74VHCT374A(2005) データシートの表示（PDF） - Fairchild Semiconductor

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74VHCT374A
(Rev.:2005)

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

Fairchild Semiconductor 

Pin Descriptions

Truth Table

Pin Names

D0–D7

CP

OE

O0–O7

Description

Data Inputs

Clock Pulse Input 3-STATE

Output Enable Input 3-STATE

Outputs

Functional Description

The VHCT374A 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 inputs that meet the setup and hold

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

Inputs

Outputs

Dn

H

CP

OE



L

On

H

L



L

L

X

X

H

Z

H HIGH Voltage Level

L LOW Voltage Level

X Immaterial

Z High Impedance

LOW-to-HIGH Transition

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

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

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

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

flops.

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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