SNJ54ABT573J

Overview

The SNJ54ABT573J 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 temperature range of -55°C to 125°C. The device features high-drive outputs capable of sourcing -32 mA and sinking 64 mA, ensuring effective driving of capacitive or low-impedance loads. Propagation delays from data inputs (D) to outputs (Q) typically range from 3.2 ns to 5.7 ns at 5 V. The component includes Ioff circuitry for partial-power-down support and meets JEDEC standards for latch-up performance exceeding 500 mA.

Feature Summary

• Features buffered output-enable inputs that allow placement of outputs in normal logic states or high-impedance state without affecting internal latch operations.
• Includes dedicated Ioff circuitry that disables outputs to prevent damaging current backflow during power-down conditions.
• Provides high-drive output capability designed specifically for driving highly capacitive or relatively low-impedance loads.

Applications

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

Procurement Notes

Verify the specific ordering suffix J corresponds to the CDIP package when sourcing this component. Confirm that the procurement channel accepts parts with non-RoHS compliance status if required by project specifications. Ensure the supplier provides documentation confirming the military-grade temperature range capabilities. Validate that the received units match the active production status indicated in the manufacturer's latest package addendum.

Selection Notes

Select this component for applications requiring robust drive strength and wide temperature tolerance in a through-hole format. The ABT series offers faster switching speeds compared to standard TTL equivalents while maintaining compatible voltage levels. Consider the 20-pin CDIP footprint constraints during PCB layout planning. Evaluate the need for pullup resistors on the OE pin to ensure high-impedance states during power cycles.

Part Context

This part belongs to the SN54ABT573 family of octal transparent D-type latches with 3-state outputs. The 'SNJ' prefix denotes a military-grade device housed in a ceramic dual in-line package (CDIP). It shares functional similarities with the commercial SN74ABT573A variant but differs in operating temperature range and packaging material. The family is designed for high-performance digital systems requiring reliable data storage and bus interfacing.

Replacement Considerations

• SNJ54ABT573W
• SNJ54ABT573FK

FAQ

How does the Ioff circuitry function during power-down?

The Ioff circuitry automatically disables the outputs when the device is powered down, preventing damaging current backflow through the device into the power supply lines.

What is the recommended configuration for the OE pin during power-up?

To ensure the high-impedance state during power up or power down, the OE input should be tied to VCC through a pullup resistor, with the minimum value determined by the driver's current-sinking capability.