74F163ASCX

Overview

The Fairchild Semiconductor 74F163ASCX is a high-speed synchronous modulo-16 binary counter housed in a 16-SOIC package. It operates on a positive-edge triggered clock with a typical count frequency of 120 MHz and a supply voltage range of 4.5 V to 5.5 V. The device features synchronous presettable loading, two count enable inputs, and a terminal count output for multi-stage expansion. Unlike the asynchronous reset variant, it utilizes a synchronous reset input that clears outputs on the clock edge.

Feature Summary

• Synchronous counting and parallel loading capabilities
• High-speed synchronous expansion via look-ahead carry
• Synchronous reset function overriding counting and loading

Applications

• Programmable frequency dividers
• Synchronous multi-stage counter systems
• Digital timing and sequencing circuits

Procurement Notes

Verify component authenticity as this part is obsolete. Confirm pin compatibility with direct substitutes like SN74F163AD or SN74F163ADR from Texas Instruments. Ensure the replacement matches the 16-SOIC package and TTL logic levels. Check RoHS compliance status if required by current manufacturing standards.

Selection Notes

Select this component for applications requiring precise synchronous control over counting states. The synchronous reset feature allows predictable state changes aligned with the clock cycle. Consider the 120 MHz speed rating for high-frequency digital designs. Verify that the 16-SOIC footprint fits the target PCB layout constraints.

Part Context

This component belongs to the 74F series of high-speed TTL logic devices. It is functionally related to the 74F161A but differs by having a synchronous rather than asynchronous master reset. The 'CX' suffix typically denotes tape and reel packaging for surface-mount assembly.

Replacement Considerations

Direct pin-compatible substitutes include SN74F163AD and SN74F163ADR from Texas Instruments.