MAX3243 3V to 5.5V Multichannel RS-232 Line Driver and Receiver With ±15kV ESD

(HBM) Protection

1 Features

• Operates with 3V to 5.5V VCC supply

• Single-chip and single-supply interface

for IBM™ PC/AT™ serial port

• RS-232 Bus-pin ESD protection of

±15kV Using Human-Body Model (HBM)

• Meets or exceeds the requirements of

TIA/EIA-232-F and ITU V.28 standards

• Three drivers and five receivers

• Operates up to 250kbit/s

• Low active current: 300μA typical

• Low standby current: 1μA typical

• External capacitors: 4 × 0.1μF

• Accepts 5V logic input with 3.3V supply

• Always-active noninverting receiver

output (ROUT2B)

• Operating temperature

– MAX3243C: 0°C to 70°C

– MAX3243I: –40°C to 85°C

• Serial-mouse driveability

• Auto-powerdown feature to disable driver

outputs when no valid RS-232 signal is

sensed

2 Applications

• Battery-powered systems

• Tablets

• Notebooks

• Laptops

• Hand-held equipment

3 Description

The MAX3243 device consists of three line drivers,

five line receivers which is ideal for DE-9 DTE

interface. ±15kV ESD (HBM) protection pin to pin

(serial- port connection pins, including GND). Flexible

power features saves power automatically. Special

outputs ROUT2B and INVALID are always enabled

to allow checking for ring indicator and valid RS232

input.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

MAX3243

SSOP (28)

10.2mm × 7.8mm

SOIC (28)

17.9mm × 10.3mm

TSSOP (28)

9.7mm × 6.4mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

RX

TX

POWER

3.3 V, 5 V

DIN

ROUT

DOUT

RS232

RIN

RS232

3

3

5

5

FORCEON

FORCEOFF

STATUS

INVALID

Simplified Diagram

MAX3243

SLLS350Q – APRIL 1999 – REVISED AUGUST 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.