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 ONSEMI
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6 page 
SN74LS221 http://onsemi.com 6 AC WAVEFORMS B INPUT CLEAR Q OUTPUT Q OUTPUT A INPUT IS LOW. B INPUT CLEAR Q OUTPUT A INPUT IS LOW. B INPUT CLEAR Q OUTPUT A INPUT IS LOW. tW(in) ≥60 ns tPLH tPHL tPLH tPHL 1.3 V 3 V 0 V 3 V 0 V VOH VOL VOH VOL ≥60 ns 1.3 V 1.3 V 3 V 0 V 3 V 0 V VOH VOL ≥ 50 ns ≥ 0 ts 3 V 0 V 3 V 0 V VOH VOL 3 V 0 V 3 V 0 V VOH VOL TRIGGERED NOT TRIGGERED ≥50 ns ≥50 ns B INPUT CLEAR Q OUTPUT A INPUT IS LOW. tW(out) TRIGGER FROM B, THEN CLEAR — CONDITION 1 TRIGGER FROM B, THEN CLEAR — CONDITION 2 CLEAR OVERRIDING B, THEN TRIGGER FROM B TRIGGERING FROM POSITIVE TRANSITION OF CLEAR Figure 1. |
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