7400 competition entry: Hex KeyPad

Posted on Monday, October 17th, 2011 in 7400 contest by Arup

Adam submitted his Open 7400 Logic competition entry, a 16 button keypad that outputs the hexadecimal value in a 4 bit binary equivalent.
Adam wrote

This is a handy device for prototyping, etc… It’s a hexadecimal keypad (0..9, A..F) that outputs the hexadecimal value on 4 digital binary lines (one nibble). It has both active high and active low output (so it’ll work for any system), as well as active high and active low strobe outputs for when the data is on the lines. I also added an on/off switch for convenience.

Via the forum.

This entry was posted on Monday, October 17th, 2011 at 8:00 pm and is filed under 7400 contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “7400 competition entry: Hex KeyPad”

  1. rsdio says:

    This one actually looks useful!

  2. jason says:

    Oh ya, I need a hex keypad like this :D

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