54LS193DM

Overview

The 54LS193DM is a synchronous up/down binary counter manufactured by National Semiconductor. It features independent clock inputs for up-counting and down-counting operations, along with asynchronous parallel data loading capabilities. The device operates within a count rate of 25 MHz and supports positive edge triggering. It is housed in a 16-SOIC surface-mount package and is designed for military-grade performance with an operational temperature range extending from -55°C to 125°C.

Feature Summary

• Synchronous up/down counting functionality with independent clock inputs
• Asynchronous parallel data loading for immediate value setting
• Military-grade reliability with extended temperature tolerance

Applications

• Binary counting applications requiring precise direction control
• Digital timing systems utilizing parallel load capabilities
• Military electronic equipment operating in extreme environments

Procurement Notes

Verify the component origin as National Semiconductor or its successor Texas Instruments. Confirm the specific suffix DM indicates the 16-SOIC surface-mount package. Ensure the unit meets MIL-STD-883 Class C screening requirements if specified for your application. Check for RoHS compliance status as older military parts may not be compliant.

Selection Notes

Select this component when a synchronous binary counter with separate up and down clocks is required. The 54LS series offers lower power consumption compared to standard TTL while maintaining compatible logic levels. The SOIC package is suitable for automated surface-mount assembly processes. Consider the 25 MHz maximum frequency limit for high-speed digital designs.

Part Context

This part belongs to the 54LS family of logic integrated circuits, which are designed for military specifications. The 54LS193 specifically addresses the need for bidirectional counting in complex digital systems. Its parallel load feature allows for flexible initialization without waiting for clock cycles, enhancing system responsiveness in critical applications.

Replacement Considerations

Direct replacements include other 54LS193 variants from National Semiconductor or Texas Instruments. Verify pin compatibility and electrical characteristics before substituting. Commercial equivalents like the 74LS193 may differ in temperature range and reliability standards.