GENERAL DESCRIPTION

The ADM1487 is an ultra-low power RS-485/RS-422 transceiver consisting of one driver and one receiver per package. Quiescent operating current is typically 80µA and 1µA in shutdown mode. The driver and receiver both have three-state outputs. This allows multiple drivers to be connected to an RS-485/RS-422 bus, or several receiver outputs to be connected to a serial data bus. The driver will maintain a high-impedance output state even with power off, while the receiver features fail-safe operation that guarantees a logic high output if the inputs are left open-circuit.

FEATURES

Low Power - 120µA Max ICC with Driver Disabled

High Input Impedance — Up to 256 Transceivers on Bus

Low-Current (1µA) Shutdown Mode

Slew Rate Control for Error-Free Data

Transmission and Low EMI

±10kV ESD Protection (Human Body Model) on

RS-485 I/O pins

Thermal Protection of Driver

Glitch-Free Driver Power-Up Allows Hot Connection

Driver Maintains High Output Impedance with Power

Off

Wide Common-Mode Range Allows ±7V Ground Differences Between Devices

Pin-Compatible with Industry Standard 75176

APPLICATIONS

Battery-Powered RS-485/RS-422 Systems

Level Translation