SN74AHCT373NSR

Overview

The SN74AHCT373NSR is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs. The device provides a propagation delay of 9.5ns at 5V VCC with a load capacitance of 15pF. It utilizes a SOP-20 package for surface-mount installation.

Feature Summary

• Features balanced CMOS 3-state outputs capable of driving high, low, or entering a high-impedance state via the OE input.
• Includes TTL-compatible CMOS inputs designed to interface directly with TTL logic devices using reduced input voltage thresholds.
• Contains eight D-type latches sharing common LE and OE control signals for synchronized data storage and bus buffering.

Applications

• Parallel data storage
• Digital bus buffer

Procurement Notes

Verify that the ordering suffix 'SR' corresponds to the specified SOP-20 surface-mount package configuration. Confirm compliance with RoHS standards and ensure the component meets the required operating temperature range specifications before integration into the final design.

Selection Notes

Select this component when TTL-level compatibility is required alongside high-speed performance in a 5V system. The SOP-20 package is suitable for applications needing space-efficient surface-mount solutions. Ensure the design accounts for the shared latch enable and output enable control lines across all channels.

Part Context

This part belongs to the SNx4AHCT373 family of octal transparent D-type latches. The AHCT series combines the speed of advanced CMOS technology with TTL-compatible input levels. The NS suffix indicates the specific SOP-20 physical package variant within the broader product line.

Replacement Considerations

SN74AHCT373PW

FAQ

How does the Output Enable (OE) pin affect the stored data?

The active-low OE pin controls the output state but does not impact the stored state within the latches. When OE is high, outputs enter a high-impedance state; when low, they actively drive.

What happens to the outputs if the Latch Enable (LE) is held low during startup?

If LE is held low during startup, the output state of all channels remains unknown until LE is driven high while valid input signals are present at the data inputs.