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.
