
drove all serial mice tested and met their respective
current and voltage requirements. 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.
Interconnection with 3V and 5V Logic
The MAX3224–MAX3227/MAX3244/MAX3245 can
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 4 for more informa-
tion 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
CC
SUPPLY
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
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
___________________________________________________Typical Operating Circuits
+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-
C2+
C1-
C2+
MAX3226
MAX3227
MAX3244
MAX3245
V-
C4
0.1μF
C2
0.1μF
C2
0.1μF
C4
2
0.1μF
C2-
C2-
T1IN
11
9
T1IN
T1OUT 13
T1OUT
9
14
T2IN
T3IN
T2OUT 10
13
12
R1OUT
R1IN 8
5kΩ
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
5kΩ
19
C
0.1μF
BYPASS
R2OUT
R3OUT
R4OUT
R2IN
V
18
17
16
CC
3
7
2
C1+
V+
V-
C1
0.1μF
C3
0.1μF
5kΩ
4
5
6
C1-
C2+
MAX3224*
MAX3225*
6
7
R3IN
C4
0.1μF
C2
0.1μF
5kΩ
C2-
R4IN
13
T1IN
T1OUT 17
5kΩ
TTL/CMOS
INPUTS
RS-232
OUTPUTS
8
T2IN
T2OUT
12
R5OUT
15
R5IN
8
–7/MAX3245
5kΩ
16
15 R1OUT
R1IN
GND
25
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
R2IN
10 R2OUT
9
5kΩ
TO POWER-
MANAGEMENT
UNIT
AUTOSHUTDOWN
PLUS
READY
INVALID 11
1
FORCEOFF
FORCEON
20
14
V
CC
GND
18
*MAX3224/MAX3225 PINOUT REFERS TO DIP/SSOP/TSSOP PACKAGES.
16 ______________________________________________________________________________________
234–5/7MXA
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
___________________________________________________________Pin Configurations
READY
C1+
V+
FORCEOFF
READY
16 FORCEOFF
1
2
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
12
11
V
CC
15
14
C1+
V+
V
CC
GND
3
GND
C1-
T1OUT
R1IN
C1-
C2+
C2-
V-
13 T1OUT
4
MAX3226
MAX3227
MAX3224
MAX3225
C2+
C2-
FORCEON
5
12
R1OUT
FORCEON
T1IN
6
11 T1IN
10 INVALID
V-
7
T2OUT
9
R1IN
R1OUT
8
R2IN
T2IN
9
SSOP
R2OUT
INVALID
10
DIP/SSOP/TSSOP
C2+
C2-
C1+
V+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
V-
V
CC
3
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T1IN
GND
4
15
14
13
12
11
C1-
5
MAX3244
MAX3245
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
T2IN
10
GND 16
17
FORCEOFF 18
7
INVALID
9
8
7
6
V
CC
8
R2OUT
R2IN
9
MAX3244
MAX3225
READY
V+
10
11
12
13
14
19
20
EXPOSED PADDLE
T2OUT
1
2
3
4
5
TQFN
SO/SSOP
______________________________________________________________________________________ 17
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
_ Ordering Information (continued)
___________________Chip Information
MAX3224 TRANSISTOR COUNT: 1129
MAX3225 TRANSISTOR COUNT: 1129
MAX3226 TRANSISTOR COUNT: 1129
MAX3227 TRANSISTOR COUNT: 1129
MAX3244/MAX3245 TRANSISTOR COUNT: 1335
PROCESS: BiCMOS
PART
MAX3225CPP
MAX3225CAP
MAX3225CTP
MAX3225CUP
MAX3225EPP
MAX3225EAP
MAX3225ETP
MAX3225EUP
MAX3225EUP/V
MAX3226CAE
MAX3226EAE
MAX3227CAE
MAX3227EAE
MAX3244CWI
MAX3244CAI
MAX3244EWI
MAX3244EAI
MAX3245CWI
MAX3245CAI
MAX3245EWI
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
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
20 Plastic DIP
20 SSOP
20 Thin QFN-EP*
20 TSSOP
20 Plastic DIP
20 SSOP
20 Thin QFN-EP*
20 TSSOP
20 TSSOP
16 SSOP
16 SSOP
16 SSOP
16 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
MAX3245EAI
*EP = Exposed paddle.
/V denotes an automotive qualified part.
–7/MAX3245
18 ______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
–7/MAX3245
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
16 SSOP
PACKAGE CODE
DOCUMENT NO.
21-0056
—
T4477-3
T2055-5
—
20 SSOP
21-0056
20 Thin QFN-EP
20 TSSOP
21-0140
21-0108
20 Plastic DIP
28 Wide SO
28 SSOP
—
21-0043
—
21-0042
—
21-0056
______________________________________________________________________________________ 19
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
2
3
5/05
Added new packaging types
Added automotive qualified product information
⎯
10/08
1, 18
–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 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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