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chips:74157 [2008/07/04 16:14]
chips:74157 [2019/08/27 20:45] (current)
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 +===== 74157 IC =====
 +
 +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 each. 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.
 +
 +{{chips:​74157.gif?​nocache }}
 +^ IC 1 ^^^^
 +^ Pin ^ Function ^ Function ^ Pin ^
 +|  1 | Select ​ |  Vcc | 16 |
 +|  2 | 1A  |  CE | 15 | 
 +|  3 | 1B  |  4A | 14 | 
 +|  4 | 1Y  |  4B | 13 | 
 +|  5 | 2A  |  4Y | 12 | 
 +|  6 | 2B  |  3A | 11 | 
 +|  7 | 2Y  |  3B | 10 | 
 +|  8 | Gnd  |  3Y | 9  | 
 +
 +==== Uses ====
 +  * [[controls:​megadrive_genesis_controller_3|Genesis/​MD 3-button controller]]
 +  * [[controls:​pc_engine_controller|PC Engine/​TurboGrafx 16 controller]]
 +  * [[http://​www.gamesx.com/​importmod/​sat_switchless.htm|Saturn switchless import mod]]
 +
  
 
 
 
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