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74HC08 Folha de dados(PDF) 6 Page - Shanghai Leiditech Electronic Technology Co., Ltd |
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74HC08 Folha de dados(HTML) 6 Page - Shanghai Leiditech Electronic Technology Co., Ltd |
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6 / 15 page ![]() 10 Dynamic characteristics Table 7. Dynamic characteristics GND = 0 V; CL = 50 pF; for test circuit see Figure 7. 25 °C -40 °C to +125 °C Symbol Parameter Conditions Min Typ Max Max (85 °C) Max (125 °C) Unit 74HC08 nA, nB to nY; see Figure 6 [1] VCC = 2.0 V - 25 90 115 135 ns VCC = 4.5 V - 9 18 23 27 ns VCC = 5.0 V; CL = 15 pF - 7 - - - ns tpd propagation delay VCC = 6.0 V - 7 15 20 23 ns see Figure 6 [2] VCC = 2.0 V - 19 75 95 110 ns VCC = 4.5 V - 7 15 19 22 ns tt transition time VCC = 6.0 V - 6 13 16 19 ns CPD power dissipation capacitance per package; VI = GND to VCC [3] - 10 - - - pF 74HCT08 nA, nB to nY; see Figure 6 [1] VCC = 4.5 V - 14 24 30 36 ns tpd propagation delay VCC = 5.0 V; CL = 15 pF - 11 - - - ns tt transition time VCC = 4.5 V; see Figure 6 [2] - 7 15 19 22 ns CPD power dissipation capacitance per package; VI = GND to VCC - 1.5 V [3] - 20 - - - pF [1] tpd is the same as tPHL and tPLH. [2] tt is the same as tTHL and tTLH. [3] CPD is used to determine the dynamic power dissipation (PD in μW): PD = CPD × VCC2 × fi × N + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in V; N = number of inputs switching; ∑ (CL × VCC2 × fo) = sum of outputs. 74HC08; 74HCT08 Rev : www.leiditech.com 01.06.2015 6/15 |
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