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HD74LS74AFPEL 数据表(PDF) 3 Page - Renesas Technology Corp |
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HD74LS74AFPEL 数据表(HTML) 3 Page - Renesas Technology Corp |
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3 / 8 page ![]() HD74LS74A Preliminary R04DS0012EJ0400 Rev.4.00 Page 3 of 7 Dec 21, 2011 Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Symbol Inputs Outputs min. typ. max. Unit Condition Maximum clock frequency fmax 25 33 MHz tPLH — 13 25 ns Propagation delay time tPHL Clear, Clock or Preset Q, Q — 25 40 ns CL = 15 pF, RL = 2 k Timing Definition Data Clock 0 V 3 V 0 V 3 V 1.3 V1.3 V 1.3 V1.3 V 1.3 V 1.3 V "H" Data "L" Data tw tsu th tsu th |
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