M54HC148 datasheet(5/11 Pages) STMICROELECTRONICS

Il numero della parte	M54HC148

Spiegazioni elettronici	8 TO 3 LINE PRIORITY ENCODER

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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

(In - A0, A1, A2)

2.0

60

150

190

225

ns

4.5

19

30

38

45

6.0

16

26

32

38

tPLH

tPHL

Propagation

Delay Time

(In - EO, GS)

2.0

60

150

190

225

ns

4.5

19

30

38

45

6.0

16

26

32

38

tPLH

tPHL

Propagation

Delay Time

(EI - EO)

2.0

40

115

145

175

ns

4.5

14

23

29

35

6.0

12

20

25

30

tPLH

tPHL

Propagation

Delay Time

(EI - GS)

2.0

40

115

145

175

ns

4.5

14

23

29

35

6.0

12

20

25

30

tPLH

tPHL

Propagation

Delay Time

(EI - A0, A1, A2)

2.0

40

115

145

175

ns

4.5

14

23

29

35

6.0

12

20

25

30

CIN

Input Capacitance

5

10

pF

CPD (*)

Power Dissipation

Capacitance

60

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

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF

SWITCHING CHARACTERISTICS TEST.

SWITCHING CHARACTERISTICS TEST

CIRCUIT

TEST CIRCUIT ICC (Opr.)

M54/M74HC148

5/11

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