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| SN74LS221 |
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 ONSEMI
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5 page 
SN74LS221 http://onsemi.com 5 AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C) From To Limits Symbol From (Input) To (Output) Min Typ Max Unit Test Conditions t A Q 45 70 ns tPLH B Q 35 55 ns t A Q 50 80 ns C =80 pFR =20 Ω tPHL B Q 40 65 ns Cext = 80 pF, Rext = 2.0 Ω tPHL Clear Q 35 55 ns CL = 15 pF, tPLH Clear Q 44 65 ns L See Figure 1 70 120 150 Cext = 80 pF, Rext = 2.0 Ω t () AorB QorQ 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) Limits Symbol Parameter Min Typ Max Unit Rate of Rise or Fall of Input Pulse dv/dt Schmitt, B 1.0 V/s Logic Input, A 1.0 V/ µs Input Pulse Width tW A or B, tW(in) 40 ns W Clear, tW (clear) 40 ts Clear-Inactive-State Setup Time 15 ns Rext External Timing Resistance 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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