SN74ALS869DWE4

Counter Dividers Overview

The SN74ALS869DWE4 is a synchronous 8-bit up/down binary counter manufactured by Texas Instruments. It features internal-carry look-ahead circuitry for high-speed cascading and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports clock frequencies up to 35 MHz with propagation delays ranging from 3 ns to 16 ns depending on the signal path. It utilizes an ALS logic series and is housed in a 24-pin Small-Outline (DW) package, suitable for surface-mount applications.

Counter Dividers Feature Summary

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

Counter Dividers Applications

• High-speed synchronous counting applications requiring internal carry look-ahead
• Cascaded multi-bit counter systems utilizing ripple-carry outputs
• Digital systems requiring fully programmable presettable binary counting

Counter Dividers Procurement Notes

Verify the specific ordering suffix 'E4' indicates lead-free compliance and RoHS status as documented in the packaging addendum. Confirm the DW package variant matches the required surface-mount footprint. Ensure the component meets the standard commercial temperature range specifications defined for this part number.

Counter Dividers Selection Notes

Select this component when synchronous counting with internal carry look-ahead is required for high-speed designs. It differs from the SN74ALS867A variant by providing synchronous clear functionality rather than asynchronous clear. Consider the 35 MHz maximum clock frequency limit and the 24-pin SOIC package constraints during PCB layout.

Counter Dividers Part Context

This device belongs to the SN74ALS family of logic components produced by Texas Instruments. It is functionally related to the SN74ALS867A, which shares similar architecture but provides asynchronous clear instead of synchronous clear. Both are part of the broader SN54AS/SN74AS and SN54ALS/SN74ALS product lines designed for advanced low-power Schottky applications.

Counter Dividers Replacement Considerations

SN74ALS867ADW serves as a functional substitute with identical pinout and logic, differing only in having asynchronous clear instead of synchronous clear.