74LCX139TTR(2004) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

74LCX139TTR
(Rev.:2004)

LOW VOLTAGE CMOS DUAL 2 TO 4 DECODER/DEMULTIPLEXER

STMicroelectronics 

74LCX139

Table 8: Capacitive Characteristics

Test Condition

Value

Symbol

Parameter

VCC

(V)

CIN Input Capacitance

3.3

CPD Power Dissipation Capacitance

3.3

(note 1)

VIN = 0 to VCC

fIN = 10MHz

VIN = 0 or VCC

TA = 25 °C

Unit

Min. Typ. Max.

6

pF

26

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/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)

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