M74HC393B1R

Counter Dividers Overview

The M74HC393B1R is a high-speed CMOS dual binary counter fabricated with silicon gate C2MOS technology. It contains two independent 4-bit ripple carry counters that can be cascaded to form a single divide-by-256 counter. Each counter increments on the negative edge of its clock input and features an asynchronous master reset (clear) input. The device operates within a supply voltage range of 2V to 6V, supports a maximum clock frequency of 79 MHz at 6V, and includes input protection against static discharge.

Counter Dividers Feature Summary

• Dual independent 4-bit ripple carry binary counters
• Asynchronous master reset for individual counter clearing
• Negative edge-triggered clock inputs
• Input protection circuits against static discharge

Counter Dividers Applications

• Digital counting systems
• Frequency division circuits
• Timing sequence generation
• Cascaded multi-stage counter configurations

Counter Dividers Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package type matches design requirements, as the B1R suffix indicates DIP packaging. Check current lifecycle status, as availability may vary by region. Ensure compliance with RoHS directives if required by project specifications.

Counter Dividers Selection Notes

Select this component when dual independent binary counting is required in a single package. Verify operating voltage compatibility with the 2V to 6V range. Consider propagation delay characteristics for timing-critical applications. Ensure thermal management meets power dissipation limits under expected load conditions.

Counter Dividers Part Context

This part belongs to the M74HC series of high-speed CMOS logic devices from STMicroelectronics. It is functionally compatible with the standard 74HC393 pinout and logic operations. The series utilizes silicon gate C2MOS technology for low power consumption and high noise immunity.

Counter Dividers Replacement Considerations

CD74HC393E from Texas Instruments is a documented similar alternative.