SNJ54F373J

Overview

The SNJ54F373J is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It 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. The device features buffered control inputs and is designed for driving highly capacitive or low-impedance loads. It utilizes a 20-pin Ceramic Dual In-Line Package (CDIP).

Feature Summary

• Transparent D-type latching behavior where outputs follow data inputs while the latch-enable signal is high.
• Three-state outputs capable of driving bus lines without requiring interface or pullup components.
• Buffered output-enable input allows isolation of outputs into a high-impedance state without affecting internal latch operations.

Applications

• Implementing buffer registers in digital systems.
• Designing I/O ports for microprocessor interfaces.
• Constructing bidirectional bus drivers.
• Utilizing as working registers for temporary data storage.

Procurement Notes

Verify that the component matches the SNJ54F373J designation, specifically confirming the military-grade temperature rating (-55°C to 125°C) and the 20-pin CDIP package configuration. Ensure compliance with QML certification requirements if applicable to the specific procurement contract, as this variant is designated for military and defense applications.

Selection Notes

Select the SNJ54F373J when full military temperature operation is required alongside octal latching functionality. This part is distinct from the commercial SN74F373 series due to its extended temperature range and ceramic packaging. Consider the 3-state output capability for bus-driven architectures where high-impedance isolation is necessary to prevent bus contention.

Part Context

The SNJ54F373J belongs to the SN54F373 family of octal transparent D-type latches. It shares functional similarities with other F-series logic devices but is distinguished by its military qualification and ceramic dual in-line package construction. The 'J' suffix denotes the specific 20-pin CDIP package option available within this product line.

Replacement Considerations

SNJ54F373FK

FAQ

How does the output-enable input affect the internal latch operation?

The output-enable input does not affect the internal operations of the latches. Data can be retained or entered while the outputs are in the high-impedance state.

What is the function of the latch-enable input?

While the latch-enable input is high, the Q outputs follow the D inputs. When taken low, the outputs are latched at the logic levels present at the D inputs.