4020BDC

Overview

The National Semiconductor CD4020BDC is a 14-stage binary ripple counter and frequency divider. It features an asynchronous master reset input and twelve buffered parallel outputs (Q0, Q3 through Q13). The device advances on the high-to-low transition of the clock pulse. It operates within a wide supply voltage range and includes clamp diodes on inputs to allow current limiting resistors for interfacing with voltages exceeding VCC.

Feature Summary

• 14-stage binary ripple counter architecture
• Asynchronous master reset capability
• Twelve buffered parallel outputs
• Input clamp diodes for over-voltage protection

Applications

• Frequency dividing circuits
• Time delay circuits
• Control counters

Procurement Notes

Verify the manufacturer origin as National Semiconductor or its successor Texas Instruments. Confirm the package type matches the DC suffix specification. Ensure compliance with required operating temperature ranges and voltage specifications for the target application environment before procurement.

Selection Notes

Select this component when a 14-stage binary count is required without integrated oscillator functionality. Compare against CD4060 if an internal oscillator is needed. Verify that the CMOS logic levels and power dissipation characteristics align with the system design constraints.

Part Context

This part belongs to the CD4000 series of CMOS digital logic devices. It serves as a fundamental building block for sequential logic applications requiring binary counting or frequency division. The device is compatible with standard CMOS logic families and offers high noise immunity.