The DS8922/22A and DS8923A are Dual Differential Line Driver and Receiver pairs. These
devices are designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive
Standards. In addition, the devices meet the requirements of the EIA Standard RS-422.
These devices offer an input sensitivity of 200 mV over a ±7V common mode operating
range. Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing
input waveforms. An input fail-safe circuit is provided such that if the receiver inputs are open
the output assumes the logical one state.
The DS8922A and DS8923A drivers are designed to provide unipolar differential drive to
twisted pair or parallel wire transmission lines. Complementary outputs are logically ANDed and
provide an output skew of 0.5 ns (typ.) with propagation delays of 12 ns.
Both devices feature TRI-STATE outputs. The DS8922/22A have independent control functions
common to a driver and receiver pair. The DS8923A has separate driver and receiver control
Power up/down circuitry is featured which will TRI-STATE the outputs and prevent
erroneous glitches on the transmission lines during system power up or power down operation.
The DS8922/22A and DS8923A are designed to be compatible with TTL and CMOS.
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