SNJ54LS373FK

Overview

The SNJ54LS373FK is an octal D-type transparent latch manufactured by Texas Instruments. It features eight latches with three-state outputs designed for driving high-capacitance or low-impedance loads in bus-organized systems. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature range from -55°C to 125°C. It utilizes a 20-pin LCCC (FK) package.

Feature Summary

• Transparent D-type latching mechanism where outputs follow data inputs while the enable signal is active
• Three-state bus-driving outputs capable of direct connection to system buses without interface components
• Buffered output control input allows placement of outputs in normal logic states or high-impedance state

Applications

• Buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify that the component matches the specific military-grade SNJ prefix designation and FK ceramic package configuration. Confirm compliance with MIL-PRF-38535 requirements if applicable, as production processing may not include testing of all parameters unless explicitly stated for this qualification level.

Selection Notes

Select this component when a transparent latch function is required rather than edge-triggered storage. Ensure the design accommodates the LS series propagation delays and drive capabilities. Verify that the wide industrial temperature range meets environmental specifications for the intended application environment.

Part Context

This part belongs to the SN54LS373 family of octal D-type transparent latches. It shares functional characteristics with other variants in the SDLS165B datasheet but differs in packaging and temperature rating. The SNJ prefix indicates a military-grade version compared to commercial SN74 counterparts.

Replacement Considerations

SNJ54LS373J

FAQ

How does the output control input affect internal operation?

The buffered output control input places outputs in a high-impedance state without affecting the internal operation of the latches, allowing old data retention or new data entry while outputs are off.

What is the behavior of the latches during the enable phase?

The eight latches are transparent D-type latches, meaning the Q outputs follow the D inputs while the enable input is high. When the enable goes low, the output is latched at the set data level.