74AC138 データシートの表示（PDF） - STMicroelectronics

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74AC138

3 TO 8 LINE DECODER (INVERTING)

STMicroelectronics 

74AC138

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

Test Condition

Value

Symbol

Parameter

VCC

(V)

tPLH tPHL Propagation Delay

Time

A, B, C to Y

tPLH tPHL Propagation Delay

Time

G1 to Y

tPLH tPHL Propagation Delay

Time

G2A or G2B to Y

3.3(*)

5.0(**)

3.3(*)

5.0(**)

3.3(*)

5.0(**)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

1.5 5.5 10.5 1.5 14.0 1.5 15.4

ns

1.5 4.5 9.0 1.5 10.0 1.5 11.0

1.5 6.0 10.5 1.5 14.0 1.5 15.4

ns

1.5 4.5 11.0 1.5 10.0 1.5 11.0

1.5 5.5 10.5 1.5 12.7 1.5 14.0

ns

1.5 4.5 9.0 1.5 10.0 1.5 10.0

(*) Voltage range is 3.3V ± 0.3V

(**) Voltage range is 5.0V ± 0.5V

CAPACITIVE CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

CIN Input Capacitance 5.0

4

pF

CPD Power Dissipation 5.0

Capacitance

fIN = 10MHz

60

pF

(note 1)

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)

5/10

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