Overview

Part: MAX3222/MAX3232/MAX3237/MAX3241 from Maxim Integrated Products, Inc.

Type: True RS-232 Transceivers

Key Specs:

Supply Voltage: 3.0V to 5.5V
Data Rate: Up to 1Mbps (MAX3237), 120kbps (MAX3222, MAX3232, MAX3241)
Shutdown Supply Current: 1µA (MAX3222, MAX3237, MAX3241)
External Capacitors: Four 0.1µF
Transmitter Output Voltage Swing: ±5.0V (min)

Features:

Proprietary low-dropout transmitter output stage
Dual charge pump
Pin, package, and functionally compatible with industry-standard MAX242 and MAX232 (MAX3222, MAX3232)
Always-On Extra Outputs for monitoring external devices (MAX3237/MAX3241)
Integrated charge pump circuitry eliminates the need for a bipolar ±12V supply
Wide single-supply operation

Applications:

Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Datacom Equipment

Package:

20 TSSOP
20 SSOP
18 SO
18 Plastic Dip

Features

Integrated Features Saves Board Space and Simplifies Design
- Charge Pump Circuitry Eliminates the Need for a Bipolar ±12V Supply
- Wide Single-Supply Operation From +3V to +5.5V Supply
- Always-On Extra Outputs Enable Monitoring of External Devices
Power Saving Extends Battery Life
- 1µA Supply Current in Shutdown Mode While Receiver is Active (MAX3222, MAX3237, MAX3241)

Applications

Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Datacom Equipment

Ordering Information continued at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

Pin Configuration

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; and other patents pending.

Electrical Characteristics

(VCC = +3.0V to +5.5V, C1–C4 = 0.1μF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

| PARAMETER | CONDITIONS | | | TYP | MAX | UNITS | |---------------------------------------|------------------------------|-----------------------------|--------------|--------------|-----|-------|--| | DC CHARACTERISTICS | | VCC Power-Supply Current | No load, VCC = 3.3V or 5.0V, | MAX3222/MAX3232/
MAX3241 | | 0.3 | 1.0 | mA | | | TA = +25°C | MAX3237 | | 0.5 | 2.0 | | Shutdown Supply Current | SHDN = GND, TA = +25°C | | | 1.0 | 10 | µA | | LOGIC INPUTS AND RECEIVER OUTPUTS | | Input Logic Threshold Low
(Note 3) | T_IN, EN, SHDN, MBAUD | | | | 0.8 | V | | Input Logic Threshold High | VCC = 3.3V | | 2.0 | | (Note 3) | VCC = 5.0V | | | | | V | | Input Leakage Current | T_IN, EN, SHDN, MBAUD | | | | | µA | | Output Leakage Current | Receivers disabled | | | | | µA | | Output Voltage Low | IOUT = 1.6mA | | | | 0.4 | V | | Output Voltage High | IOUT = -1.0mA | | VCC -
0.6 | VCC
- 0.1 | | V | | RECEIVER INPUTS | | Input Voltage Range | | | -25 | | 25 | V | | | | VCC = 3.3V | 0.6 | 1.2 | | Input Threshold Low | TA = +25°C | VCC = 5.0V | 0.8 | 1.5 | | V | | | | VCC = 3.3V | | 1.5 | 2.4 | | Input Threshold High | TA = +25°C
VCC = 5.0V | | | 1.8 | 2.4 | V |

Absolute Maximum Ratings

	VCC0.3V 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, SHDN, EN0.3V to +6V
	MBAUD0.3V to (VCC + 0.3V)
	R_IN±25V
Output Voltages
	T_OUT±13.2V
	R_OUT0.3V to (VCC + 0.3V)
Short-Circuit Duration
	T_OUTContinuous

Note 1: V+ and V- can have a maximum magnitude 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

(VCC = +3.0V to +5.5V, C1–C4 = 0.1μF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

| PARAMETER | CONDITIONS | | | TYP | MAX | UNITS | |---------------------------------------|------------------------------|-----------------------------|--------------|--------------|-----|-------|--| | DC CHARACTERISTICS | | VCC Power-Supply Current | No load, VCC = 3.3V or 5.0V, | MAX3222/MAX3232/
MAX3241 | | 0.3 | 1.0 | mA | | | TA = +25°C | MAX3237 | | 0.5 | 2.0 | | Shutdown Supply Current | SHDN = GND, TA = +25°C | | | 1.0 | 10 | µA | | LOGIC INPUTS AND RECEIVER OUTPUTS | | Input Logic Threshold Low
(Note 3) | T_IN, EN, SHDN, MBAUD | | | | 0.8 | V | | Input Logic Threshold High | VCC = 3.3V | | 2.0 | | (Note 3) | VCC = 5.0V | | | | | V | | Input Leakage Current | T_IN, EN, SHDN, MBAUD | | | | | µA | | Output Leakage Current | Receivers disabled | | | | | µA | | Output Voltage Low | IOUT = 1.6mA | | | | 0.4 | V | | Output Voltage High | IOUT = -1.0mA | | VCC -
0.6 | VCC
- 0.1 | | V | | RECEIVER INPUTS | | Input Voltage Range | | | -25 | | 25 | V | | | | VCC = 3.3V | 0.6 | 1.2 | | Input Threshold Low | TA = +25°C | VCC = 5.0V | 0.8 | 1.5 | | V | | | | VCC = 3.3V | | 1.5 | 2.4 | | Input Threshold High | TA = +25°C
VCC = 5.0V | | | 1.8 | 2.4 | V |