The DS89C21 is a differential CMOS line driver and receiver pair, designed to meet the
requirements of TIA/EIA-422-A (RS-422) electrical characteristics interface standard. The DS89C21
provides one driver and one receiver in a minimum footprint. The device is offered in an 8-pin SOIC
The CMOS design minimizes the supply current to 6 mA, making the device ideal for use in
battery powered or power conscious applications.
The driver features a fast transition time specified at 2.2 ns, and a maximum
differential skew of 2 ns making the driver ideal for use in high speed applications operating
above 10 MHz.
The receiver can detect signals as low as 200 mV, and also incorporates hysteresis for
noise rejection. Skew is specified at 4 ns maximum.
The DS89C21 is compatible with TTL and CMOS levels (DI and RO).
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