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chips:74157 [2005/11/15 21:26] – created nfgchips:74157 [2005/11/15 21:45] – nfg
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 The 74157 is a quad 2-line to 1-line multiplexer. Basically how this works is there are two inputs ( A and B ) for every output ( Y ). There are four groups like this, with two inputs and one output. There is one select signal for the whole chip. When the select signal is low, the output ( Y ) is the same as input A. When the select signal is high, the output Y is the same as input B. The 74157 is a quad 2-line to 1-line multiplexer. Basically how this works is there are two inputs ( A and B ) for every output ( Y ). There are four groups like this, with two inputs and one output. There is one select signal for the whole chip. When the select signal is low, the output ( Y ) is the same as input A. When the select signal is high, the output Y is the same as input B.
 +
 +**Note:** The buttons below correspond to SNES buttons.  They should be replaced with weak/med/hard Punch + Kick references.
  
 {{ chips:ic-74157.png}} {{ chips:ic-74157.png}}
 +^ IC 1 ^^^^
 ^ Pin ^ Function ^ Function ^ Pin ^ ^ Pin ^ Function ^ Function ^ Pin ^
-|   1 |  Select  |  Vcc (+5v)  | 16  | +|   1 |  DB9-8  |  DB9-5  | 16  | 
-|   2 |  1A  |  Enable (GND)  | 15  | +|   2 |  Right  |  GND  | 15  | 
-|   3 |  1B  |  4A  | 14  | +|   3 |  Select  |  R Button  | 14  | 
-|   4 |  1Y  |  4B  | 13  | +|   4 |  DB9-4  |  Up  | 13  | 
-|   5 |  2A  |  4Y  | 12  | +|   5 |  Left  |  DB9-1  | 12  | 
-|   6 |  2B  |  3A  | 11  | +|   6 |  X button  |  Down  | 11  | 
-|   7 |  2Y  |  3B  | 10  | +|   7 |  DB9-3  |  Y Button | 10  | 
-|   8 |  GND  |  3Y  | 9  | +|   8 |  GND  |  DB9-2  | 9  |  
 + 
 +** UNFINISHED! **
chips/74157.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1