SN74AHCT373DBR

Overview

The SN74AHCT373DBR 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 balanced CMOS outputs capable of sourcing and sinking up to 8mA. At a 5V supply with a 15pF load, the average propagation delay is 9.5ns. It is housed in a 20-pin SSOP package.

Feature Summary

• Features eight D-type latches sharing common latch enable (LE) and output enable (OE) control lines.
• Includes balanced CMOS 3-state outputs that can actively drive high or low, or enter a high-impedance state.
• Inputs are designed for TTL compatibility, allowing direct interfacing with standard logic devices.

Applications

• Parallel data storage
• Digital bus buffer

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP-20 package and tape-and-reel shipping configuration. Confirm the component meets RoHS compliance standards as indicated in the datasheet. Ensure the intended operating temperature range aligns with the commercial grade specifications provided for this part number.

Selection Notes

Select this component when an octal latch with 3-state outputs is required for systems operating at 5V. The AHCT series ensures compatibility with TTL logic levels while maintaining CMOS performance characteristics. Consider the SSOP package dimensions for PCB layout constraints and verify thermal requirements against the junction-to-ambient rating.

Part Context

This device belongs to the SNx4AHCT373 family of octal transparent D-type latches. It shares functional similarities with other members like the SN74HCT373 but offers improved speed and lower power consumption typical of the Advanced High-CMOS technology. The DBR suffix specifically denotes the surface-mount SSOP packaging variant.

Replacement Considerations

SN74HCT373DBR

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 output state 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 with valid input signals at the data inputs.