74HC Series ICs

74HC ICs are high-speed CMOS ICs that merge the low power consumption found in the 4000 series ICs with the better speed found in TTL IC�s. Basically, they are CMOS ICs with the same pin outs as the older 74LS series. The 74HCT series are a little different in that the 74HCT ICs can be mixed with the 74LS series ICs.