DM385 datasheet(136/281 Pages) TI

136 / 281 page

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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DM385 数据表(PDF) 136 Page - Texas Instruments