MC74AC563DW 데이터 시트보기 (PDF) - Motorola => Freescale

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MC74AC563DW

Octal D-Type Latch with 3-State Outputs

Motorola => Freescale 

MC74AC563 MC74ACT563

FUNCTIONAL DESCRIPTION

The MC74AC563/74ACT563 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 the D inputs a 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.

FUNCTION TABLE

Inputs

OE LE D

Internal Outputs

Q

O

Function

H

X

X

X

H

H

L

H

H

H

H

L

H

L

X

NC

L

H

L

H

L

H

H

L

L

L

X

NC

Z

High Z

Z

High Z

Z

High Z

Z

Latched

H

Transparent

L

Transparent

NC Latched

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

NC = No Change

LOGIC DIAGRAM

D0

D1

D2

D3

D4

D5

D6

D7

D

D

D

D

D

D

D

D

Q

Q

Q

Q

Q

Q

Q

Q

C

C

C

C

C

C

C

C

LE

OE

O1

O2

O3

O4

O5

O6

O7

O8

Please note that this diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation delays.

FACT DATA

5-2

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