LS74A TTL D "1" Q Q D Q 54 4.5 5 5.5 74 4.75 5 5.25 IOL fCK 0 tW 25 tsu th TA VIL VCD VOH IOH 54 4 74 8 20 ns -55 125 74 0 70 54 2.5 3.4 74 2.7 3.4 0.25 0.4 74 0.35 0.5 V VCC = II =-18mA VCC = VI = VIH =2.0V IOL=4mA V ICC fmax D 0.1 0.2 D 20 40 tPLH Q Q D -0.4 -0.8 -15 A mA VCC = VIL = IOL=8mA mA IOH =-400A VIH =2.0V VCC = VI =7.0V VCC = VI =2.7V VCC = VI =0.4V -100 mA VCC = VO =0V 8 mA VCC = VCK =0V 4 25 V V 5474 IOS V -1.5 MHz ns 54 0.8 IIL mA 5 74 A ns 25 0.7 IIH V 25 54 -400 2 II tPHL VIH VOL VCC 33 MHz 13 25 25 40 ICCQ Q ns VCC =5.0V CL=15pF RL=2k