I am looking for the maximum allowed current value for clamp diodes in ATtiny. Either it's not stated explicitly in the datasheet or I'm not smart enough to find it. Some manufacturers state this value explicitly, some hide it under more cryptic "max in-rush current" or simply Iil max. Unfortunately this is not the case of Atmel. The only parameter resembling it is max. current through IO pin, specified at 40 mA. Not sure if this is the same as clamping diode max safe current.
BTW, it's 20 mA for Microchip PIC12 & PIC16 chips.
Any figure, definitive or experimental, will be appreciated.