2线—4线译码器.ewb

通信原理-高频电子电路CAI-340页-22.2M-ppt版.zip

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"        译码是编码的逆过程，将输入的每个二进制代码赋予的含义“翻译”过来，给出相应的输出信号。在选通端ST（低电平有效）为0时，对应译码地址输入端A1、A0的每一组代码输入，都能译成在对应输出端输出高电平1。例如，当地址输入A1=1；A0=0时，则在其对应输出端Y2=1。合理地应用选通端ST，可以扩大其逻辑功能。例如，可以用两片2线—4线译码器构成3线—8线译码器。" 
"        2线—4线译码器真值表：（1——高电平，0——低电平，X——任意，低电平有效。）" 
"			ST	A1	A0	Y3	Y2	Y1	Y0" 
"			 1	 X	 X	 0	  0	  0	  0" 
"			 0	 0	 0	 0	  0	  0	  1" 
"			 0	 0	 1	 0	  0	  1	  0" 
"			 0	 1	 0	 0	  1	  0	  0" 
"	 		 0	 1	 1	 1	  0	  0	  0" 

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