SNJ54F373FK

Overview

The SNJ54F373FK 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 eight latches in a single package, providing full parallel access for loading and buffered control inputs. It utilizes a 20-pin Leadless Ceramic Chip Carrier (LCCC) package.

Feature Summary

• Transparent D-type latching mechanism allows Q outputs to follow D inputs while latch-enable is high
• Three-state outputs designed for driving highly capacitive or low-impedance loads without interface components
• Buffered output-enable input isolates outputs into high-impedance state without affecting internal latch operations

Applications

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

Procurement Notes

Verify the specific military qualification status associated with the SNJ prefix and FK suffix against current Texas Instruments product life cycle data. Confirm RoHS compliance requirements as indicated in the packaging addendum. Ensure the procurement source provides valid traceability documentation for defense applications.

Selection Notes

Select this component when military-grade temperature stability (-55°C to 125°C) is required alongside high-drive capability for bus systems. The LCCC package suits hermetic sealing needs. Compare propagation delays and output drive strengths against standard catalog variants if commercial temperature ranges are sufficient.

Part Context

This part belongs to the SN54F series of logic devices, characterized for full military temperature ranges. It is functionally similar to the SN74F373 but differs in temperature rating and packaging options. The 'FK' suffix specifically denotes the 20-pin Leadless Ceramic Chip Carrier package configuration.

Replacement Considerations

SNJ54F373J

FAQ

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

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

What is the purpose of the high-impedance state in this device?

The high-impedance state prevents the outputs from loading or driving bus lines significantly, allowing bus driving without interface or pullup components.