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ZHCS488K October 2011 – December 2018 AM3351 , AM3352 , AM3354 , AM3356 , AM3357 , AM3358 , AM3359

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ZCZ|324

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7.7.2.3.3.6 Bulk Bypass Capacitors

Bulk bypass capacitors are required for moderate speed bypassing of the DDR3 and other circuitry. Table 7-64 contains the minimum numbers and capacitance required for the bulk bypass capacitors. Note that this table only covers the bypass needs of the AM335x DDR3 interface and DDR3 devices. Additional bulk bypass capacitance may be needed for other circuitry.

Table 7-64 Bulk Bypass Capacitors⁽¹⁾

NO.	PARAMETER	MIN	UNIT
1	AM335x VDDS_DDR bulk bypass capacitor count	2	devices
2	AM335x VDDS_DDR bulk bypass total capacitance	20	μF
3	DDR3 number 1 bulk bypass capacitor count	2	devices
4	DDR3 number 1 bulk bypass total capacitance	20	μF
5	DDR3 number 2 bulk bypass capacitor count⁽²⁾	2	devices
6	DDR3 number 2 bulk bypass total capacitance⁽²⁾	20	μF

These devices should be placed near the devices they are bypassing, but preference should be given to the placement of the high-speed (HS) bypass capacitors and DDR3 signal routing.
Only used when two DDR3 devices are used.