74ACT157(1997) 查看數據表（PDF） - STMicroelectronics

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74ACT157
(Rev.:1997)

QUAD 2 CHANNEL MULTIPLEXER

STMicroelectronics 

74ACT157

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)

Symbol

P ar ame te r

tPLH Propagation Delay Time

tPHL SELECT to Y

tPLH Propagation Delay Time

tPHL STROBE to Y

tPLH Propagation Delay Time

tPHL A, B to Y

(*) Voltage range is 5V ± 0.5V

Test Condition

V CC

(V)

5.0(*)

5.0(*)

5.0(*)

Value

TA = 25 oC

-40 to 85 oC

Min. Typ. Max. Min. Max.

1.5 5.5 9.0 1.0 10.0

Unit

ns

1.5 5.0 8.5 1.0 9.0 ns

1.5 4.0 7.0 1.0 8.5 ns

CAPACITIVE CHARACTERISTICS

Symbol

P ar ame te r

Test Conditions

V CC

(V)

Value

TA = 25 oC

-40 to 85 oC

Min. Typ. Max. Min. Max.

Unit

CIN Input Capacitance

5.0

4

pF

CPD Power Dissipation

5.0

Capacitance (note 1)

TDB

pF

1) 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 operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/n (per circuit)

TEST CIRCUIT

4/8

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