74VHC238MTR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

74VHC238MTR

3 TO 8 LINE DECODER

STMicroelectronics 

74VHC238

Table 8: Capacitive Characteristics

Test Condition

Value

Symbol

Parameter

CIN Input Capacitance

CPD Power Dissipation

Capacitance

(note 1)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

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

4 10

10

10 pF

18

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 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)

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