SNJ54S373FK

Overview

The SNJ54S373FK is an octal D-type transparent latch manufactured by Texas Instruments. It features eight latches with three-state outputs designed for driving highly capacitive or low-impedance loads. The device operates within a temperature range of -55°C to 125°C and utilizes a 20-pin LCCC package.

Feature Summary

• Transparent data storage where outputs follow inputs while the enable signal is active
• Three-state bus-driving outputs capable of direct connection to system buses
• Buffered control inputs with hysteresis on the clock-enable line to improve noise rejection

Applications

• Implementing buffer registers in digital systems
• Configuring I/O ports for data interface
• Functioning as bidirectional bus drivers
• Serving as working registers in memory architectures

Procurement Notes

Verify that the specific ordering suffix FK corresponds to the ceramic LCCC package variant. Confirm compliance requirements, as this military-grade component may not adhere to standard commercial RoHS directives. Ensure the supply voltage matches the recommended operating conditions for the S series before integration.

Selection Notes

Select this component when high-speed data latching with bus isolation is required. The S series offers faster switching characteristics compared to LS variants. Verify that the system environment supports the wide operating temperature range and that the 20-pin LCCC footprint fits the PCB layout constraints.

Part Context

This part belongs to the SN54/74S373 family of octal D-type transparent latches. It shares functional similarities with the SN54LS373 but provides superior speed performance characteristic of the Schottky logic family. The 'SNJ' prefix indicates a military-grade qualification level from Texas Instruments.

Replacement Considerations

SNJ54LS373FK

FAQ

How does the clock-enable input handle noise?

The clock-enable input includes hysteresis, which improves AC and DC noise rejection by typically 400 mV.

What happens to the internal data when outputs are disabled?

The output-control (OC) input places outputs in a high-impedance state without affecting internal operation; old data is retained or new data can be entered while outputs are off.