DM385, DM388
SPRS821D –MARCH 2013–REVISED DECEMBER 2013
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7.2.9.2 Digital
Recommended capacitors for power supply decoupling are all 0.1uF in the smallest body size that can be
used. Capacitors are more effective in the smallest physical size to limit lead inductance. For example,
0201 sized capacitors are better than 0402 sized capacitors, and so on. TI recommends using capacitors
no larger than 0402. Place at least one capacitor for every two power pins. For those power pins that have
only one pin, a capacitor is still required. Place one bulk (10 uF or larger) capacitor for every 10 or so
power pins as closely as possible to the chip. These larger caps do not need to be under the chip
footprint.
Pay special attention not to put so much capacitance on the supply that it slows the start-up voltage ramp
enough to change the power sequencing order. Also be sure to verify that the main chip reset is low until
after all supplies are at their correct voltage and stable.
DDR peripheral related supply capacitor numbers are provided in Section 8.13, DDR2/DDR3/DDR3L
Memory Controller.
136
Power, Reset, Clocking, and Interrupts
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