[SI-LIST] Re: CPLD getting blown on board

  • From: Sen Velmurugan <sen.velmurugan@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Sat, 08 Jun 2013 16:28:28 -0700

In addition...
Manufacturing Issues...
0ohm pull up resistor/s ?

Design Mistakes...
0ohm 3.3V pullup on 2.5V I/O ?
Check for floating inputs. Need to have internal PU enabled.
2.5V I/O driven by 3.3V.

PowerSupply Issue
Current flow on 2.5V and 3.3V rail during power up and power down in(+) 
& out(-) of CPLD or board.
Power up Overshoot on rails.
Sen.
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