74191 datasheet(5/6 Pages) FAIRCHILD

Part #	74191

Description	Synchronous 4-Bit Up/Down Counter with Mode Control

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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AC Electrical Characteristics

From (Input)

RL = 2 kΩ

Symbol

Parameter

To (Output)

CL = 15 pF

CL = 50 pF

Units

Min

Max

Min

Max

fMAX

Maximum Clock

20

MHz

Frequency

tPLH

Propagation Delay Time

Load to

33

43

ns

LOW-to-HIGH Level Output

Any Q

tPHL

Propagation Delay Time

Load to

50

59

ns

HIGH-to-LOW Level Output

Any Q

tPLH

Propagation Delay Time

Data to

22

26

ns

LOW-to-HIGH Level Output

Any Q

tPHL

Propagation Delay Time

Data to

50

62

ns

HIGH-to-LOW Level Output

Any Q

tPLH

Propagation Delay Time

Clock to

20

24

ns

LOW-to-HIGH Level Output

Ripple Clock

tPHL

Propagation Delay Time

Clock to

24

33

ns

HIGH-to-LOW Level Output

Ripple Clock

tPLH

Propagation Delay Time

Clock to

24

29

ns

LOW-to-HIGH Level Output

Any Q

tPHL

Propagation Delay Time

Clock to

36

45

ns

HIGH-to-LOW Level Output

Any Q

tPLH

Propagation Delay Time

Clock to

42

47

ns

LOW-to-HIGH Level Output

Max/Min

tPHL

Propagation Delay Time

Clock to

52

65

ns

HIGH-to-LOW Level Output

Max/Min

tPLH

Propagation Delay Time

Up/Down to

45

50

ns

LOW-to-HIGH Level Output

Ripple Clock

tPHL

Propagation Delay Time

Up/Down to

45

54

ns

HIGH-to-LOW Level Output

Ripple Clock

tPLH

Propagation Delay Time

Down/Up to

33

36

ns

LOW-to-HIGH Level Output

Max/Min

tPHL

Propagation Delay Time

Down/Up to

33

42

ns

HIGH-to-LOW Level Output

Max/Min

tPLH

Propagation Delay Time

Enable to

33

36

ns

LOW-to-HIGH Level Output

Ripple Clock

tPHL

Propagation Delay Time

Enable to

33

42

ns

HIGH-to-LOW Level Output

Ripple Clock

Similar Part No. - 74191

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74191 Datasheet(PDF) 5 Page - Fairchild Semiconductor

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