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SN74LS244 | Non-Inverting Buffer/Driver | Buffer/Driver/Transceiver http://www.ti.com/product/SN74LS244 Download a datasheet or document on TIs SN74LS244 Buffer/Driver/Transceiver , from the Non-Inverting Buffer/Driver collection of analog and digital product 129公交

74hc244,74ls244引脚图应用电路与中文资料 http://www.51hei.com/chip/3975.html 74HC244 是CMOS电路,74ls244 是双极晶体管型电路,二者的特性差别很大,LS器件是淘汰型,尽量不要选用。 74HC240,74HC241,74HC244为同一系列的产品,他们的区别很