SN74ALS869DW

Counter Dividers Overview

The SN74ALS869DW is a synchronous 8-bit up/down binary counter from the Texas Instruments ALS logic family, housed in a 24-pin Small-Outline (SOIC) package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports clock frequencies up to 35 MHz. The device features internal carry look-ahead circuitry for high-speed cascading applications. Key control inputs include ENP, ENT, S0, and S1, while outputs consist of QA through QH and a ripple-carry output (RCO). It utilizes a buffered CLK input that triggers flip-flops on the rising edge.

Counter Dividers Feature Summary

• Synchronous operation with simultaneous flip-flop triggering eliminates counting spikes associated with asynchronous counters.
• Internal carry look-ahead circuitry enables efficient n-bit cascading without additional external gating.
• Fully programmable architecture allows parallel loading of any value between 0 and 255 via synchronous load mode.
• Directional control is managed by independent select inputs, supporting both up and down counting sequences.

Counter Dividers Applications

• High-speed synchronous counting applications requiring internal carry lookahead
• Cascaded multi-stage digital counter systems
• Programmable presettable counting circuits

Counter Dividers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm the exact pin count, lead finish, and moisture sensitivity level. Ensure the selected variant matches the required operating temperature range and RoHS compliance status for your assembly process.

Counter Dividers Selection Notes

Select this component when synchronous counting with minimal propagation delay is required. The ALS series offers lower power consumption compared to standard TTL. Verify that the system design accommodates the 24-pin SOIC footprint and that the 35 MHz maximum clock frequency meets the application timing requirements.

Counter Dividers Part Context

This part belongs to the SN74ALS86x family of synchronous 8-bit counters. It shares functional similarities with the SN74ALS867A but differs in clear mechanism; the SN74ALS869 utilizes synchronous clear, whereas the SN74ALS867A provides asynchronous clear. Both variants support identical counting and loading functions within the same package constraints.

Counter Dividers Replacement Considerations

SN74ALS867ADW serves as a functional alternative if asynchronous clearing is preferred over synchronous clearing. SN74AS869DW is available for applications requiring higher speed performance, though it exhibits significantly higher power consumption than the ALS variant.