DS89C21TM

Overview

The DS89C21TM is a differential CMOS line driver and receiver pair designed to meet TIA/EIA-422-A (RS-422) and CCITT V.11 interface standards. It integrates one driver and one receiver in an 8-pin SOIC package. The device operates with a supply voltage range of 4.50V to 5.50V and supports temperatures from -40°C to +85°C. Typical supply current is 6mA, consuming 15mW. Driver propagation delay is 10ns maximum, with transition times of 2.2ns. Receiver sensitivity detects signals as low as 200mV with hysteresis for noise rejection.

Feature Summary

• Low power consumption suitable for battery-powered applications
• High-speed operation supporting data rates above 10 MHz
• Receiver open input failsafe feature ensures defined output states

Applications

• Battery-powered communication systems
• High-speed serial data transmission links
• Industrial RS-422 network interfaces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm availability status and packaging details. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing process. Ensure proper ESD handling procedures are followed during storage and installation to prevent damage to the MOS gates.

Selection Notes

Select this component when a compact RS-422 transceiver solution is required for power-constrained designs. Verify that the operating temperature range of -40°C to +85°C aligns with your environmental specifications. Ensure compatibility with TTL or CMOS logic levels for both driver inputs and receiver outputs.

Part Context

The DS89C21 belongs to the DS89C21 series of differential CMOS line drivers and receivers. It serves as a single-driver, single-receiver unit within Texas Instruments' portfolio of interface integrated circuits. This part provides a minimal footprint alternative for standard RS-422 applications requiring high speed and low power.

Replacement Considerations

DS89C21TM/NOPB

FAQ

What is the minimum detectable signal voltage for the receiver?

The receiver can detect differential input signals as low as 200 mV.

Does the device include protection against open receiver inputs?

Yes, the receiver incorporates an open input failsafe feature that ensures a defined output state when inputs are non-terminated.

What is the typical supply current for the DS89C21TM?

The typical supply current is 6 mA, resulting in a typical power dissipation of 15 mW.