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74LS645 Datasheet(PDF) 4 Page - ON Semiconductor |
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74LS645 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 8 page SN74LS640 SN74LS641 SN74LS642 SN74LS645 http://onsemi.com 4 SN74LS641 • SN74LS642 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 0.6 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage – 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA IOH Output HIGH Current 100 µA VCC = MIN, VOH = MAX VO Output LOW Voltage 0.25 0.4 V IOL = 12 mA VCC = VCC MIN, VIN =VIL or VIH VOL Output LOW Voltage 0.35 0.5 V IOL = 24 mA VIN = VIL or VIH per Truth Table I Input HIGH Current 20 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH Current –0.1 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current – 0.4 mA VCC = MAX, VIN = 0.4 V I Power Supply Current Total, Output HIGH 70 A V MAX ICC Total, Output LOW 90 mA VCC = MAX Total at HIGH Z 95 AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits LS641 LS642 Symbol Parameter Min Typ Max Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay, A to B 17 16 25 25 19 14 25 25 ns tPLH tPHL Propagation Delay, B to A 17 16 25 25 19 14 25 25 ns CL = 45 pF, tPLH tPHL Propagation Delay, G, DIR to A 23 34 40 50 26 43 40 60 ns L RL = 667 Ω tPLH tPHL Propagation Delay, G, DIR to B 25 37 40 50 28 39 40 60 ns |
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