SN74ALS688DW

Comparators Overview

The SN74ALS688DW is an 8-bit identity comparator manufactured by Texas Instruments, designed for high-speed digital logic applications. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 20 ns at 5 V with 50 pF load. The device utilizes a 20-pin SOIC package and supports surface mount installation. It draws a maximum supply current of 19 mA and functions reliably across an operating temperature range of 0°C to +70°C.

Comparators Feature Summary

• Performs identity comparison between two 8-bit binary or BCD words
• Provides active-low output indicating equality (A = B)
• Features low-level output drive capability of 24 mA

Comparators Applications

• Digital data validation circuits
• Memory address matching systems
• Control logic equality checks

Comparators Procurement Notes

Verify the specific suffix 'DW' confirms the 20-SOIC package and commercial temperature grade. Confirm RoHS compliance status as manufacturing practices may vary by production batch. Ensure the source document explicitly lists this part number to avoid confusion with obsolete variants like SN74ALS688DWG4.

Comparators Selection Notes

Select this component when fast 8-bit identity comparison is required in standard 5V logic environments. The ALS technology offers a balance of speed and power consumption suitable for general-purpose digital systems. Verify that the 20-SOIC footprint matches the target PCB design constraints.

Comparators Part Context

This part belongs to the SN74ALS688 series of 8-bit identity comparators. It is functionally equivalent to other variants such as the through-hole SN74ALS688N but differs in packaging. The device is part of the broader 74ALS family of advanced low-power Schottky logic components.

Comparators Replacement Considerations

SN74ALS688DWR is listed as a manufacturer-recommended alternative for the discontinued SN74ALS688DWG4 variant.