SN74HCT373PWRE4

Latches Overview

The SN74HCT373PWRE4 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 a temperature range of -40°C to +85°C. The device features high-current outputs capable of driving up to 15 LSTTL loads, with typical propagation delays of 21 ns at 5 V. It utilizes a 20-pin TSSOP package.

Latches Feature Summary

• Transparent D-type latching mechanism where outputs follow inputs during the enable phase
• Three-state output capability for bus-driven applications without interface components
• TTL-voltage compatible inputs ensuring compatibility with standard logic families

Latches Applications

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

Latches Procurement Notes

Verify the E4 suffix indicates lead-free composition and RoHS compliance. Confirm the PWRE4 designation corresponds to the TSSOP-20 package in tape and reel format. Ensure the component status matches current production requirements as datasheets may indicate obsolescence for specific variants.

Latches Selection Notes

Select this component when TTL-compatible input levels are required alongside CMOS performance. The HCT series ensures direct interfacing with TTL devices. Verify that the 3-state outputs meet the impedance requirements for the target bus architecture and that the operating voltage aligns with the 5 V system rail.

Latches Part Context

This part belongs to the SNx4HCT373 family of octal transparent D-type latches. The family includes variants with different packages such as SOIC, PDIP, and CDIP. The E4 suffix typically denotes environmental compliance and lead finish specifications within the Texas Instruments product line.

Latches Replacement Considerations

SN74HCT373PWR

Latches FAQ

How does the OE pin affect internal latch operations?

The Output Enable (OE) pin places outputs in a high-impedance state but does not affect the internal operation of the latches. Data can be retained or entered while outputs are disabled.

What is the function of the LE input?

The Latch Enable (LE) input controls transparency. When LE is high, Q outputs follow D inputs. When LE goes low, the data present at the D inputs is latched at the Q outputs.