74ACT563 Просмотр технического описания (PDF) - Fairchild Semiconductor

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74ACT563

Octal Latch with 3-STATE Outputs

Fairchild Semiconductor 

Functional Description

The ACT563 contains eight D-type latches with 3-STATE

complementary 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 output will

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

LOW the latches store the information that was present on

Function Table

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

transition of LE. The 3-STATE buffers are controlled by the

Output Enable (OE) input. When OE is LOW, the buffers

are in the bi-state mode. When OE is HIGH the buffers are

in the high impedance mode but that does not interfere with

entering new data into the latches.

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

NC = No Change

Logic Diagram

Inputs

OE LE D

H XX

H HL

H HH

H LX

L HL

L HH

L LX

Internal

Q

X

H

L

NC

H

L

NC

Outputs Function

O

Z

High-Z

Z

High-Z

Z

High-Z

Z

Latched

H

Transparent

L

Transparent

NC Latched

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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