74ACT574SCX データシートの表示（PDF） - Fairchild Semiconductor

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74ACT574SCX

Octal D-Type Flip-Flop with 3-STATE Outputs

Fairchild Semiconductor 

Functional Description

The AC/ACT574 consists of eight edge-triggered flip-flops

with individual D-type inputs and 3-STATE true outputs.

The buffered clock and buffered Output Enable are com-

mon to all flip-flops. The eight flip-flops will store the state

of their individual D-type inputs that meet the setup and

hold time requirements on the LOW-to-HIGH Clock (CP)

transition. With the Output Enable (OE) LOW, the contents

of the eight flip-flops are available at the outputs. When OE

is HIGH, the outputs go to the high impedance state. Oper-

ation of the OE input does not affect the state of the flip-

flops.

Logic Diagram

Function Table

Inputs Internal Outputs

OE CP D Q

ON

Function

H H L NC

Z Hold

H H H NC

 H

L

L

 H

HH

 L

L

L

 L

HH

Z Hold

Z Load

Z Load

L Data Available

H Data Available

L H L NC

NC No Change in Data

L H H NC

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

= LOW-to-HIGH Transition

NC = No Change

NC No Change in Data

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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