MC74LCX574 datasheet(2/9 Pages) ONSEMI

Part #	MC74LCX574

Description	Low-Voltage CMOS Octal D-Type Flip-Flop Flow Through Pinout

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MC74LCX574

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Figure 1. Pinout: 20−Lead (Top View)

19

20

18

17

16

15

14

2

1

3456

7

VCC

13

8

12

9

11

10

O0

O1

O2

O3

O4

O5

O6

O7

CP

OE

D0

D1

D2

D3

D4

D5

D6

D7

GND

Figure 2. Logic Diagram

PIN NAMES

Function

Output Enable Input

Clock Pulse Input

Data Inputs

3−State Outputs

Pins

OE

CP

D0−D7

O0−O7

O0

D0

O1

D1

O2

D2

O3

D3

O4

D4

O5

D5

O6

D6

O7

D7

CP

Q

D

CP

Q

D

CP

Q

D

CP

Q

D

CP

Q

D

CP

Q

D

CP

Q

D

CP

Q

D

CP

OE

11

1

2

3

4

5

6

7

8

9

19

18

17

16

15

14

13

12

TRUTH TABLE

INPUTS

INTERNAL

LATCHES

OUTPUTS

OE

CP

Dn

Q

On

OPERATING MODE

L

↑

l

h

L

H

L

H

Load and Read Register

L

↑

X

NC

Hold and Read Register

H

↑

X

NC

Z

Hold and Disable Outputs

H

↑

l

h

L

H

Z

Load Internal Register and Disable Outputs

H

= High Voltage Level

h

= High Voltage Level One Setup Time Prior to the Low−to−High Clock Transition

L

= Low Voltage Level

l

= Low Voltage Level One Setup Time Prior to the Low−to−High Clock Transition

NC = No Change

X

= High or Low Voltage Level and Transitions are Acceptable

Z

= High Impedance State

↑

= Low−to−High Transition

↑

= Not a Low−to−High Transition; For ICC Reasons, DO NOT FLOAT Inputs

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ON Semiconductor	MC74LCX574	91Kb / 8P	Low-Voltage CMOS Octal D-Type Flip-Flop Flow Through Pinout With 5 V?뭈olerant Inputs and Outputs (3?뭆tate, Non?묲nverting) February, 2005 ??Rev. 5
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