AVR-Chat

Hello, Leon.

You wrote:

>  With CMOS devices, it is possible in some situations for the substrate to
>  become biased so that the device behaves like an SCR, think of a 
>  forward-biased diode. Lots of current is drawn and the device can 
>  self-destruct. If power is removed quickly, they often recover.

>  It can be caused by applying a voltage to an I/O pin before the chip is
>  supplied with power, and there are several other causes:

> http://www.analog.com/library/analogDialogue/archives/35-05/latchup/

Very interesting effect. How it can be overcomed?


-- 

  Valerij Avrealij