SNJ54ABT373FK

Overview

The SNJ54ABT373FK is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It utilizes state-of-the-art EPIC-IIB BiCMOS design to significantly reduce power dissipation while providing high-drive outputs capable of -32-mA IOH and 64-mA IOL. The device operates within a supply voltage range of 4.5 V to 5.5 V and is characterized for the full military temperature range of –55°C to 125°C. It features latch-up performance exceeding 500 mA per JEDEC standard JESD-17 and typical VOLP (output ground bounce) less than 1 V at VCC = 5 V.

Feature Summary

• Transparent D-type latching behavior where outputs follow data inputs when latch-enable is high
• High-drive 3-state outputs eliminate need for interface or pullup components on bus lines
• EPIC-IIB BiCMOS technology ensures low power dissipation and robust latch-up protection

Applications

• Bus-oriented system applications requiring data storage and buffering
• Military and defense electronic systems operating in extreme temperatures
• High-speed digital logic circuits utilizing 5-V supply rails

Procurement Notes

Verify the specific ordering suffix FK corresponds to the Leadless Ceramic Chip Carrier package configuration. Confirm that the SN prefix indicates QML certification suitable for military and defense applications. Ensure compatibility with the required 4.5-V to 5.5-V supply voltage range and verify that the component meets the specified –55°C to 125°C operating temperature requirements for the intended environment.

Selection Notes

Select this component when high drive capability and low power consumption are critical for bus interfacing. The SN54 series designation confirms suitability for environments requiring operation from –55°C to 125°C, unlike the SN74 series limited to –40°C to 85°C. The FK package option provides a ceramic leadless chip carrier form factor suitable for surface-mount assembly in ruggedized designs.

Part Context

This part belongs to the SN54ABT373 family of octal transparent D-type latches. The SN54 prefix denotes military-grade qualification under MIL-PRF-38535 standards. The ABT series represents Advanced BiCMOS Technology offering superior speed and power characteristics compared to older logic families. The device functions as a buffer/latch combination for managing data flow in complex digital architectures.

Replacement Considerations

SNJ54ABT373J (Ceramic Dual-In-Line Package)

FAQ

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

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

What is the recommended method to ensure high-impedance during power up/down?

To ensure the high-impedance state during power up or power down, the output-enable pin should be tied to VCC through a pullup resistor.