Quadruple Differential Line Receiver

The SN55173 and SN75173 are monolithic quadruple

differential line receivers with 3-state outputs. They are designed to meet the

requirements of TIA/EIA-422-B, TIA/EIA-423-B, TIA/EIA-485-A, and several ITU

recommendations. The standards are for balanced multipoint bus transmission at rates

up to 10 megabits per second. The four receivers share two OR enable inputs, one

active when high, the other active when low. These devices feature high input

impedance, input hysteresis for increased noise immunity, and input sensitivity of ±

200 mV over a common-mode input voltage range of – 12 V to 12 V. Fail-safe design

specifies that if the inputs are open circuited, the outputs are always high. The

SN65173 and SN75173 are designed for optimum performance when used with the SN75172

or SN75174 quad differential line drivers.

The SN55173 is characterized over the full

military temperature range of – 55°C to 125°C. The SN75173

is characterized for operation from 0°C to 70°C.