SN74HC688PWT

Overview

The SN74HC688PWT is an 8-bit identity comparator manufactured by Texas Instruments, designed for comparing two 8-bit binary or BCD words. It operates within a supply voltage range of 2 V to 6 V and features active low outputs. The device utilizes TSSOP-20 packaging suitable for surface mount applications. Key electrical parameters include propagation delays of 210 ns, 42 ns, and 36 ns, with an operating temperature range spanning from -40°C to +85°C.

Feature Summary

• Performs identity comparisons between two 8-bit binary or BCD words
• Features an output-enable input to control signal states
• Provides active low logic outputs for direct interfacing

Applications

• Digital data validation systems
• Memory address matching circuits
• Control logic verification

Procurement Notes

Verify the specific suffix 'PWT' against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Confirm RoHS compliance status as indicated in official documentation. Check for end-of-life notices, as this component may be scheduled for obsolescence. Ensure compatibility with your PCB footprint and reflow soldering profile requirements before finalizing procurement decisions.

Selection Notes

Select this component when 8-bit equality checking is required within HC CMOS logic families. Consider the TSSOP-20 package constraints for board space. Evaluate the 2V to 6V supply range against system power rails. Compare propagation delay characteristics against timing requirements of the target application circuit to ensure signal integrity.

Part Context

This part belongs to the SN74HC688 series of 8-bit identity comparators. It is functionally related to other variants such as SN74HC688PWRE4 and SN74HC688PWR, differing primarily in packaging or reel specifications. The series provides standardized digital comparison capabilities for high-speed CMOS applications.

Replacement Considerations

Direct substitutes include SN74HC688PWRE4 and SN74HC688PWR. Verify pinout compatibility and electrical specifications before substitution. Note that CD74HCT688EE4 offers similar functionality but differs in voltage range and package type.