CD54HC191F3A

Counter Dividers Overview

The CD54HC191F3A is a high-speed CMOS logic asynchronous presettable binary counter housed in a 16-lead ceramic dual in-line package (CDIP). It operates on a supply voltage range of 2 V to 6 V and supports an extended temperature range from -55°C to 125°C. The device features synchronous counting triggered by the low-to-high clock transition, alongside asynchronous parallel loading via the LOAD input. It includes dedicated outputs for n-bit cascading and look-ahead carry capabilities.

Counter Dividers Feature Summary

• Synchronous up/down counting controlled by direction and enable inputs
• Asynchronous parallel load capability for immediate data presetting
• Look-ahead carry output for high-speed multi-stage cascading

Counter Dividers Applications

• High-speed binary counting applications requiring wide voltage operation
• Military and aerospace systems utilizing ceramic DIP packaging
• Multi-stage counter designs using look-ahead carry or ripple clock methods

Counter Dividers Procurement Notes

Verify that the specific part number matches the HC series rather than HCT, as electrical characteristics differ significantly. Confirm the F3A suffix corresponds to the specified ceramic CDIP package and military-grade temperature rating. Ensure compatibility with existing board layouts designed for standard 16-pin DIP footprints.

Counter Dividers Selection Notes

Select this component when a wide 2 V to 6 V operating range is required, distinguishing it from the HCT variant limited to 4.5 V to 5.5 V. The ceramic CDIP package provides necessary environmental robustness for extreme temperatures. Consider the HC family's lower power dissipation compared to TTL equivalents for battery-operated or low-power systems.

Counter Dividers Part Context

This component belongs to the Texas Instruments CD54/74HC19x series of high-speed CMOS logic devices. The HC designation indicates standard CMOS performance, while the 54 prefix typically denotes military-grade specifications. It is functionally related to the CD54HC190, which is a BCD decade counter, whereas this model handles full 4-bit binary sequences.

Counter Dividers Replacement Considerations

• CD54HC190F3A
• CD54HCT191F3A

Counter Dividers FAQ

How does the asynchronous load feature operate?

Presetting the counter to the number on the preset data inputs is accomplished by driving the LOAD input low, independent of the clock signal.

What is the purpose of the MAX/MIN output?

The MAX/MIN output goes high during overflow or underflow events and remains high for one clock cycle, facilitating look-ahead carry in high-speed cascading configurations.