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74ACT373
(Rev.:2005)

Octal Transparent Latch with 3-STATE Outputs

Fairchild Semiconductor 

Logic Symbols

IEEE/IEC

Connection Diagram

Logic Diagram

Pin Descriptions

Pin Names

D0–D7

LE

OE

O0–O7

Truth Table

Description

Data Inputs

Latch Enable Input

Output Enable Input

3-STATE Latch Outputs

Inputs

Outputs

LE

OE

Dn

On

X

H

X

Z

H

L

L

L

H

L

H

H

L

L

X

O0

H HIGH Voltage Level

L LOW Voltage Level

Z High Impedance

X Immaterial

O0 Previous O0 before HIGH-to-LOW transition of Latch Enable

Functional Description

The AC/ACT373 contains eight D-type latches with 3-

STATE standard outputs. When the Latch Enable (LE)

input is HIGH, data on the Dn inputs enters the latches. In

this condition the latches are transparent, i.e., a latch out-

put will change state each time its D-type input changes.

When LE is LOW, the latches store the information that

was present on the D-type inputs a setup time preceding

the HIGH-to-LOW transition of LE. The 3-STATE standard

outputs are controlled by the Output Enable (OE) input.

When OE is LOW, the standard outputs are in the 2-state

mode. When OE is HIGH, the standard outputs are in the

high impedance mode but this does not interfere with

entering new data into the latches.

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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