6 Detailed Description

6.1 Overview

The RCA-CD54/74AC373 and the CD54/74ACT373 octal transparent 3-state latches use the RCA ADVANCED

CMOS technology. The outputs are transparent to the inputs when the Latch Enable (LE) is HIGH. When

the Latch Enable (LE) goes LOW, the data is latched. The Output Enable (OE) controls the 3-state outputs.

When the Output Enable (OE) is HIGH, the outputs are in the high-impedance state. The latch operation is

independent of the state of the Output Enable.

The CD74AC/ACT373 are supplied in 20-lead dual-in-line plastic packages (E suffix) and in 20-lead dual-in-line

small-outline plastic packages (M suffix). Both package types are operable over the following temperature

ranges: Commercial (0 to 70°C); Industrial (-40 to +85°C); and Extended Industrial/Military (-55 to +125°C).

The CD54AC/ACT373, available in chip form (H suffix), are operable over the -55 to +125°C temperature range.

6.2 Functional Block Diagram

6.3 Functional Block Diagram

Table 6-1. Truth Table

Output Enable

Latch Enable

Data

AC/ACT373

Output

L

H

H

H

L

H

L

L

L

L

I

L

L

L

h

H

H

X

X

Z

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CD54AC373, CD74AC373, CD54ACT373, CD74ACT373

SCHS289A – DECEMBER 1998 – REVISED MAY 2024

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Product Folder Links: CD54AC373 CD74AC373 CD54ACT373 CD74ACT373