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Figure 10-23. High-Frequency Capacitor Values and Layout
10.2
Bulk Decoupling Capacitance
Bulk, or low-frequency decoupling is needed on the
separate power plane "island", it is necessary to place capacitance on the processor "island." For
bulk decoupling, place two 47 mF surface mount capacitors in parallel, directly between the power
and ground planes. Place the capacitors close to the processor, within the power "island". If other
3.3V components are on the PCB, then the two 47 mF capacitors may be omitted since the other
components would have bulk decoupling capacitors. However, the value and number of capacitors
required is dependent on the individual board design and layout characteristics.
Design Guide
Intel® i960® RM/RN I/O Processor
Processor Power Supply Decoupling
*
Legend:
µ
= 0.1
RM/RN I/O
processor. If the processor is on a
F Capacitor
41
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