SN74HC688DW

Comparators Overview

The SN74HC688DW is an 8-bit identity comparator from the Texas Instruments HC logic family, housed in a 20-pin SOIC package. It performs comparisons of two 8-bit binary or BCD words, providing an active-low output when inputs are equal (A=B). The device operates on a supply voltage range of 2 V to 6 V and supports a maximum clock frequency of 66 MHz. Propagation delays vary with voltage: 210 ns at 2 V, 42 ns at 4.5 V, and 36 ns at 6 V, measured with a 50 pF load. Output currents reach ±5.2 mA, and it functions within a temperature range of -40 °C to +85 °C.

Comparators Feature Summary

• Performs equality comparison between two 8-bit binary or BCD data words
• Provides active-low output signal indicating input match status
• Includes output-enable input for controlling output state

Comparators Applications

• Digital system address matching
• Data validation circuits
• Control logic equality checks

Comparators Procurement Notes

Verify component authenticity through authorized channels as this part number may be obsolete. Confirm package integrity and pin alignment upon receipt. Check datasheet revisions for any functional updates. Ensure storage conditions meet specified humidity and temperature limits to prevent degradation before soldering.

Comparators Selection Notes

Select this component for designs requiring precise 8-bit equality detection within standard CMOS voltage ranges. Consider propagation delay specifications relative to system clock speeds. Evaluate thermal performance for high-temperature environments. Verify compatibility with existing logic families for seamless integration into current circuit architectures.

Comparators Part Context

Part of the SN74HC688 series identity comparators manufactured by Texas Instruments. This series provides reliable digital comparison capabilities for embedded systems. The HC logic family ensures compatibility with standard TTL levels while offering improved power consumption characteristics compared to older technologies.

Comparators Replacement Considerations

SN74HC688DWR is listed as a direct substitute. Verify pinout compatibility and electrical specifications before implementation. Ensure packaging differences do not affect board layout requirements.