HD74HC78 查看數據表（PDF） - Renesas Electronics

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HD74HC78

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

Renesas Electronics 

HD74HC78

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

Item

Maximum clock

frequency

Propagation delay

time

Pulse width

Setup time

Hold time

Removal time

Output rise/fall

time

Input capacitance

Symbol VCC (V)

fmax

2.0

4.5

6.0

tPLH, tPHL 2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

tw

2.0

4.5

6.0

tsu

2.0

4.5

6.0

th

2.0

4.5

6.0

trem

2.0

4.5

6.0

tTLH, tTHL 2.0

4.5

6.0

Cin

—

Ta = 25°C

Ta = –40 to +85°C

Min Typ Max Min Max Unit

Test Conditions

—— 6

—

5 MHz

— — 30

—

24

— — 35

—

28

— — 150 —

190 ns Clock to Q or Q

— 20 30

—

38

— — 26

—

33

— — 140 —

175 ns Clear to Q or Q

— 18 28

—

35

— — 24

—

30

— — 140 —

175 ns Preset to Q or Q

— 18 28

—

35

— — 24

—

30

80 — — 100

— ns Preset, Clear, Clock

16 8 —

20

—

14 — —

17

—

100 — — 125

— ns J or K to Clock

20 2 —

25

—

17 — —

21

—

5 ——

5

— ns Clock to J or K

5 –1 —

5

—

5 ——

5

—

100 — — 125

— ns Preset or Clear to Clock

20 0 —

25

—

17 — —

21

—

— — 75

—

95 ns

— 5 15

—

19

— — 13

—

16

— 5 10

—

10 pF

Test Circuit

VCC

VCC

Input

Pulse generator

Zout = 50 Ω

Input

Pulse generator

Zout = 50 Ω

Preset

Q

Clock

J

K

Q

Clear

Output

Output

CL = 50 pF

CL = 50 pF

Note: CL includes the probe and jig capacitance.

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

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