74AC191SC

Counter Dividers Overview

The onsemi 74AC191SC is a synchronous reversible modulo 16 binary counter housed in a 16-lead Small Outline Integrated Circuit (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. It provides outputs capable of sourcing or sinking 24 mA, ensuring robust drive capabilities for digital logic applications.

Counter Dividers Feature Summary

• Synchronous up/down counting with asynchronous parallel load functionality
• Integrated Terminal Count (TC) output for overflow/underflow indication
• Ripple Clock (RC) output simplifies multi-stage counter design
• Cascadable architecture supporting various counting configurations

Counter Dividers Applications

• Programmable frequency dividers
• Multi-stage synchronous counters
• Binary counting sequences
• Digital timing circuits

Counter Dividers Procurement Notes

Verify the specific package variant, as the SC suffix denotes the SOIC package. Confirm that the component meets required operating temperature ranges and electrical specifications for the target application. Ensure compatibility with existing logic levels and power supply constraints before integration into the final design.

Counter Dividers Selection Notes

Select this component when a high-speed, synchronous 4-bit reversible counter is required. Consider the asynchronous preset feature for programmable division ratios. Evaluate the ripple clock output utility for cascading stages versus synchronous carry methods based on timing skew requirements in the system design.

Counter Dividers Part Context

This part belongs to the AC logic family, characterized by reduced current consumption and high-speed operation compared to older standards. The 74AC191 series is designed for general-purpose digital counting applications requiring precise synchronization and flexible configuration options through its control inputs.

Counter Dividers Replacement Considerations

Check for equivalent parts from other manufacturers offering the same AC logic family specifications. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive current to ensure seamless substitution without circuit redesign.