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74ACT533SC

Octal Transparent Latch with 3-STATE Outputs

Fairchild Semiconductor 

Functional Description

The ACT533 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

Truth Table

Inputs

Outputs

LE

OE

Dn

On

X

H

X

Z

H

L

L

H

H

L

H

L

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

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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