SNJ54HCT373W

Overview

The SNJ54HCT373W is an octal transparent D-type latch with 3-state outputs, housed in a 20-pin Ceramic Flat Package (CFP). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to 125°C. The device features high-current outputs capable of driving up to 15 LSTTL loads, with typical propagation delays of 21 ns at 5 V. Input currents are low at 1 μA max, ensuring TTL-voltage compatibility.

Feature Summary

• Transparent D-type latching mechanism where outputs follow inputs during the enable phase
• Three-state output capability for bus-driven applications without interface components
• High-current drive strength suitable for capacitive or low-impedance loads
• TTL-compatible input logic levels with low power consumption

Applications

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

Procurement Notes

Verify the specific ordering suffix 'W' corresponds to the CFP package when sourcing. Confirm military or space qualification requirements if applicable, as this part number falls under the SN54 series which often denotes extended temperature or ruggedized variants. Check the latest package addendum for current production status and availability details directly from Texas Instruments documentation.

Selection Notes

Select this component for designs requiring octal data storage with tri-state control in harsh environments. The HCT technology ensures compatibility with standard TTL logic families while offering CMOS power efficiency. Ensure the application utilizes the full -55°C to 125°C temperature range capabilities provided by the ceramic packaging option.

Part Context

This device belongs to the SN54HCT373 family of octal transparent D-type latches. The SN54 prefix typically indicates military-grade specifications compared to the commercial SN74 series. The 'W' suffix specifically identifies the 20-pin Ceramic Flat Package variant, distinct from plastic packages like SOIC or PDIP found in other parts of the same logical family.

Replacement Considerations

SN54HCT373J (CDIP package)

FAQ

How does the Output Enable (OE) pin affect internal latch operation?

The OE pin controls the state of the outputs but does not affect the internal operations of the latches. Data can be retained or entered while the outputs are disabled.

What is the behavior of the Q outputs when the Latch Enable (LE) input is low?

When LE is taken low, the Q outputs are latched at the logic levels that were present at the D inputs at that moment.