74F269SC

Overview

The onsemi 74F269SC is an obsolete 8-bit bidirectional binary counter housed in a 24-lead Small Outline Integrated Circuit (SOIC) package. It features synchronous counting and loading, with all state changes initiated by the rising edge of the clock. The device supports parallel data inputs for programmable preset capability and includes built-in lookahead carry for easy cascading. A U/D input controls the direction of counting. Recommended operating conditions specify a supply voltage range of +4.5V to +5.5V and an ambient temperature range of 0°C to +70°C.

Feature Summary

• Synchronous counting and loading mechanism where all state changes are triggered by the rising edge of the clock signal.
• Built-in lookahead carry capability designed to facilitate easy cascading of multiple units.
• Programmable operation enabled through parallel data inputs that allow presetting the counter value.

Applications

• Bidirectional binary counting operations
• Cascaded multi-stage digital counters
• Programmable preset applications

Procurement Notes

Verify component obsolescence status as this part is discontinued by Fairchild Semiconductor. Confirm availability of direct substitutes or alternative manufacturers offering equivalent logic families. Ensure compatibility with existing PCB footprints and design specifications before finalizing procurement decisions.

Selection Notes

Select this component only if legacy system compatibility requires the specific 74F series logic family characteristics. Evaluate the need for synchronous bidirectional counting with lookahead carry features. Consider the 24-lead SOIC package constraints and verify that the standard TTL input/output levels meet the interface requirements of the target circuit.

Part Context

This component belongs to the 74F series of high-speed transistor-transistor logic devices originally manufactured by Fairchild Semiconductor. The 74F269 specifically provides an 8-bit bidirectional counter function within this established logic family lineage.

Replacement Considerations

Direct substitute part numbers include SN74F74D and SN74F74DR from Texas Instruments. Verify functional equivalence and pinout compatibility when transitioning to these alternatives.