MC74HC161ADR2

Counter Dividers Overview

The MC74HC161ADR2 is a high-performance silicon-gate CMOS presettable binary counter manufactured by onsemi. It features a 4-bit synchronous count architecture with an asynchronous reset function, distinguishing it from the HC163A variant which utilizes synchronous reset. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports a maximum clock frequency of 35 MHz at 6.0 V. It is housed in a 16-pin SOIC package and includes parallel load capabilities, dual count enable controls (Enable P and Enable T), and a ripple carry output for cascading applications.

Counter Dividers Feature Summary

• Asynchronous reset functionality that immediately clears outputs regardless of clock state
• Synchronous 4-bit binary counting with programmable parallel data loading
• Dual count enable inputs allowing flexible control over counting operations
• Ripple carry output generation for efficient multi-stage counter expansion

Counter Dividers Applications

• N-bit synchronous counter construction via cascading
• Modulo-N counter design using external logic feedback
• Digital timing and sequencing circuits requiring precise clock edge triggering
• Frequency division and pulse counting systems

Counter Dividers Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm the specific ordering suffix matches the required package type and lead-free status. Check current product lifecycle status as availability may vary. Ensure environmental compliance documentation aligns with project requirements before finalizing procurement decisions.

Counter Dividers Selection Notes

Select this component when an asynchronous reset mechanism is required for immediate output clearing. Compare against the MC74HC163A if synchronous reset behavior is preferred for glitch-free operation. Consider the operating voltage range and maximum clock frequency limits relative to system performance needs. Evaluate package constraints to ensure compatibility with PCB layout specifications.

Counter Dividers Part Context

This part belongs to the MC74HC16xA series of high-speed CMOS logic counters. It shares pinout compatibility with legacy LS161 devices while offering improved noise immunity and lower input current characteristics typical of modern CMOS technology. The series supports standard CMOS and LSTTL interfacing with appropriate pull-up resistors.

Counter Dividers Replacement Considerations

MC74HC161ADG serves as a lead-free alternative within the same package family. For synchronous reset functionality, consider the MC74HC163ADR2G variant. Verify pinout compatibility and electrical characteristics when substituting with equivalent parts from other manufacturers.