MC74HC74A

http://onsemi.com

2

RESET 1

DATA 1

CLOCK 1

SET 1

RESET 2

DATA 2

CLOCK 2

SET 2

1

2

3

4

13

12

11

10

5

6

9

8

Q1

Q1

Q2

Q2

PIN 7 = GND

FUNCTION TABLE

Inputs

Outputs

Set Reset Clock Data

Q

Q

LH

X

X

HL

HL

X

X

LH

L

L

X

X

H*

H*

HH

H

H

L

HH

L

L

H

H

H

L

X

No Change

H

H

H

X

No Change

H

H

X

No Change

*Both outputs will remain high as long as Set and Reset are low, but the output

states are unpredictable if Set and Reset go high simultaneously.

LOGIC DIAGRAM

PIN ASSIGNMENT

SET 1

CLOCK 1

DATA 1

RESET 1

11

12

13

14

8

9

10

5

4

3

2

1

7

6

SET 2

CLOCK 2

DATA 2

RESET 2

Q2

Q2

GND

Q1

Q1

MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

DC Supply Voltage (Referenced to GND)

– 0.5 to + 7.0

V

DC Input Voltage (Referenced to GND)

V

DC Output Voltage (Referenced to GND)

V

DC Input Current, per Pin

± 20

mA

DC Output Current, per Pin

± 25

mA

± 50

mA

Power Dissipation in Still Air,

Plastic DIP†

SOIC Package†

TSSOP Package†

750

500

450

mW

Storage Temperature

– 65 to + 150

_C

Lead Temperature, 1 mm from Case for 10 Seconds

(Plastic DIP, SOIC or TSSOP Package)

260

300

_C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress

ratings only. Functional operation above the Recommended Operating Conditions is not implied.

Extended exposure to stresses above the Recommended Operating Conditions may affect device

reliability.

†Derating — Plastic DIP: – 10 mW/_C from 65_ to 125_C

SOIC Package: – 7 mW/_C from 65_ to 125_C

TSSOP Package: − 6.1 mW/_C from 65_ to 125_C

RECOMMENDED OPERATING CONDITIONS

Symbol

Parameter

Min

Max

Unit

DC Supply Voltage (Referenced to GND)

2.0

6.0

V

0

V

Operating Temperature, All Package Types

– 55

+ 125

_C

Input Rise and Fall Time

(Figures 1, 2, 3)

0

0

0

0

1000

600

500

400

ns

This device contains protection

circuitry to guard against damage

due to high static voltages or electric

fields. However, precautions must

be taken to avoid applications of any

voltage higher than maximum rated

voltages to this high−impedance cir-

Unused inputs must always be

tied to an appropriate logic voltage

Unused outputs must be left open.