AN2586 Freescale Semiconductor / Motorola, AN2586 Datasheet - Page 14

• Manufacturer Part Number: AN2586
• Description: MPC8260 PowerQUICC II Family Power Distribution Trends
• Manufacturer: Freescale Semiconductor / Motorola

Previous Work Study
Previous Work Study
A fair distribution of power and ground around the chip creates a sort of symmetry in terms of current paths.
Note how most of the ground pins are placed inside the rim of the package. This consideration is important
because in the board layout it is easy to extend routes from these pins towards the center of the chip direction
and then to vias to the ground plan, for example. This arrangement makes it easy also for the layout engineer
to do the bypass coupling pads directly under the chip in the other side of the board, thus locating the
capacitors in a very close vicinity to the chip.
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Dark blue circles are the ground for I/O and Core.
Red circles are the Core power input.
Yellow circles are the I/O power input.
Green circles are the PLL power input.
Light blue circles are for the PLL ground pin.
MPC8260 PowerQUICC II Family Power Distribution Trends: A Survey
Freescale Semiconductor, Inc.
Figure 11. MPC8260 Power and Ground Pins
For More Information On This Product,
Go to: www.freescale.com
chip
MOTOROLA