From (Input)

Symbol

Parameter

To (Output)

Units

Min

Max

Min

Max

Maximum Clock

25

20

MHz

Frequency

Propagation Delay Time

Clock to

35

39

ns

Low to High Level Output

Ripple Carry

Propagation Delay Time

Clock to

35

44

ns

High to Low Level Output

Ripple Carry

Propagation Delay Time

Clock to

20

24

ns

Low to High Level Output

Any Q

Propagation Delay Time

Clock to

23

32

ns

High to Low Level Output

Any Q

Propagation Delay Time

Enable T to

18

24

ns

Low to High Level Output

Ripple Carry

Propagation Delay Time

Enable T to

18

28

ns

High to Low Level Output

Ripple Carry

Propagation Delay Time

UpDown to

25

30

ns

Low to High Level Output

Ripple Carry (Note 1)

Propagation Delay Time

UpDown to

29

38

ns

High to Low Level Output

Ripple Carry (Note 1)

Note 1

The propagation delay from UPDOWN to RIPPLE CARRY must be measured with the counter at either a minimum or a maximum count As the logic level

of the updown input is changed the ripple carry output will follow If the count is minimum the ripple carry output transition will be in phase If the count is

maximum the ripple carry output will be out of phase

3