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74VHCT74A Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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74VHCT74A Scheda tecnica(HTML) 5 Page - STMicroelectronics |
5 / 14 page 74VHCT74A 5/14 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 4: Test Circuit CL =15/50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50Ω) 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 610 10 10 pF CPD Power Dissipation Capacitance (note 1) 21 pF |
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