MC74HC4020AD

Counter Dividers Overview

The MC74HC4020AD is a 14-stage binary ripple counter manufactured by onsemi in the HC logic series. It operates within a supply voltage range of 2.0 V to 6.0 V and supports a maximum clock frequency of 50 MHz at 6.0 V. The device features asynchronous active-high reset, negative-edge triggering, and outputs Q1 through Q14 available on a 16-lead SOIC package. Propagation delays from clock to Q1 range from 25 ns to 96 ns depending on voltage.

Counter Dividers Feature Summary

• Contains 14 master-slave flip-flops with 12 stages brought out to pins for binary counting
• Outputs directly interface to CMOS, NMOS, and TTL loads
• Asynchronous active-high reset forces all outputs low
• High noise immunity characteristic of CMOS devices

Counter Dividers Applications

• Time-base generators
• Frequency division circuits
• Digital counting systems

Counter Dividers Procurement Notes

Verify the specific suffix 'D' corresponds to the SOIC-16 package (Case 751B) as listed in the ordering information. Confirm RoHS compliance status if required, noting that 'G' suffix indicates Pb-Free packages while standard versions may differ. Ensure the source document explicitly lists the exact part number variant being procured to avoid pinout or electrical specification mismatches.

Counter Dividers Selection Notes

Select this component when a 14-bit binary counter is required with direct CMOS/TTL interfacing capabilities. Consider the ripple counter architecture where decoded output signals may be subject to decoding spikes due to internal ripple delays. Verify that the application can tolerate the propagation delay variations across the operating temperature range of -55°C to +125°C.

Counter Dividers Part Context

This device belongs to the MC74HC4020A family of high-performance silicon-gate CMOS counters. It is identical in pinout to the standard CMOS MC14020B but offers improved speed and lower power consumption typical of the HC series. The family includes various package options including PDIP, TSSOP, and SOEIAJ-16.

Counter Dividers Replacement Considerations

MC74HC4020ADR2G

Counter Dividers FAQ

How does the reset function operate?

The reset is asynchronous and active-high. Applying a high level to the Reset pin asynchronously resets the counter to its zero state, forcing all Q outputs low.

What causes decoding spikes in the outputs?

State changes of the Q outputs do not occur simultaneously because of internal ripple delays. Therefore, decoded output signals are subject to decoding spikes.