54F192DMQB

Overview

The 54F192DMQB is a high-speed FET TTL up/down decade counter manufactured by National Semiconductor. It features separate clock inputs for counting up and down operations, allowing independent control of the count direction. The device operates on a single 5 V supply and supports asynchronous loading of parallel data via dedicated preset inputs. It provides complementary outputs for each bit position and includes ripple carry outputs to facilitate cascading multiple counters for extended word lengths.

Feature Summary

• Features separate clock inputs for independent up and down counting operations
• Supports asynchronous parallel data loading through dedicated preset terminals
• Provides complementary output signals for all four bit positions
• Includes ripple carry outputs to enable multi-stage counter expansion

Applications

• Digital frequency division circuits requiring bidirectional counting
• Cascaded decade counter systems for digital displays
• Programmable timing generators with adjustable count ranges
• Control logic for reversible digital measurement instruments

Procurement Notes

Verify component authenticity against National Semiconductor datasheets. Confirm ceramic flatpack package integrity and pin alignment. Check for military-grade screening documentation if required. Ensure voltage ratings match system specifications before integration.

Selection Notes

Select this component when bidirectional decade counting with separate clocks is required. Suitable for applications needing asynchronous preset capability. Verify compatibility with FET TTL logic levels. Consider thermal management for high-frequency operation within specified temperature ranges.

Part Context

Part of the 54F series high-speed FET TTL family. Designed for demanding digital logic applications requiring fast switching speeds. Manufactured using advanced semiconductor processes for reliability in harsh environments.

Replacement Considerations

• 54F192DM
• 74F192

FAQ

How are count direction changes managed?

Direction is controlled by applying clock signals to either the up-clock or down-clock input terminal independently.

Is the preset function synchronous or asynchronous?

The parallel load feature operates asynchronously, updating outputs immediately upon activation regardless of clock state.