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MC74AC574MEL
(Rev.:2001)

Octal D Flip-Flop with 3-State Outputs

ON Semiconductor 

MC74AC574, MC74ACT574

D0 D1 D2 D3 D4 D5 D6 D7

CP

OE

O0 O1 O2 O3 O4 O5 O6 O7

Figure 2. Logic Symbol

FUNCTIONAL DESCRIPTION

The MC74AC574/74ACT574 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 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.

FUNCTION TABLE

Inputs

OE CP D

H

H

L

H

H

H

H

L

H

H

L

L

L

H

L

H

L

L

H

H

Internal

Q

NC

NC

L

H

L

H

NC

NC

Outputs

On

Z

Z

Z

Z

L

H

NC

NC

Function

Hold

Hold

Load

Load

Data Available

Data Available

No Change in Data

No Change in Data

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

= LOW-to-HIGH Clock Transition

NC = No Change

D0

D1

D2

D3

D4

D5

D6

D7

CP

CD

Q

CD

Q

CD

Q

CD

Q

CD

Q

CD

Q

CD

Q

CD

Q

OE

O0

O1

O2

O3

O4

O5

O6

O7

NOTE: 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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