Wondering if anybody has any experience with this -
I'm planning to use an ATtiny88 to directly drive 20 ssr's, one ssr per each of 20 i/o ports.
The ssr requires 8ma to turn it on, so the tiny88 ports have no problem individually.
Concern is that turning all ssr's 'on' at once will be a 160ma draw collectively thru the i/o ports.
The tiny88's spec says 'tbd' for a sum, so I looked at the tiny861, and it says >60ma (sink or source) is a problem (as a sum from all ports) because Voh will rise as you source >60ma, and Vol will rise as you sink >60ma.
I think it's actually a typo as I would expect Voh to fall as you source more current, but nonetheless, asking the forum if anybody has experience with this (ie, how much will the output voltage vary with greater collective loads on the i/o lines).
I could add buffer drivers between the i/o ports and the ssr's, but would like to avoid cost / connections.