40161BDM

Overview

The CD40161BDM is a CMOS synchronous programmable 4-bit binary counter manufactured by National Semiconductor. It features an asynchronous clear input that sets all outputs low regardless of the clock state, and a synchronous load control input for parallel data entry. The device includes internal look-ahead circuitry to accelerate carry propagation and provides a ripple carry output suitable for cascading multiple counters. It operates with low power TTL compatibility and standardized symmetrical output characteristics.

Feature Summary

• Synchronous four-bit binary counting with internal look-ahead for high-speed operation
• Asynchronous clear function independent of clock signal timing
• Synchronous parallel load capability for direct data presetting
• Ripple carry output designed for multi-stage counter expansion

Applications

• Digital frequency division circuits
• Sequential event timing logic
• Cascaded digital counting systems

Procurement Notes

Verify the manufacturer designation as National Semiconductor or its successor entities like Texas Instruments, as corporate acquisitions may affect part sourcing. Confirm the specific suffix 'DM' corresponds to the correct plastic DIP package variant required for your board layout. Ensure the component meets the necessary voltage ratings and temperature specifications for your intended operational environment before finalizing procurement.

Selection Notes

Select this component when a synchronous binary counter with asynchronous reset is required. It is suitable for applications needing parallel loading capabilities and fast carry propagation through internal look-ahead logic. Consider the package type and operating voltage range to ensure compatibility with the system's power supply and PCB footprint constraints.

Part Context

This component belongs to the CD4000 series of CMOS logic devices, widely used in general-purpose digital electronics. It serves as a fundamental building block for sequential logic designs, offering reliable performance in various consumer and industrial applications requiring precise binary counting and data storage functions.