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74LCX139MTR Datasheet(PDF) 5 Page - STMicroelectronics |
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74LCX139MTR Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 12 page 74LCX139 5/12 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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