74ACTQ533 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

MFG CO.

74ACTQ533

Quiet Series Octal Transparent Latch with 3-STATE Outputs

Fairchild Semiconductor 

Truth Table

Inputs

LE

OE

Dn

X

H

X

H

L

L

H

L

H

L

L

X

H = HIGH Voltage Level

L = LOW Voltage Level

Z = High Impedance

X = Immaterial

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

Outputs

On

Z

H

L

O0

Functional Description

The ACTQ533 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 con-

dition the latches are transparent, i.e., a latch output will

change state each time its D input changes. When LE is

LOW, the latches store the information that was present on

the D inputs at setup time preceding the HIGH-to-LOW

transition of LE. The 3-STATE standard outputs are con-

trolled 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.

Logic Diagram

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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