74AC138M datasheet(5/10 Pages) STMICROELECTRONICS

Numer części	74AC138M

Szczegółowy opis	3 TO 8 LINE DECODER (INVERTING)

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Producent	STMICROELECTRONICS [STMicroelectronics]

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74AC138

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

(*) Voltage range is 3.3V

± 0.3V

(**) Voltage range is 5.0V

± 0.5V

CAPACITIVE CHARACTERISTICS

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 x VCC x fIN + ICC/n (per circuit)

TEST CIRCUIT

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

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

tPLH tPHL Propagation Delay

Time

A, B, C to Y

3.3(*)

1.5

5.5

10.5

1.5

14.0

1.5

15.4

ns

5.0(**)

1.5

4.5

9.0

1.5

10.0

1.5

11.0

tPLH tPHL Propagation Delay

Time

G1 to Y

3.3(*)

1.5

6.0

10.5

1.5

14.0

1.5

15.4

ns

5.0(**)

1.5

4.5

11.0

1.5

10.0

1.5

11.0

tPLH tPHL Propagation Delay

Time

G2A or G2B to Y

3.3(*)

1.5

5.5

10.5

1.5

12.7

1.5

14.0

ns

5.0(**)

1.5

4.5

9.0

1.5

10.0

1.5

10.0

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

CIN

Input Capacitance

5.0

4

pF

CPD

Power Dissipation

Capacitance

(note 1)

5.0

fIN = 10MHz

60

pF

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