74VHC574M 查看數據表（PDF） - Fairchild Semiconductor

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74VHC574M

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

Fairchild Semiconductor 

Functional Description

Truth Table

The VHC574 consists of eight edge-triggered flip-flops with

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

Inputs

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 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 the OE is

Dn

H

CP



OE

L

L



L

X

X

H

HIGH, the outputs go to the high impedance state. Opera-

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

flops.

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

= LOW-to-HIGH Transition

Outputs

On

H

L

Z

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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