1FEATURES
2• Meets TIA/EIA-422-A (RS-422) and CCITT V.11
Recommendation
• LOW POWER Design—15 mW Typical
• Guaranteed AC Parameters:
– Maximum Driver Skew 2.0 ns
– Maximum Receiver Skew 4.0 ns
• Extended Temperature Range: −40°C to
+85°C
• Available in SOIC Packaging
• Operates over 20 Mbps
• Receiver OPEN Input Failsafe Feature

DESCRIPTION
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 package.
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).