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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M74HC573 датащи(PDF) 6 Page - STMicroelectronics |
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M74HC573 датащи(HTML) 6 Page - STMicroelectronics |
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6 / 12 page  M74HC573 6/12 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/8 (per Flip Flop) and the CPD when n pcs of Flip Flop operate, can be gained by the following equation: CPD(TOTAL) = 33 + 18 x n (pF) TEST CIRCUIT CL = 50pF/150pF or equivalent (includes jig and probe capacitance) R1 = 1KΩ or equivalent RT = ZOUT of pulse generator (typically 50Ω) Symbol Parameter Test Condition Value Unit VCC (V) TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. CIN Input Capacitance 510 10 10 pF COUT Output Capacitance 10 pF CPD Power Dissipation Capacitance (note 1) 51 pF TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VCC tPZH, tPHZ GND |
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