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M74HC243 датащи(PDF) 5 Page - STMicroelectronics |
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M74HC243 датащи(HTML) 5 Page - STMicroelectronics |
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5 / 11 page ![]() M74HC243 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 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 121518 6.0 6 101315 tPLH tPHL Propagation Delay Time 2.0 50 39 90 115 135 ns 4.5 13 18 23 27 6.0 11 15 20 23 2.0 150 51 145 180 220 ns 4.5 17 29 36 44 6.0 14 25 31 37 tPZL tPZH High Impedance Output Enable Time 2.0 50 RL = 1 KΩ 57 145 180 220 ns 4.5 18 29 36 44 6.0 15 25 31 37 2.0 150 RL = 1 KΩ 70 175 220 265 ns 4.5 22 35 44 53 6.0 19 30 37 45 tPLZ tPHZ High Impedance Output Disable Time 2.0 50 RL = 1 KΩ 45 150 190 225 ns 4.5 20 30 38 45 6.0 17 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 5.0 5 101010 pF CPD Power Dissipation Capacitance (note 1) 5.0 35 pF |
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