[Coco] What do you use for pull-up and pull-down TTL resistor values? (LS series) (coco related project but possibly OT)

[Salvador Garcia]

 Hi Ed,

When I did my share of pulling up or down inputs, I pulled up or down depending on the TTL (for example, unused AND inputs got pulled up, unused OR or buffer inputs got pulled down); however, I never used a resistor when pulling down to gnd. Is this something that is important, given that you mention that it might not be good practice?

Thanks! Salvador



    On Monday, April 22, 2019, 2:33:15 PM EDT, Ed Snider <zippster278 at gmail.com> wrote:  
 
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It will always be safe to tie them high or low through a pulp/pulldown (within the chip voltage ratings).
Usually it can be tied to ground without a resistor, though that probably isn’t best practice.

I generally use 10K for the value, though the value here isn’t critical.

- Ed

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