74AC191SJ

Counter Dividers Overview

The Fairchild Semiconductor 74AC191SJ is a synchronous, bidirectional 4-bit binary counter belonging to the AC series. It operates on a positive edge-triggered clock and supports up/down counting via a single control input. The device features asynchronous parallel load capability for presetting output states. It is housed in a 16-lead Small Outline Package (SOP) with EIAJ TYPE2 dimensions. The component is RoHS compliant and lead-free.

Counter Dividers Feature Summary

• Synchronous operation eliminates output counting spikes associated with ripple counters
• Bidirectional counting capability controlled by a single direction pin
• Asynchronous parallel load allows immediate presetting of output data

Counter Dividers Applications

• Digital frequency division circuits
• Time-base generation systems
• Position control logic

Counter Dividers Procurement Notes

Verify the specific suffix SJ corresponds to the SOP-16 package variant when sourcing. Confirm RoHS compliance status matches current manufacturing standards. Ensure voltage supply ranges align with system requirements before integration. Check for obsolescence notices as this component may be discontinued.

Counter Dividers Selection Notes

Select this part for applications requiring high-speed synchronous counting with minimal propagation delay. Compare against LS or HC series alternatives if lower power consumption or different speed grades are required. Verify package compatibility with existing PCB footprints. Consider temperature range specifications for industrial environments.

Counter Dividers Part Context

This component is part of the 74AC logic family, offering higher speed performance compared to standard TTL counterparts. It serves as a direct functional replacement for older 74LS191 designs in modern CMOS-based systems. The AC series provides improved switching speeds while maintaining compatible logic levels.