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74LS221N Datasheet(PDF) 4 Page - Motorola, Inc |
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74LS221N Datasheet(HTML) 4 Page - Motorola, Inc |
4 / 7 page 5-383 FAST AND LS TTL DATA SN54/74LS221 AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C) Symbol From (Input) To (Output) Limits Unit Test Conditions Symbol From (Input) To (Output) Min Typ Max Unit Test Conditions tPLH A Q 45 70 ns CL = 15 pF, See Figure 1 Cext = 80 pF, Rext = 2.0 Ω tPLH B Q 35 55 ns CL = 15 pF, See Figure 1 Cext = 80 pF, Rext = 2.0 Ω tPHL A Q 50 80 ns CL = 15 pF, See Figure 1 Cext = 80 pF, Rext = 2.0 Ω tPHL B Q 40 65 ns CL = 15 pF, See Figure 1 Cext = 80 pF, Rext = 2.0 Ω tPHL Clear Q 35 55 ns CL = 15 pF, See Figure 1 tPLH Clear Q 44 65 ns CL = 15 pF, See Figure 1 tW(out) A or B Q or Q 70 120 150 ns Cext = 80 pF, Rext = 2.0 Ω tW(out) A or B Q or Q 20 47 70 ns Cext = 0, Rext = 2.0 kΩ tW(out) A or B Q or Q 600 670 750 Cext = 100 pF, Rext = 10 kΩ 6.0 6.9 7.5 ms Cext = 1.0 µF, Rext = 10 kΩ AC SETUP REQUIREMENTS (VCC = 5.0 V, TA = 25°C) Symbol Parameter Limits Unit Symbol Parameter Min Typ Max Unit dv/dt Rate of Rise or Fall of Input Pulse dv/dt Schmitt, B 1.0 V/s dv/dt Logic Input, A 1.0 V/ µs tW Input Pulse Width tW A or B, tW(in) 40 ns tW Clear, tW (clear) 40 ts Clear-Inactive-State Setup Time 15 ns Rext External Timing Resistance 54 1.4 70 k Ω Rext External Timing Resistance 74 1.4 100 k Ω Cext External Timing Capacitance 0 1000 µF Output Duty Cycle RT = 2.0 k Ω 50 % RT = MAX Rext 90 |
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