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M74HC251B1R. 数据表(PDF) 5 Page - STMicroelectronics |
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M74HC251B1R. 数据表(HTML) 5 Page - STMicroelectronics |
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5 / 11 page ![]() M74HC251 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) 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 30 75 95 115 ns 4.5 8 151923 6.0 7 131620 tPLH tPHL Propagation Delay Time (D - Y, W) 2.0 64 130 165 195 ns 4.5 16 26 33 39 6.0 14 22 28 33 tPHL Propagation Delay Time (A, B, C -Y, W) 2.0 80 160 200 240 ns 4.5 20 32 40 48 6.0 17 27 34 41 tPZL tPZH High Impedance Output Enable Time 2.0 RL = 1 KΩ 36 90 115 135 ns 4.5 11 18 23 27 6.0 9 152023 tPLZ tPHZ High Impedance Output Disable Time 2.0 RL = 1 KΩ 26 85 105 130 ns 4.5 13 17 21 26 6.0 11 14 18 22 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 62 pF |
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