SN74ALS520DWRE4

Comparators Overview

The SN74ALS520DWRE4 is an obsolete octal binary/BCD identity comparator from Texas Instruments' ALS series. It features eight independent comparators with active-low outputs indicating equality (A=B). The device operates within a 4.5 V to 5.5 V supply range and utilizes a 20-SOIC package. Propagation delays are specified at 12 ns, 20 ns, and 22 ns. Maximum supply current is 19 mA, with output currents of -2.6 mA (high) and 24 mA (low). It supports surface-mount installation and functions between 0°C and +70°C.

Comparators Feature Summary

• Provides eight independent identity comparison channels for binary or BCD data
• Generates active-low logic signals when input pairs are equal
• Utilizes totem-pole output structure for standard digital interfacing

Comparators Applications

• Digital system data validation
• Memory address matching circuits
• Control logic equality verification

Comparators Procurement Notes

This component is officially marked as obsolete and no longer manufactured by Texas Instruments. Verification of availability requires checking authorized distributors for remaining stock or approved substitute part numbers. Direct procurement from the manufacturer is not possible. Ensure compatibility with existing designs before sourcing alternative components.

Comparators Selection Notes

Designers requiring this functionality should evaluate direct substitutes such as the SN74ALS520DW. Considerations include verifying pin compatibility, electrical characteristics, and package dimensions. The SN74ALS520N offers a through-hole alternative in a PDIP-20 package. Review datasheets for any functional differences between legacy and replacement parts.

Comparators Part Context

Part of the Texas Instruments SN74ALS520 family of octal identity comparators. The DWRE4 suffix indicates a specific tape-and-reel packaging variant of the SOIC-20 package. This series belongs to the Advanced Low-power Schottky (ALS) logic family, known for improved speed and power consumption compared to standard TTL equivalents.

Comparators Replacement Considerations

Direct substitute: SN74ALS520DW. Alternative package options include SN74ALS520N (PDIP-20). Verify that replacement parts maintain identical pinouts and electrical specifications to ensure seamless integration into existing hardware designs.