4520BDM

Overview

The National Semiconductor 4520BDM is a 4-bit binary counter integrated circuit belonging to the 4000B series. It is housed in a 16-CDIP package with a width of 0.300 inches (7.62mm). The device functions as a synchronous counter capable of counting from 0 to 15, providing parallel outputs for digital logic applications.

Feature Summary

• Synchronous 4-bit binary counting capability
• Parallel output configuration for direct data reading
• Compatible with standard CMOS logic families

Applications

• Digital frequency division circuits
• Event counting systems
• Timing sequence generation

Procurement Notes

Verify the manufacturer designation and package type against official datasheets. Confirm the specific suffix indicates the correct pinout and electrical characteristics. Ensure the component matches the required logic family specifications before integration into designs.

Selection Notes

Select this component when a synchronous 4-bit binary counter is required within a CMOS logic design. Consider the 16-CDIP package constraints for through-hole mounting. Evaluate compatibility with existing power supply voltages and signal levels defined by the 4000B series standards.

Part Context

This part is part of the extensive 4000B series of CMOS logic devices produced by National Semiconductor, now part of Texas Instruments. The series includes various combinational and sequential logic functions designed for low-power consumption and wide voltage operation ranges common in industrial and consumer electronics.

Replacement Considerations

Check for equivalent parts such as CD4520 or HEF4520 which share similar logical functionality. Verify pin compatibility and electrical parameters before substitution to ensure system integrity.