SNJ54ABT373J

Overview

The SNJ54ABT373J 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 source and 64-mA sink currents. The device operates over the full military temperature range of -55°C to 125°C and supports a supply voltage (VCC) from 4.5 V to 5.5 V. It features buffered output-enable inputs to place outputs in a high-impedance state, ensuring glitch-free bus loading during power-up and power-down cycles.

Feature Summary

• Transparent D-type latching mechanism where outputs follow data inputs when latch-enable is high
• Buffered output-enable input controls normal logic states or high-impedance bus isolation
• High-drive output capability supporting direct bus interfacing without interface components
• Glitch-free high impedance state maintained throughout entire power-up and power-down sequences

Applications

• Bus organized system applications requiring octal data storage
• Military and defense electronic systems operating in extreme environments
• High-performance digital logic circuits utilizing 3-state bus architectures

Procurement Notes

Verify that the specific ordering suffix 'J' corresponds to the Ceramic Dual-In-Line package variant intended for your application. Confirm that the component meets the required military specifications and environmental standards for your deployment. Ensure compatibility with the specified 4.5 V to 5.5 V supply voltage range and verify pinout alignment with your schematic design before finalizing procurement.

Selection Notes

Select this component when operation within the full military temperature range of -55°C to 125°C is mandatory. Choose this part for designs requiring high-drive current capabilities to drive bus lines directly. Consider this device for applications needing significant power reduction through BiCMOS technology while maintaining fast switching speeds and robust latch-up protection exceeding standard JEDEC limits.

Part Context

This component belongs to the SN54ABT373 family of octal transparent D-type latches. The SN54 series designation indicates qualification for military specifications and extended temperature ranges compared to the commercial SN74 variants. The ABT series represents Advanced BiCMOS Technology, offering a balance of speed and low power consumption suitable for demanding digital logic applications.

Replacement Considerations

SNJ54ABT373FK

FAQ

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

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

What is the purpose of tying the output-enable input to VCC through a pullup resistor?

Tying the output-enable input to VCC through a pullup resistor ensures the high-impedance state during power up or power down, preventing the outputs from driving the bus lines significantly during these transitions.