74VHC138 datasheet(5/12 Pages) STMICROELECTRONICS

Part #	74VHC138

Description	3 TO 8 LINE DECODER (INVERTING)

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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74VHC138

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Table 8: 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

Figure 4: Test Circuit

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

RT = ZOUT of pulse generator (typically 50Ω)

Figure 5: Waveform - Propagation Delays For Inverting Outputs (f=1MHz; 50% duty cycle)

Symbol

Parameter

Test Condition

Value

Unit

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

CIN

Input Capacitance

610

10

pF

CPD

Power Dissipation

Capacitance

(note 1)

34

pF

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