[sdiy] Question about tri-state buffers and encoders

Jay Schwichtenberg jschwich53 at comcast.net
Mon Sep 11 21:55:45 CEST 2023

As mentioned tri-state is typically used for buses. You don't want to 
use pull-downs on those. You use pull-ups to keep the bus from floating. 
If you use pull-downs you're fighting the resistors when the signals go 
high. If you use a high resistance with pull-downs with CMOS it will 
probably work. If you use a lower resistance then you may not be able to 
pull the signal high when needed.

Jay S.

On 9/10/2023 12:47 PM, David G Dixon via Synth-diy wrote:
> My second question is, even though the circuit works with just the 
> unconnected encoder inputs grounded, should I install pull-down 
> resistors to ground onto all of the buffer outputs anyway, just to be 
> safe?
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