December 1990

6

Philips Semiconductors

Product specification

Dual decade ripple counter

74HC/HCT390

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

Output capability: standard

Note to HCT types

The value of additional quiescent supply current (

To determine

AC CHARACTERISTICS FOR 74HCT

INPUT

UNIT LOAD COEFFICIENT

0.45

0.60

SYMBOL

PARAMETER

UNIT

TEST CONDITIONS

74HCT

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min.

typ.

max. min. max. min.

max.

propagation delay

21

34

43

51

ns

4.5

Fig.6

propagation delay

22

38

48

57

ns

4.5

Fig.6

propagation delay

30

51

64

77

ns

4.5

Fig.6

propagation delay

22

38

48

57

ns

4.5

Fig.6

propagation delay

21

36

45

54

ns

4.5

Fig.7

output transition time

7

15

19

22

ns

4.5

Fig.6

clock pulse width

18

8

23

27

ns

4.5

Fig.6

master reset pulse width

HIGH

17

10

21

26

ns

4.5

Fig.7

removal time

15

8

19

22

ns

4.5

Fig.7

maximum clock pulse

frequency

27

55

22

18

MHz

4.5

Fig.6