74VHC238M datasheet(4/8 Pages) STMICROELECTRONICS

Teilenummer	74VHC238M

Bauteilbeschribung	3 TO 8 LINE DECODER

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CAPACITIVE CHARACTERISTICS

Symb ol

Parameter

T est Cond ition s

Val ue

Un it

TA =25

oC

-40 to 85

oC

Min.

Typ .

Max.

Min .

Max.

CIN

Input Capacitance

4

10

pF

CPD

Power Dissipation

Capacitance (note 1)

37

pF

1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto

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

• VCC • fIN +ICC

AC ELECTRICAL CHARACTERISTICS (Input tr =tf =3 ns)

Symb ol

Parameter

Test Co nditi on

Val ue

Un it

VCC

(V)

CL

(pF )

TA =25

oC

-40 to 85

oC

Min.

Typ .

Max.

Min .

Max.

tPLH

tPHL

Propagation Delay

Time

A, B, C to Y

3.3

(*)

15

8.0

12.3

1.0

14.5

ns

3.3

(*)

50

10.5

15.8

1.0

18.0

5.0

(**)

15

5.5

8.1

1.0

9.5

5.0

(**)

50

7.0

10.1

1.0

11.5

tPLH

tPHL

Propagation Delay

Time

G1 to Y

3.3

(*)

15

8.1

12.8

1.0

15.0

ns

3.3

(*)

50

10.6

16.3

1.0

18.5

5.0

(**)

15

5.4

8.1

1.0

9.5

5.0

(**)

50

6.9

10.1

1.0

11.5

tPLH

tPHL

Propagation Delay

Time

G2A, G2B to Y

3.3

(*)

15

8.1

12.3

1.0

14.5

ns

3.3

(*)

50

10.6

15.8

1.0

18.0

5.0

(**)

15

5.7

8.1

1.0

9.5

5.0

(**)

50

7.2

10.1

1.0

11.5

(*) Voltage range is 3.3V

± 0.3V

(**) Voltage range is 5V

± 0.5V

TEST CIRCUIT

CL = 15/50 pF or equivalent (includes jig and probe capacitance)

RL =R1 =500

Ω orequivalent

RT =ZOUT of pulse generator (typically 50

Ω)

74VHC238

4/8

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