HD74LS191P 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS191P

Synchronous Up / Down 4-bit Binary Counter (single clock line)

Renesas Electronics 

HD74LS191

Switching Characteristics

(VCC = 5 V, Ta = 25°C)

Item

Symbol Inputs

Outputs

min.

typ.

max.

Unit Condition

Maximum clock

frequency

ƒmax

Clock

QA, QB, QC, QD

20

25

—

MHz

tPLH

tPHL

—

Load

QA, QB, QC, QD

—

22

33

33

50

ns

tPLH

tPHL

Data A,

—

B, C, D

QA, QB, QC, QD

—

20

27

32

40

ns

tPLH

—

Clock

Ripple Clock

13

20

ns

tPHL

—

16

24

Propagation

delay time

tPLH

tPHL

—

Clock

QA, QB, QC, QD

—

16

24

24

36

ns

CL = 15 pF,

RL = 2 kΩ

tPLH

Clock

Max / Min

tPHL

—

28

42

ns

—

37

52

tPLH

Down /

Ripple Clock

—

30

45

ns

tPHL

Up

—

30

45

tPLH

Down /

Max / Min

tPHL

Up

—

21

33

ns

—

22

33

tPLH

Enable

Ripple Clock

—

21

33

ns

tPHL

—

22

33

Rev.2.00, Feb.18.2005, page 5 of 10

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