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Thread: IO selection

4 Discord messages from ℹ️ - Information/⁉️-questions/threads/io-selection.md.

Category: ℹ️ - Information Parent channel: #⁉️-questions Thread ID: 1439239793434427537

Messages: 4

message-1439239793434427537

2025-11-15T13:05:06.537+00:00 — tnt (@246tnt)

Content

Any reason to use the CMOS input buffer vs schmitt ?
Any reason to go for slow slew ?
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message-1439241201101443144

2025-11-15T13:10:42.151+00:00 — Leo Moser (mole99) (@mole99)

Content

Is this a general question or one related to the template?

- The schmitt buffer can be used for the clock to prevent false switching/glitches. But I'm not sure if it's absolutely necessary.
- Slow slew: for EMC reasons for example
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message-1439242642436133006

2025-11-15T13:16:25.792+00:00 — tnt (@246tnt)

Content

It was more in general but in the context of GF180.
Like I don't see any case where you wouldn't want a schmitt input for instance. AFAICT from the spec document, it's same delay, same input load, so  why not use it all the time ?
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message-1439243213822234675

2025-11-15T13:18:42.021+00:00 — Leo Moser (mole99) (@mole99)

Content

Good point. Perhaps because it does not switch at the mid-point, which could be a problem for some applications? Just guessing 🤷‍♂️

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