74LCX139 datasheet(5/12 Pages) STMICROELECTRONICS

部件名	74LCX139

功能描述	LOW VOLTAGE CMOS DUAL 2 TO 4 DECODER/DEMULTIPLEXER

PDF	12 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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74LCX139

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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/2 (per gate)

Figure 5: Test Circuit

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

RL = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Figure 6: Waveform - Propagation Delays For Inverting Outputs (f=1MHz; 50% duty cycle)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25 °C

Min.

Typ.

Max.

CIN

Input Capacitance

3.3

VIN = 0 to VCC

6pF

CPD

Power Dissipation Capacitance

(note 1)

3.3

fIN = 10MHz

VIN = 0 or VCC

74LCX139 数据表(PDF) 5 Page - STMicroelectronics