常用三态门逻辑符号

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1、三态门逻辑符号如下：             EN＝1，               ＝0，EN＝0，Y为高阻状态             ＝1，Y为高阻状态常用逻辑门电路符号：                                     与门                        与非门                    非门（反相器）                                                                                                 或门    

2、            或非门                     与或非门                                                                               Y=                                                      OC与非门                                    三态与非门                    （外接集电极电C=1，                                 

3、  ＝0，阻后）                  C=0，高阻                      ＝1，高阻                    C=1，Y=A                                 ＝0，Y=AC=0，Y高阻                               ＝1，Y高阻                            C=1，                                    ＝0，C=0，Y高阻