SN74HC688DWRG4

Overview

The SN74HC688DWRG4 is an 8-bit identity comparator from Texas Instruments, housed in a 20-SOIC surface-mount package. It compares two 8-bit binary or BCD words to determine equality (A=B). The device operates within a supply voltage range of 2 V to 6 V and supports an industrial temperature range of -40°C to +85°C. Key electrical parameters include a maximum propagation delay of 36 ns at 6 V with 50 pF load, quiescent current of 8 µA, and output drive currents of ±5.2 mA. Outputs are active low.

Feature Summary

• Performs direct comparison of two 8-bit binary or BCD input words to verify identity.
• Features an output-enable input that forces outputs to a high-impedance state when inactive.
• Provides active-low logic outputs indicating the equality status of the input data words.

Applications

• Digital systems requiring precise equality verification of 8-bit data streams
• Memory address decoding and validation circuits
• Data integrity checking in communication interfaces

Procurement Notes

Verify the G4 suffix indicates lead-free and RoHS compliance per Texas Instruments standards. Confirm the SOIC-20 package dimensions match your PCB footprint requirements. Ensure the industrial temperature grade (-40°C to +85°C) aligns with your operational environment specifications before finalizing procurement.

Selection Notes

Select this component for applications requiring high-speed 8-bit magnitude comparison with low power consumption. The HC technology offers compatibility with standard CMOS logic families. Consider the 20-SOIC package for surface-mount assembly needs. Verify that the 2 V to 6 V operating range suits your system's power supply architecture.

Part Context

This part belongs to the SN74HC688 family of 8-bit identity comparators manufactured by Texas Instruments. It is designed for general-purpose digital logic applications where comparing two 8-bit values is necessary. The device is part of the broader 74HC series, known for high-speed operation and low power dissipation in CMOS technology.

Replacement Considerations

SN74HC688DWRE4 is a verified equivalent variant within the same product line. Both parts share identical functional specifications and pinouts. Verify package compatibility and ensure the replacement meets the same industrial temperature and RoHS requirements as the original design intent.