74VHC238TTR datasheet(5/12 Pages) STMICROELECTRONICS

部件名	74VHC238TTR

功能描述	3 TO 8 LINE DECODER

PDF	12 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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5 / 12 page

74VHC238

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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

410

CPD

Power Dissipation

Capacitance

(note 1)

74VHC238TTR 数据表(PDF) 5 Page - STMicroelectronics