HD74HC423A

Rev.2.00 Mar 30, 2006 page 4 of 8

Ta = 25

°C

Ta = –40 to +85

°C

Item

Min

Typ

Max

Min

Max

Unit

Test Conditions

2.0

—

—

210

—

265

4.5

—

20

42

—

53

6.0

—

—

36

—

45

ns

A or B to Q

2.0

—

—

240

—

300

4.5

—

21

48

—

60

6.0

—

—

41

—

51

ns

A or B to

Q

2.0

—

—

170

—

215

4.5

—

17

34

—

43

6.0

—

—

29

—

37

ns

Clear to Q

2.0

—

—

180

—

225

4.5

—

15

36

—

45

Propagation delay

time

6.0

—

—

31

—

38

ns

Clear to

Q

2.0

150

—

—

190

—

4.5

30

6

—

38

—

Pulse width

6.0

26

—

—

33

—

ns

A, B, Clear

2.0

0

—

—

5

—

4.5

0

–3

—

5

—

Removal time

6.0

0

—

—

5

—

ns

Clear

2.0

—

1.5

—

—

—

µs

Rext = 6 k

Ω

4.5

—

450

—

—

—

Minimum output

pulse width

6.0

—

380

—

—

—

ns

Cext = 28 pF

Rext = 2 k

Ω

Output pulse width

4.5

—

1.0

—

—

—

ms

Cext = 0.1

µF, Rext = 10 kΩ

2.0

—

—

75

—

95

4.5

—

5

15

—

19

Output rise/fall

time

6.0

—

—

13

—

16

ns

—

—

—

20

—

20

Pins 7 & 15

Input capacitance

Cin

—

—

5

10

—

10

pF

Other pins

Caution in use: In order to prevent any malfunctions due to noise, connect a highfrequency performance capacitor

as short as possible.

Test Circuit

L

*

C includes the probe and fig capacitance.

Note:

Measurement point

C

L