74ABT574 データシートの表示（PDF） - Fairchild Semiconductor

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74ABT574

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

Fairchild Semiconductor 

Functional Description

The ABT574 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 common to

all flip-flops. The eight flip-flops will store the state of their

individual D inputs that meet the setup and hold times

requirements on the LOW-to-HIGH Clock (CP) transition.

Function Table

With the Output Enable (OE) LOW, the contents of the

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

HIGH, the outputs are in a high impedance state. Opera-

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

flops.

OE

H

H

H

H

L

L

L

L

H HIGH Voltage Level

L LOW Voltage Level

X Immaterial

Z High Impedance

LOW-to-HIGH Transition

NC No Change

Logic Diagram

Inputs

CP

H or L

H or L









H or L

H or L

Internal Outputs

Function

D

Q

O

L

NC

Z

Hold

H

NC

Z

Hold

L

L

Z

Load

H

H

Z

Load

L

L

L

Data Available

H

H

H

Data Available

L

NC

NC No Change in Data

H

NC

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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