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HD74LS191 Datasheet(PDF) 5 Page - Renesas Technology Corp |
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HD74LS191 Datasheet(HTML) 5 Page - Renesas Technology Corp |
5 / 11 page HD74LS191 Rev.2.00, Feb.18.2005, page 5 of 10 Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Symbol Inputs Outputs min. typ. max. Unit Condition Maximum clock frequency ƒmax Clock QA, QB, QC, QD 20 25 — MHz tPLH — 22 33 tPHL Load QA, QB, QC, QD — 33 50 ns tPLH — 20 32 tPHL Data A, B, C, D QA, QB, QC, QD — 27 40 ns tPLH — 13 20 tPHL Clock Ripple Clock — 16 24 ns tPLH — 16 24 tPHL Clock QA, QB, QC, QD — 24 36 ns tPLH — 28 42 tPHL Clock Max / Min — 37 52 ns tPLH — 30 45 tPHL Down / Up Ripple Clock — 30 45 ns tPLH — 21 33 tPHL Down / Up Max / Min — 22 33 ns tPLH — 21 33 Propagation delay time tPHL Enable Ripple Clock — 22 33 ns CL = 15 pF, RL = 2 k Ω |
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