SNJ54HC191FK

Counter Dividers Overview

The SNJ54HC191FK is a military-grade, 4-bit synchronous reversible binary counter from the Texas Instruments HC logic family. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -55°C to 125°C. The device features fully synchronous counting triggered by low-to-high clock transitions, asynchronous preset capability via the LOAD input, and look-ahead circuitry for cascaded high-speed operation. It utilizes a 20-pin LCCC (FK) package.

Counter Dividers Feature Summary

• Synchronous up/down counting with simultaneous flip-flop triggering to eliminate output spikes
• Asynchronously programmable preset function allowing independent data loading without clock dependency
• Look-ahead circuitry utilizing MAX/MIN outputs to enhance speed in cascaded configurations

Counter Dividers Applications

• Military and defense applications requiring extended temperature stability
• High-speed digital systems utilizing look-ahead cascading techniques
• Modulo-N divider circuits implemented through asynchronous preset modification

Counter Dividers Procurement Notes

Verify that the specific ordering suffix FK corresponds to the Leadless Ceramic Chip Carrier package configuration. Confirm that the procurement channel sources QML-certified or military-qualified units consistent with the SN54 prefix designation. Ensure environmental specifications align with the required -55°C to 125°C operational range for the intended application environment.

Counter Dividers Selection Notes

Select this component when military-grade reliability and wide temperature tolerance are mandatory requirements. The HC series offers low power consumption suitable for battery-operated or heat-sensitive environments. Consider the LCCC package constraints regarding PCB mounting and thermal management during the design phase.

Counter Dividers Part Context

This part belongs to the SN54HC191 family of 4-bit synchronous reversible counters. The SN54 prefix indicates qualification for military standards, distinguishing it from the commercial SN74HC191 variant. The FK suffix specifically identifies the 20-pin leadless ceramic chip carrier package format used in ruggedized electronic assemblies.

Counter Dividers Replacement Considerations

SNJ54HC191J

Counter Dividers FAQ

How does the SNJ54HC191FK handle count direction changes?

Count direction is determined by the level of the D/U input; a low level enables counting up, while a high level enables counting down. Changes take effect on the next clock transition.

What is the function of the MAX/MIN output?

The MAX/MIN output produces a high-level pulse approximately equal to one clock cycle duration when the counter reaches zero during down-counting or maximum count during up-counting.