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HD74BC374A

Octal D Type Flip Flops With 3 State Outputs

Hitachi -> Renesas Electronics 

HD74BC374A

Octal D Type Flip Flops With 3 State Outputs

ADE-205-010A(Z)

Rev. 1

March 1993

Description

The HD74BC374A provides high drivability and operation equal to or better than high speed bipolar

standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5

of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight edge triger D type flip

flop with three state outputs in a 20 pin package. Data at the D inputs meeting set up reguirements, are

transferred to the Q outputs on positive going transitions of the clock input. When the latch enable goes

low, data at the D inputs will be retained at the outputs until latch enable returns high again. When a high

logic level is applied to the output control input, all outputs go to a high impedance state, regardless of what

signals are present at the other inputs and the state of the storage elements.

Features

• Input/Output are at high impedance state when power supply is off.

• Built in input pull up circuit can make input pins be open, when not used.

• TTL level input

• Wide operating temperature range

Ta = –40 to + 85°C

Function Table

Inputs

G

CK

nD

H

X

X

L

L

L

H

L

X

H : High level

L : Low level

X : Immaterial

Z : High impedance

: Low to high transition

Output

nQ

Z

L

H

No change

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