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19-1144; Rev 0; 9/96
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM
_______________General Description
The MAX3238 true RS-232 transceiver achieves a 1A supply current with Maxim's revolutionary AutoShutdown Plus feature. When the device does not sense a valid signal transition on either the receiver or transmitter inputs within 30sec, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input, saving power without changes to the existing BIOS or operating system. The MAX3238 5-driver/3-receiver complete serial port is a 3V-powered EIA/TIA-232 and V.28/V.24 communications interface intended for notebook or subnotebook computer applications. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 250kbps provides compatibility with popular software for communicating with personal computers. The MAX3238 requires only 0.1F capacitors in 3.3V operation. It is ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5V-only systems that require true RS-232 performance. Receiver R1 has an extra, always-active output (in addition to its standard output), which allows external devices, such as a modem, to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed. The MAX3238 is available in a space-saving SSOP package.
____________________________Features
o 1A Supply Current Achieved with AutoShutdown Plus o Guaranteed Data Rate: 250kbps o 1A Low-Power Shutdown o Receivers Active in AutoShutdown Plus Mode o Flow-Through Pinout o Meets EIA/TIA-232 Specifications Down to 3.0V o Guaranteed 6V/s Slew Rate
MAX3238*
______________Ordering Information
PART MAX3238CAI MAX3238EAI TEMP. RANGE 0C to +70C -40C to +85C PIN-PACKAGE 28 SSOP 28 SSOP
__________________Pin Configuration
TOP VIEW
C2+ GND C2VT1OUT T2OUT T3OUT R1IN R2IN 1 2 3 4 5 6 7 8 9 28 C1+ 27 V+ 26 VCC 25 C1-
________________________Applications
Notebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers
MAX3238
24 T1IN 23 T2IN 22 T3IN 21 R1OUT 20 R2OUT 19 T4IN 18 R3OUT 17 T5IN 16 R1OUTB 15 INVALID
T4OUT 10 R3IN 11
Typical Operating Circuit appears at end of data sheet.
T5OUT 12 FORCEON 13 FORCEOFF 14
AutoShutdown Plus is a trademark of Maxim Integrated Products. *Patents Pending
SSOP 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +6V V+ (Note 1) ...............................................................-0.3V to +7V V- (Note 1) ................................................................+0.3V to -7V V+ + |V-| (Note 1) .................................................................+13V Input Voltages T_IN, FORCEOFF, FORCEON ..............................-0.3V to +6V R_IN .................................................................................25V Output Voltages T_OUT...........................................................................13.2V R_OUT, INVALID ....................................-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT (one at a time) ............................................Continuous Continuous Power Dissipation (TA = +70C) SSOP (derate 9.52mW/C above +70C) ....................762mW Operating Temperature Ranges MAX3238CAI ......................................................0C to +70C MAX3238EAI....................................................-40C to +85C Storage Temperature Range ............................-65C to +160C Lead Temperature (soldering, 10sec) ............................+300C
Note 1: V+ and V- can have a maximum magnitude of +7V, but their absolute difference can not 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 CC = +3.0V to +5.5V; C1-C4 = 0.1F (tested at 3.3V 5%), C1-C4 = 0.22F (tested at 3.3V 10%), C1 = 0.047F and C2-C4 = 0.33F (tested at 5.0V 10%); TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25C.) PARAMETER DC CHARACTERISTICS Supply Current, AutoShutdown Plus VCC = 3.3V or 5.0V, TA = +25C, receivers idle, transmitters idle, FORCEON = GND, FORCEOFF = VCC FORCEOFF = GND, TA = +25C FORCEON = FORCEOFF = VCC, no load 1.0 10 A CONDITIONS MIN TYP MAX UNITS
Supply Current, Shutdown Supply Current, AutoShutdown Plus Disabled Input Logic Threshold Low Input Logic Threshold High Input Leakage Current Output Leakage Current Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance
1.0
10
A mA
0.5
2.0
LOGIC INPUTS AND RECEIVER OUTPUTS T_IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5.0V T_IN, FORCEON, FORCEOFF Receivers disabled IOUT = 1.6mA IOUT = -1.0mA VCC 0.6 -25 VCC = 3.3V VCC = 5.0V VCC = 3.3V VCC = 5.0V TA = +25C 3 0.6 0.8 1.2 1.5 1.5 1.8 0.3 5 7 2.4 2.4 VCC 0.1 25 2.0 2.4 0.01 0.05 1.0 10 0.4 0.8 V V A A V V
V V V V k
2
_______________________________________________________________________________________
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM
ELECTRICAL CHARACTERISTICS (continued)
(V CC = +3.0V to +5.5V; C1-C4 = 0.1F (tested at 3.3V 5%), C1-C4 = 0.22F (tested at 3.3V 10%), C1 = 0.047F and C2-C4 = 0.33F (tested at 5.0V 10%); TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25C.) PARAMETER AutoShutdown (FORCEON = GND, FORCEOFF = VCC) Receiver Input Threshold to INVALID Output High Receiver Input Threshold to INVALID Output Low INVALID Output Voltage Low INVALID Output Voltage High Receiver Positive or Negative Threshold to INVALID High (tINVH) Receiver Positive or Negative Threshold to INVALID Low (tINVL) Receiver or Transmitter Edge to Transmitters Enabled (tWU) Receiver or Transmitter Edge to Shutdown (tAUTOSHDN) TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew RL = 3k, CL = 1000pF, one transmitter switching R_IN to R_OUT, CL = 150pF Normal operation Normal operation | tPHL - tPLH | | tPHL - tPLH | VCC = 3.3V, TA = +25C, RL = 3 to 7k, measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF CL = 150pF to 2500pF 6 tPHL tPLH 250 0.15 0.15 200 200 100 50 30 V/s 4 30 kbps s ns ns ns ns All transmitter outputs loaded with 3k to ground VCC = V+ = V- = GND, TOUT = 2V VCC 3.6V VCC > 3.6V VOUT = 12V, VCC = 0V to 5.5V, transmitters disabled 5.0 300 5.4 10M 35 40 60 100 25 V mA A Positive threshold Figure 7a Negative threshold Figure 4a IOUT = 1.6mA IOUT = -1.0mA VCC = 5V, Figure 4b VCC = 5V, Figure 4b VCC = 5V, Figure 4b (Note 2) Figure 4b (Note 2) 15 VCC 0.6 0.1 50 25 30 60 -2.7 -0.3 0.3 0.4 V V V s s s sec 2.7 V CONDITIONS MIN TYP MAX UNITS
MAX3238
Transition-Region Slew Rate
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
_______________________________________________________________________________________
3
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
__________________________________________Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k, TA = +25C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3238 TOC-01
SLEW RATE vs. LOAD CAPACITANCE
-SLEW +SLEW
MAX3238-02
SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA
MAX3238 TOC-03
7.5 TRANSMITTER OUTPUT VOLTAGE (V) 5.0 2.5 0 -2.5 -5.0 -7.5 0 1000 2000
VOUT+
14 12 SLEW RATE (V/s) 10 8 6 4 1 TRANSMITTER 250kbps 4 TRANSMITTERS 15.6kbps LOADED 3k + CL
70 60 SUPPLY CURRENT (mA) 50 40 30 20 10 0 20kbps 120kbps
250kbps
FOR DATA RATES UP TO 250kbps 1 TRANSMITTER 250kbps 4 TRANSMITTERS 15.6kbps LOADED 3k + CL VOUT-
2 0 3000 4000 5000 0 LOAD CAPACITANCE (pF) 2000 4000 1000 3000 LOAD CAPACITANCE (pF) 5000
0
2000 4000 1000 3000 LOAD CAPACITANCE (pF)
5000
______________________________________________________________Pin Description
PIN NAME C2+ GND C2VT_OUT R_IN FORCEON FUNCTION Positive Terminal of Inverting Charge-Pump Capacitor Ground Negative Terminal of Inverting Charge-Pump Capacitor -5.5V Generated by the Charge Pump RS-232 Transmitter Outputs (T1OUT-T5OUT) RS-232 Receiver Inputs (R1IN-R3IN) Force-Off Input. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). Force-Off Input. Drive low to shut down transmitters, receivers (except R1OUTB), and onboard supply. This overrides AutoShutdown Plus and FORCEON (Table 1). Output of the Valid Signal Detector. A logic "1" indicates if a valid RS-232 level is present on receiver inputs. Noninverting Complementary Receiver Output. Always active. TTL/CMOS Transmitter Inputs (T5IN-T1IN) TTL/CMOS Receiver Outputs (R3OUT-R1OUT) Negative Terminal of Voltage-Doubler Charge-Pump Capacitor +3.0V to +5.5V Supply Voltage +5.5V Generated by the Charge Pump Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
1
2 3 4 5, 6, 7, 10, 12 8, 9, 11 13
14
FORCEOFF
15 16 17, 19, 22, 23, 24 18, 20, 21 25 26 27 28
INVALID R1OUTB T_IN R_OUT C1VCC V+ C1+
4
_______________________________________________________________________________________
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
Table 1. Output Control Truth Table
FORCEON
FORCEOFF
0
AUTOSHUTDOWN PLUS* X
OPERATION STATUS Shutdown (Forced Off) Normal Operation (Forced On) Normal Operation (AutoShutdown Plus) Shutdown (AutoShutdown Plus)
T_OUT
R_OUT
R1OUTB
X
High-Z
High-Z
Active
1
1
X
Active
Active
Active
0
1
<30sec*
Active
Active
Active
0
1
>30sec*
High-Z
Active
Active
X = Don't Care * Time since last receiver or transmitter input transition.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3238'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), regardless of the input voltage (VCC) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode: if the output voltages are less than 5.5V, the charge pumps are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.
When FORCEOFF is driven to ground, the transmitters and receivers are disabled and the outputs go high impedance, except for R1OUTB. When the AutoShutdown 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, but the receivers remain active. When the power is off, the MAX3238 permits the outputs to be driven up to 12V. The transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. All receivers have inverting three-state outputs and are inactive in shutdown (FORCEOFF) (Table 1). The MAX3238 also features an extra, alwaysactive noninverting output, R1OUTB. This extra output monitors receiver activity while the other receivers are high impedance, allowing Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where VCC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).
RS-232 Transmitters
The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3238 transmitters guarantee a 250kbps data rate with worst-case loads of 3k in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLinkTM). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection.
LapLink is a trademark of Traveling Software.
_______________________________________________________________________________________
5
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER VCC FORCEOFF FORCEON INVALID PROTECTION DIODE
MAX3238
T1
VCC Rx UART I
PREVIOUS RS-232
5k Tx
T2 T3 I/O CHIP WITH UART GND T4 RS-232 T5 R1 VCC R2 TO P R3 LOGIC TRANSITION DETECTOR SHDN = GND
CPU
(a)
OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
I PROTECTION DIODE
MAX3238
Figure 1. Interface Under Control of PMU
VCC
R1OUTB
AutoShutdown Plus Mode
1A supply current is achieved with Maxim's AutoShutdown Plus feature, which operates when FORCEOFF is low and FORCEON is high. When the MAX3238 senses no valid signal transitions on all receiver and transmitter inputs for 30sec, the on-board power supply and drivers are shut off, reducing supply current to 1A. This occurs if the RS-232 cable is disconnected or if the connected peripheral transmitters are turned off. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. The INVALID output is high when the receivers are active. Since INVALID indicates the receiver inputs' condition, it can be used in any mode (Figure 3).
UART
Rx
R1OUT THREE-STATED 5k
R1IN
Tx GND
T1IN FORCEOFF = GND
T1OUT
(b)
NEW MAX3238: IN SHUTDOWN, R1OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R1OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE.
Figure 2. The MAX3238 detects RS-232 activity when the UART and interface are shut down.
6
_______________________________________________________________________________________
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM
Table 2. INVALID Truth Table
RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT Yes No
MAX3238
+0.3V
INVALID OUTPUT
H L
R_IN
-0.3V
30s TIMER R
INVALID
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30s.
Figure 3a. INVALID Functional Diagram, INVALID Low
Tables 1 and 2 and Figure 3 summarize the MAX3238's operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is asserted, the IC enters AutoShutdown Plus mode and 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+ decays to VCC, V- decays to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 25s (Figure 4b).
+2.7V
R_IN
-2.7V
30s TIMER R
INVALID
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30s.
Figure 3b. INVALID Functional Diagram, INVALID High
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 feature so the line acts like a SHDN input.
T_IN EDGE DETECT FORCEOFF S 30sec TIMER R
__________Applications Information
R_IN
AUTOSHDN
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 0.1F capacitors for 3.3V operation. For other supply voltages, see Table 3 for required capacitor values. Do not use values 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, and CBYPASS, to maintain the proper ratios (C1 to the other capacitors).
EDGE DETECT
FORCEON
Figure 3c. AutoShutdown Plus Logic
FORCEOFF
POWERDOWN*
FORCEON AUTOSHDN
* POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3d. Power-Down Logic
_______________________________________________________________________________________
7
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-.
INVALID HIGH +2.7V RECEIVER INPUT LEVELS INDETERMINATE +0.3V 0V -0.3V INDETERMINATE -2.7V INVALID HIGH
INVALID LOW
Table 3. Required Minimum Capacitance Values
VCC (V) 3.0 to 3.6 3.15 to 3.6 4.5 to 5.5 3.0 to 5.5 C1 (F) 0.22 0.1 0.047 0.22 C2, C3, C4, CBYPASS (F) 0.22 0.1 0.33 1
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
INVALID REGION RECEIVER INPUTS VOLTAGE TRANSMITTER INPUTS VOLTAGE TRANSMITTER OUTPUTS VOLTAGE INVALID OUTPUT VCC 0 V+ VCC 0 V* ALL RECEIVERS/TRANSMITTERS INACTIVE ** ANY ONE RECEIVER/TRANSMITTER BECOMES ACTIVE INVL tAUTOSHDN tAUTOSHDN tWU tWU
*
**
FORCEON = GND, FORCEOFF = VCC
Figure 4b. AutoShutdown Plus and INVALID Timing Diagram
8
_______________________________________________________________________________________
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM
Power-Supply Decoupling
In applications that are sensitive to power-supply noise, decouple VCC to ground with a capacitor of the same value as capacitors C2, C3, and C4. Connect the bypass capacitor as close to the IC as possible.
Interconnection with 3V and 5V Logic
The MAX3238 can directly interface with various 5Vlogic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections.
MAX3238
Transmitter Outputs when Exiting Shutdown
Figure 5 shows two transmitter outputs when exiting shutdown mode. As they become active, the outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each transmitter is loaded with 3k in parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.
Table 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM POWERSUPPLY VOLTAGE (V) 3.3 VCC SUPPLY VOLTAGE (V) 3.3 5
COMPATIBILITY
Compatible with all CMOS families. Compatible with all TTL and CMOS families. Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS.
High Data Rates
The MAX3238 maintains the RS-232 5.0V minimum transmitter output voltage even at high data rates. Figure 6 shows a transmitter loopback test circuit. Figure 7 shows a loopback test result at 120kbps, and Figure 8 shows the same test at 250kbps. For Figure 7, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 8, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.
5
5
3.3
VCC
VCC C1+ C1 FORCEON = FORCEOFF T2OUT C2 C2C1C2+ V+ C3*
2V/div
MAX3238
VC4
T_ IN 2V/div R_ OUT T1OUT VCC = 3.3V C1 - C4 = 0.1F 5s/div VCC
T_ OUT
R_ IN 5k
FORCEON FORCEOFF
1000pF
GND
Figure 5. Transmitter Outputs when Exiting Shutdown or Powering Up
*C3 CAN BE RETURNED TO VCC OR GND.
Figure 6. Loopback Test Circuit
_______________________________________________________________________________________
9
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
T1IN
5V 0V
T1IN
5V 0V
+5V T1OUT 0V -5V T1OUT
+5V 0V -5V 5V 0V
5V R1OUT 0V VCC = 3.3V C1 - C4 = 0.1F CLOAD = 1000pF 2s/div R1OUT
VCC = 3.3V C1 - C4 = 0.1F CLOAD = 1000pF
2s/div
Figure 7. Loopback Test Result at 120kbps
Figure 8. Loopback Test Result at 250kbps
___________________Chip Information
TRANSISTOR COUNT: 1404
10
______________________________________________________________________________________
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
__________Typical Operating Circuit
0.1F 26 VCC
28 C1+ 0.1F 25 C1-
V+ 27
* 0.1F
MAX3238
1 C2+ 0.1F 3 C224 T1IN 23 T2IN 22 T3IN 19 T4IN 17 T5IN 14 FORCEOFF AUTOSHUTDOWN PLUS 13 FORCEON 16 R1OUTB INVALID 15 T1OUT 5 T2OUT 6 T3OUT 7 T4OUT 10 T5OUT 12 V- 4 0.1F
T1 T2 T3 T4 T5
LOGIC INPUTS
RS-232 OUTPUTS
21 R1OUT
R1
R1IN 8 5k
LOGIC OUTPUTS 20 R2OUT R2
R2IN 9 5k
RS-232 INPUTS
18 R3OUT
R3
R3IN 11 5k
GND 2
*C3 MAY BE RETURNED TO EITHER VCC OR GND.
______________________________________________________________________________________
11
+3.0V to +5.5V, 1A, up to 250kbps, True RS-232 Transceiver with AutoShutdown PlusTM MAX3238
________________________________________________________Package Information
DIM A A1 B C D E e H L INCHES MILLIMETERS MIN MAX MIN MAX 0.068 0.078 1.73 1.99 0.002 0.008 0.05 0.21 0.010 0.015 0.25 0.38 0.004 0.008 0.09 0.20 SEE VARIATIONS 0.205 0.209 5.20 5.38 0.0256 BSC 0.65 BSC 0.301 0.311 7.65 7.90 0.025 0.037 0.63 0.95 0 8 0 8 INCHES MILLIMETERS MAX MIN MAX MIN 6.33 0.239 0.249 6.07 6.33 0.239 0.249 6.07 7.33 0.278 0.289 7.07 8.33 0.317 0.328 8.07 0.397 0.407 10.07 10.33
21-0056A
E
H
C
L
DIM PINS
e
A B D
A1
SSOP SHRINK SMALL-OUTLINE PACKAGE
D D D D D
14 16 20 24 28
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.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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