74VHCT138ATTR 查看數據表（PDF） - STMicroelectronics

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74VHCT138ATTR

3 TO 8 LINE DECODER (INVERTING)

STMicroelectronics 

74VHCT138A

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

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Parameter

tPLH Propagation Delay

tPHL Time A, B, C to Y

tPLH Propagation Delay

tPHL Time G1 to Y

tPLH Propagation Delay

tPHL Time G2A, G2B to Y

(*) Voltage range is 5V ± 0.5V

Test Condition

V CC

CL

( V)

(pF)

5.0(*)

15

5.0(*)

50

5.0(*)

15

5.0(*)

50

5.0(*)

15

5.0(*)

50

Value

TA = 25 oC

Min. Typ. Max.

7.6 10.4

8.1 11.4

6.6 9.1

7.1 10.1

7.0 9.6

7.5 10.6

-40 to 85 oC

Min . Max.

1.0 12.0

1.0 13.0

1.0 10.5

1.0 11.5

1.0 11.0

1.0 12.0

Unit

ns

ns

ns

CAPACITIVE CHARACTERISTICS

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Parameter

Test Conditions

Value

Un it

TA = 25 oC

-40 to 85 oC

Min. Typ . Max. Min . Max.

CIN Input Capacitance

4

10

10

pF

CPD Power Dissipation

Capacitance (note 1)

49

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

TEST CIRCUIT

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

RT = ZOUT of pulse generator (typically 50Ω)

4/8

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