M74HC251B1R datasheet(5/11 Pages) STMICROELECTRONICS

Part #	M74HC251B1R

Description	8 BIT SIPO SHIFT REGISTER

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AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns)

Symbol

Parameter

Test Conditions

Value

Unit

VCC

(V)

TA =25

oC

54HC and 74HC

-40 to 85

oC

74HC

-55 to 125

oC

54HC

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

tTLH

tTHL

Output Transition

Time

2.0

30

75

95

110

ns

4.5

8

151922

6.0

7

131619

tPLH

tPHL

Propagation

Delay Time

(D - Y, W)

2.0

64

130

165

195

ns

4.5

16

26

33

39

6.0

14

22

28

33

tPLH

tPHL

Propagation

Delay Time

(A, B, C - Y, W)

2.0

80

160

200

240

ns

4.5

20

32

40

48

6.0

17

27

34

41

tPZL

tPZH

Output Enable

Time

2.0

RL =1 K

Ω

36

90

115

135

ns

4.5

11

18

23

27

6.0

9

152023

tPLZ

tPHZ

Output Disable

Time

2.0

RL =1 K

Ω

26

85

105

130

ns

4.5

13

17

21

26

6.0

11

14

18

22

CIN

Input Capacitance

5

10

pF

CPD (*)

Power Dissipation

Capacitance

62

pF

(*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.

(Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD

•VCC •fIN +ICC

TEST WAVEFORM ICC (Opr.)

* INPUT WAVEFORM TIME IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTICS TEST.

M54/M74HC251

5/11

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