CD54HC190, CD74HC190

CD54HC191, CD74HC191, CD54HCT191, CD74HCT191

SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL

SCHS275E − MARCH 2002 − REVISED OCTOBER 2003

15

POST OFFICE BOX 655303

’HCT191

otherwise noted) (see Figure 5)

TA = 25°C

TA = −55°C

TO 125

°C

TA = −40°C

TO 85

°C

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

30

20

25

MHz

tw

Pulse duration

LOAD low

16

24

20

ns

tw

Pulse duration

CLK high or low

20

30

25

ns

Data before LOAD

↑

12

18

15

tsu

Setup time

CTEN before CLK

↑

12

18

15

ns

tsu

Setup time

D/U before CLK

↑

18

27

23

ns

Data before LOAD

↑

2

2

2

th

Hold time

CTEN before CLK

↑

2

2

2

ns

th

Hold time

D/U before CLK

↑

0

0

0

ns

trec

Recovery time

LOAD inactive before CLK

↑

12

18

15

ns

’HCT191

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted) (see Figure 5)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

LOAD

CAPACITANCE

VCC

TA = 25°C

TA = −55°C

TO 125

°C

TA = −40°C

TO 85

°C

UNIT

PARAMETER

(INPUT)

(OUTPUT)

CAPACITANCE

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

4.5 V

30

20

25

MHz

LOAD

Q

CL = 50 pF

4.5 V

40

60

50

LOAD

Q

CL = 15 pF

5 V

17

A, B, C,

Q

CL = 50 pF

4.5 V

38

57

48

A, B, C,

or D

Q

CL = 15 pF

5 V

16

CLK

RCO

CL = 50 pF

4.5 V

35

53

44

CLK

RCO

CL = 15 pF

5 V

14

CLK

Q

CL = 50 pF

4.5 V

27

41

34

tpd

CLK

Q

CL = 15 pF

5 V

11

ns

tpd

CLK

MAX/MIN

CL = 50 pF

4.5 V

42

63

53

ns

CLK

MAX/MIN

CL = 15 pF

5 V

18

D/U

RCO

CL = 50 pF

4.5 V

30

45

38

D/U

RCO

CL = 15 pF

5 V

12

D/U

MAX/MIN

CL = 50 pF

4.5 V

38

57

48

D/U

MAX/MIN

CL = 15 pF

5 V

16

CTEN

RCO

CL = 50 pF

4.5 V

27

41

34

CTEN

RCO

CL = 15 pF

5 V

11

tt

Any

CL = 50 pF

4.5 V

15

22

19

ns