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74LCX139 датащи(PDF) 5 Page - STMicroelectronics

номер детали 74LCX139
подробное описание детали  LOW VOLTAGE CMOS DUAL 2 TO 4 DECODER/DEMULTIPLEXER
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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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
26
pF


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