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M74HC640 Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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M74HC640 Scheda tecnica(HTML) 5 Page - STMicroelectronics |
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5 / 11 page ![]() M74HC640 5/11 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns) 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 circuit) Symbol Parameter Test Condition Value Unit VCC (V) CL (pF) TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. tTLH tTHL Output Transition Time 2.0 50 25 60 75 90 ns 4.5 7 121918 6.0 6 101315 tPLH tPHL Propagation Delay Time 2.0 50 33 90 115 135 ns 4.5 12 18 23 27 6.0 10 15 20 23 2.0 150 48 120 150 180 ns 4.5 16 24 30 36 6.0 14 20 26 31 tPZL tPZH High Impedance Output Enable Time 2.0 50 RL = 1 KΩ 48 150 190 225 ns 4.5 16 30 38 45 6.0 14 26 32 38 2.0 150 RL = 1 KΩ 63 180 225 270 ns 4.5 21 36 45 54 6.0 18 31 38 46 tPLZ tPHZ High Impedance Output Disable Time 2.0 50 RL = 1 KΩ 37 150 190 225 ns 4.5 17 30 38 45 6.0 15 26 32 38 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 DIR, G 5 101010 pF CI/OUT Output Capacitance An, Bn 13 pF CPD Power Dissipation Capacitance (note 1) 37 pF |
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