ADM1487

Obsolete

Ultralow Power RS-485/RS-422 Transceiver

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Overview

250 kbps data rate
Glitch-free driver power-up allows
hot connection
Driver maintains high output
impedance with power off
Low power—120 µA max ICC with driver disabled
High input impedance—up to 256 transceivers on bus

Wide common-mode range allows
±7 V ground differences between
devices
Low current (1 µA) shutdown mode
Pin compatible with industry
standard 75176
Slew rate control for error-free data transmission and low EMI
±10 kV ESD protection (human body model) on RS-485 I/O pins

The ADM1487 is an ultralow power RS-485/RS-422 transceiver consisting of one driver and one receiver per package. Quiescent operating current is typically 80 µA and 1 µA 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.

The device has slew rate limited drivers to minimize electromagnetic interference (EMI) and reduce reflections caused by incorrectly terminated cable.