JAJSQ97J may 2009 – january 2021 XIO2001
PRODUCTION DATA
To support VAUX system requirements, the XIO2001 internally combines main power with VAUX power. There are three combined power rails in the XIO2001. These three power rails are distributed to the analog circuits, digital logic, and I/O cells that must operate during the VAUX state. Each of the three power rails has an output terminal for the external attachment of bypass capacitors to minimize circuit switching noise. These terminals are named VDD_15_COMB, VDD_33_COMB, and VDD_33_COMBIO.
The recommended bypass capacitors for each combined output terminal are 1000 pF, 0.01 μF, and 1.0 μF. When placing these capacitors on the bottom side of the circuit board, the smallest capacitor is positioned next to the via associated with the combined output terminal and the largest capacitor is the most distant from the via. The circuit board trace width connecting the combined output terminal via to the capacitors must be at least 12 to 15 mils wide with the trace length as short as possible.
Other than the three recommended capacitors, no external components or devices may be attached to these combined output terminals.