MM74HC191N

Counter Dividers Overview

The MM74HC191N is a synchronous, bidirectional 4-bit binary counter manufactured by Fairchild Semiconductor (National Semiconductor). It operates on a single supply voltage ranging from 2 V to 6 V. The device features asynchronous reset and positive-edge triggering for both count-up and count-down operations. It is housed in a 16-pin Plastic Dual In-Line Package (PDIP) with an operating temperature range of -40°C to 85°C.

Counter Dividers Feature Summary

• Synchronous bidirectional counting capability allowing up or down sequences controlled by a direction input.
• Asynchronous master reset function that clears all outputs independently of the clock signal.
• Positive-edge triggered operation synchronized with the clock input for precise timing control.

Counter Dividers Applications

• Digital frequency division circuits
• Position control systems requiring bidirectional tracking
• Timing sequence generation in digital logic designs

Counter Dividers Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific MM prefix aligns with Fairchild Semiconductor production standards if sourcing legacy inventory. Confirm package integrity and pin compatibility during inspection to avoid installation errors in existing PCB layouts.

Counter Dividers Selection Notes

Select this component when a synchronous, bidirectional 4-bit counter is required within a low-voltage CMOS environment. It is suitable for applications needing simple up/down counting without complex decoding logic. Consider the PDIP package constraints for through-hole mounting requirements versus surface mount alternatives.

Counter Dividers Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It provides standard binary counting functions compatible with various digital systems. The MM prefix typically indicates a specific packaging or material variant produced under the Fairchild brand lineage before corporate integration.

Counter Dividers Replacement Considerations

SN74HC191NS: Texas Instruments equivalent in SOIC package. SN74HC193N: Synchronous 4-bit up/down counter with different reset configuration. CD40193BM96: Alternative bidirectional counter with different voltage ranges.