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.