HD74HC78 datasheet(4/7 Pages) RENESAS

Part #	HD74HC78

Description	Dual J-K Flip-Flops (with Preset, Common Clear and Common Clock)

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Manufacturer	RENESAS [Renesas Technology Corp]

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4 / 7 page

HD74HC78

Rev.2.00, Oct 06, 2005 page 4 of 6

Switching Characteristics (CL = 50 pF, Input tr = tf = 6 ns)

Ta = 25

°C

Ta = –40 to +85

°C

Item

Symbol VCC (V)

Min

Typ

Max

Min

Max

Unit

Test Conditions

2.0

—

6

—

5

4.5

—

30

—

24

Maximum clock

frequency

fmax

6.0

—

35

—

28

MHz

2.0

—

150

—

190

4.5

—

20

30

—

38

6.0

—

26

—

33

ns

Clock to Q or

Q

2.0

—

140

—

175

4.5

—

18

28

—

35

6.0

—

24

—

30

ns

Clear to Q or

Q

2.0

—

140

—

175

4.5

—

18

28

—

35

Propagation delay

time

tPLH, tPHL

6.0

—

24

—

30

ns

Preset to Q or

Q

2.0

80

—

100

—

4.5

16

8

—

20

—

Pulse width

tw

6.0

14

—

17

—

ns

Preset, Clear, Clock

2.0

100

—

125

—

4.5

20

2

—

25

—

Setup time

tsu

6.0

17

—

21

—

ns

J or K to Clock

2.0

5

—

5

—

4.5

5

–1

—

5

—

Hold time

th

6.0

5

—

5

—

ns

Clock to J or K

2.0

100

—

125

—

4.5

20

0

—

25

—

Removal time

trem

6.0

17

—

21

—

ns

Preset or Clear to Clock

2.0

—

75

—

95

4.5

—

5

15

—

19

Output rise/fall

time

tTLH, tTHL

6.0

—

13

—

16

ns

Input capacitance

Cin

—

5

10

—

10

pF

Test Circuit

VCC

Clock

VCC

Zout = 50

Ω

Input

Clear

Zout = 50

Ω

Input

CL = 50 pF

Output

CL = 50 pF

Output

Q

J

K

Note: C includes the probe and jig capacitance.

L

Pulse generator

Preset

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