SNJ54BCT373J

Overview

The SNJ54BCT373J is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It utilizes a state-of-the-art BiCMOS design to significantly reduce quiescent current (ICCZ). The device operates within a supply voltage range of 4.5 V to 5.5 V and features full parallel access for loading applications. It includes buffered output-enable (OE) inputs to place outputs in high-impedance states, suitable for driving bus lines or buffering memory address registers without interface components.

Feature Summary

• State-of-the-art BiCMOS design reduces ICCZ
• Full parallel access for loading
• 3-state outputs drive bus lines or buffer memory address registers
• ESD protection exceeds JESD 22

Applications

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

Procurement Notes

Verify the ordering suffix 'J' corresponds to the CDIP package and -55°C to 125°C temperature rating. Confirm RoHS status as 'No' per the Package Option Addendum. Ensure OE is tied to VCC through a pullup resistor during power up or power down to maintain the high-impedance state. Check MIL-PRF-38535 compliance if military specifications are required.

Selection Notes

Select this component for applications requiring octal latching with 3-state outputs in harsh environments due to its extended temperature range. The BiCMOS technology offers lower power consumption compared to standard CMOS. Verify that the 20-pin CDIP package fits the PCB layout constraints. Consider the ESD protection levels when designing for sensitive interfaces.

Part Context

This part belongs to the SN54/74BCT373 family of octal transparent D-type latches. The SN54 series denotes military-grade performance with a wider operating temperature range (-55°C to 125°C) compared to the commercial SN74 series. The 'BCT' indicates BiCMOS Technology, and '373' identifies the specific latch function with 3-state outputs.

Replacement Considerations

SNJ54BCT373FK (LCCC package), SNJ54BCT373W (CFP package)

FAQ

How does the Output Enable (OE) input affect internal latch operations?

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

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

OE should be tied to VCC through a pullup resistor. The minimum value of the resistor is determined by the current-sinking capability of the driver.