SN74AS867DW

Counter Dividers Overview

The SN74AS867DW is a synchronous 8-bit up/down counter manufactured by Texas Instruments in a 24-pin Small-Outline (DW) package. It features internal-carry look-ahead circuitry for high-speed cascading and fully programmable presettable loading between 0 and 255. The device operates on a positive-going clock edge with independent count-enable inputs (ENP, ENT). It supports bidirectional counting controlled by select inputs S0 and S1, providing an asynchronous clear function.

Counter Dividers Feature Summary

• Synchronous operation eliminates output counting spikes associated with ripple-clock counters
• Internal carry look-ahead circuitry enables n-bit cascading without additional gating
• Fully programmable parallel loading allows presetting to any value from 0 to 255
• Independent clock circuit simplifies system design and mode transitions

Counter Dividers Applications

• High-speed binary counting applications
• Cascaded multi-bit counter systems
• Programmable timing circuits
• Digital frequency division

Counter Dividers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm lead finish, moisture sensitivity level, and environmental compliance status. Ensure the component matches the required operating temperature range of 0°C to 70°C for the catalog version. Confirm RoHS compliance details directly with the supplier documentation prior to integration.

Counter Dividers Selection Notes

Select this component when synchronous counting with internal carry lookahead is required to minimize propagation delay in cascaded configurations. The AS series offers higher speed performance compared to standard TTL or ALS variants. Verify that the 24-pin SOIC package dimensions fit the target PCB layout constraints and that the power supply voltage aligns with the recommended 4.5V to 5.5V operating range.

Counter Dividers Part Context

This device belongs to the Texas Instruments SN74AS logic family, characterized by advanced Schottky technology for high-speed operation. It is part of a broader group including the SN74ALS867A and SN54AS867, differentiated primarily by speed, power consumption, and temperature ranges. The DW package variant provides a surface-mount solution suitable for automated assembly processes.

Counter Dividers Replacement Considerations

SN74ALS867ADW is documented as a similar alternative within the same datasheet family.