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MC74ACT374DT

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

ON Semiconductor 

TRUTH TABLE

Inputs

Dn

CP

H

L

X

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

= LOW-to-HIGH Transition

D0

CP

CP D

QQ

MC74AC374, MC74ACT374

Outputs

OE

On

L

H

L

L

H

Z

D1

D2

FUNCTIONAL DESCRIPTION

The MC74AC374/74ACT374 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 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 HIGH, the outputs go to the high

impedance state. Operation of the OE input does not affect

the state of the flip–flops.

D3

D4

D5

D6

D7

CP D

QQ

CP D

QQ

CP D

QQ

CP D

QQ

CP D

QQ

CP D

QQ

CP D

QQ

OE

O0

O1

O2

O3

O4

O5

O6

O7

NOTE: That this diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation delays.

Figure 3. Logic Diagram

MAXIMUM RATINGS*

Symbol

Parameter

Value

Unit

VCC

VIN

VOUT

IIN

IOUT

ICC

Tstg

DC Supply Voltage (Referenced to GND)

DC Input Voltage (Referenced to GND)

DC Output Voltage (Referenced to GND)

DC Input Current, per Pin

DC Output Sink/Source Current, per Pin

DC VCC or GND Current per Output Pin

Storage Temperature

–0.5 to +7.0

V

–0.5 to VCC +0.5

V

–0.5 to VCC +0.5

V

±20

mA

±50

mA

±50

mA

–65 to +150

°C

*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the

Recommended Operating Conditions.

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