将多片74LS138单片集成3线-8线译码器级联构成不同的译码器，能够灵活、有效地扩大译码器的使用范围。不同的74LS138进行级联时，任何时候只允许一个译码器工作，译码器的工作状态由其选通控制端决定。%Integrate many 3-8line decoders composed of single 74LS138 chip with cascade to be different decoders , which can expand the usage of decoders effectively .In the cascade of different 74LS138 chips ,only one decoder is allowed to work anytime .The working state of decoder is determined by its pass control terminal .
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