Single-Chip and Single-Supply Interface for

IBM PC/ATE Serial Port

Meets or Exceeds the Requirements of

TIA/EIA-232-F and ITU v.11 Standards

Operates With 3.3-V or 5-V Supplies

One Receiver Remains Active During

Standby (Wake-up Mode)

Designed to Operate at 128 kbit/s Over a

3-m Cable

Low Standby Current . . . 5 mA Max

ESD Protection on RS-232 Pins Meets or

Exceeds 4 kV (HBM) and 1.5 kV (HBM) on

All Pins Per MIL-STD-883, Method 3015

External Capacitors . . . 0.1 mF

(VCC = 3.3 V . . . Five External Capacitors)

(VCC = 5 V . . . Four External Capacitors)

Accepts 5-V Logic Input With 3.3-V Supply

Applications

– RS-232 Interface

– Battery-Powered Systems, PDAs

– Notebook, Laptop, and Palmtop PCs

– External Modems and Hand-Held

Terminals

Packaged in Shrink Small-Outline Package

description

The SN75LV4737A‡ consists of three line drivers, five line receivers, and a charge-pump circuit. It provides the

electrical interface between an asynchronous communication controller and the serial-port connector, and

meets the requirements of TIA/EIA-232-F. This combination of drivers and receivers matches those needed for

the typical serial port used in an IBM PC/AT or compatibles. The charge pump and five small external capacitors

allow operation from a single 3.3-V supply, and four capacitors allow operation from a 5-V supply.

The device has flexible control options for power management when the serial port is inactive. A common

disable for all of the drivers and receivers is provided with the active-high STBY input. The active-low EN input

is an enable for one receiver to implement a wake-up feature for the serial port. All the logic inputs can accept

signals from controllers operating from a 5-V supply, even though the SN75LV4737A is operating from 3.3 V.

The SN75LV4737A is characterized for operation over the temperature range of 0°C to 70°C.