介绍74、74HC、74LS系列的芯片资料，要用的时候可能有一定的帮助

January 1988 MM54HC00/MM74HC00 Quad 2-Input NAND Gate General Descr iption These NAND gates utilize advanced silicon-gate CMOS technology to achieve operating speeds similar to LS-TTL gates with the low power consumption of standard CMOS