74HC157 datasheet(6/11 Pages) STMICROELECTRONICS

No. de pieza	74HC157

Descripción Electrónicos	HCT157 QUAD 2 CHANNEL MULTIPLEXER HCT158 QUAD 2 CHANNEL MULTIPLEXER (INV)

PDF	11 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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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

54HC and 74HC

-40 to 85

74HC

-55 to 125

54HC

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

tTLH

tTHL

Output Transition

Time

4.5

151922

tPLH

tPHL

Propagation

Delay Time

(A, B - Y)

4.5

tPLH

tPHL

Propagation

Delay Time

(SELECT - Y)

4.5

tPLH

tPHL

Propagation

Delay Time

(STROBE - Y)

4.5

CIN

Input Capacitance

CPD (*)

Power Dissipation

Capacitance

HCT157

HCT158

(*) 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/4 (per channel)

SWITCHING CHARACTERISTICS TEST CIR-

CUIT

TEST CIRCUIT ICC (Opr.)

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF

SWITCHING CHARACTERISTICS TEST.

M54/M74HCT157 M54/M74HCT158

6/11

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