Joined: Sep 26, 2016 Posts: 113 Location: norwich, uk
Posted: Wed Apr 04, 2018 4:19 am Post subject:
latching logic puzzle
I need a 2 input, 1 output gate that does the following:
Output is low unless both inputs are high (like '&')
but stays high until BOTH inputs go low.
Some sort of flip flop or latch thing I recon but I havent as yet come across one that does the job.
(I feel like im constantly writing little questions here to try and solve my lunetta problems, feel free to politely ask me not to if it is annoying!) Last edited by mike page on Fri Apr 06, 2018 12:19 am; edited 2 times in total
Joined: Jan 14, 2010 Posts: 4051 Location: Moon Base
Audio files: 595
Posted: Thu Apr 05, 2018 2:29 am Post subject:
yes, when one of the inputs goes low it is the equivalent of a piece of wire attached to itself. A small capacitor could work
but it wil be discharged by whatever you attach the output too so it needs to be big enough but also small enough to handle
the frequency. I think the 4051 is just a better options and because both halves of the 4052 share the control inputs
it's probably not that useful anyway.
Just saw this thread and I would do it just like Blue Hell and SteveG said. It can be done with just one quad NAND IC (4011 or 4093) if you use one NAND to set and the wired-OR to reset the RS-FF from two NANDs.
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