74VHCT373AM(1999) 데이터 시트보기 (PDF) - Fairchild Semiconductor

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74VHCT373AM
(Rev.:1999)

Octal D-Type Latch with 3-STATE Outputs

Fairchild Semiconductor 

Functional Description

The VHCT373A 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 input changes. When

LE is LOW, the latches store the information that was

present on the D 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.

Truth Table

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

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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