FEATURES

Controlled Baseline

– One Assembly/Test Site, One Fabrication

Site

Extended Temperature Performance of -55°C

to 125°C

Enhanced Diminishing Manufacturing

Sources (DMS) Support

Enhanced Product-Change Notification

Qualification Pedigree (1)

Single-Chip and Single-Supply Interface

for IBM™ PC/AT™ Serial Port

RS-232 Bus-Pin ESD Protection Exceeds

±15 kV Using Human-Body Model (HBM)

D Meets or Exceeds the Requirements of

TIA/EIA-232-F and ITU v.28 Standards

Operates With 3-V to 5.5-V VCC Supply

Three Drivers and Five Receivers

Low Standby Current . . . 1 mA Typical

External Capacitors . . . 4 ´ 0.1 mF

Accepts 5-V Logic Input With 3.3-V Supply

Always-Active Noninverting Receiver

Output (ROUT2B)

Serial-Mouse Driveability

Auto-Powerdown Feature to Disable Driver

Outputs When No Valid RS-232 Signal Is

Sensed

Applications

– Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and

Hand-Held Equipment

DESCRIPTION

The MAX3243 consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD

(HBM) protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of

TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the

serial-port connector. This combination of drivers and receivers matches that needed for the typical serial port

used in an IBM PC/AT or compatible. The charge pump and four small external capacitors allow operation from

a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT2B),

which allows applications using the ring indicator to transmit data while the device is powered down.