74AC191SCX

Counter Dividers Overview

The onsemi 74AC191SCX is a synchronous reversible modulo 16 binary counter housed in a 16-lead SOIC package. It features asynchronous parallel preset capability and operates within a supply voltage range of 2.0V to 6.0V. The device supports a typical maximum count frequency of 133 MHz at 5.0V, with propagation delays ranging from 1.5ns to 12.5ns depending on the specific signal path and load conditions. It provides outputs capable of sourcing or sinking 24 mA and includes Terminal Count (TC) and Ripple Clock (RC) outputs for cascading applications.

Counter Dividers Feature Summary

• Synchronous up/down counting controlled by U/D input
• Asynchronous parallel load for immediate data presetting
• Ripple clock output simplifies multi-stage counter design

Counter Dividers Applications

• Programmable frequency dividers
• Multi-stage binary counters
• Timing control circuits

Counter Dividers Procurement Notes

Verify the component origin, as datasheets indicate Fairchild Semiconductor history now managed by onsemi. Confirm the SCX suffix denotes tape and reel packaging. Ensure the specific lot matches current manufacturing standards. Check for RoHS compliance documentation. Validate that the SOIC-16 package dimensions align with PCB footprint requirements.

Counter Dividers Selection Notes

Select this component when synchronous operation with asynchronous preset is required. The AC series offers higher speed than standard 74LS counterparts. Consider the 24 mA drive capability for direct load interfacing. Evaluate the ripple clock feature if cascading multiple stages without complex gating logic. Verify voltage compatibility with the system's 2V to 6V operating range.

Counter Dividers Part Context

This part belongs to the 74AC logic family, known for high-speed CMOS performance. It is functionally similar to the 74HC191 but optimized for faster switching speeds. The SCX variant specifically indicates surface mount packaging in a tape and reel format, suitable for automated assembly processes.

Counter Dividers Replacement Considerations

Check for 74HC191 equivalents if lower speed is acceptable. Verify pinout compatibility with 74LS191 variants, noting voltage level differences. Ensure substitute parts support the same 16-lead SOIC package and asynchronous preset functionality.