Datasheet

AM3517, AM3505
www.ti.com SPRS550E –OCTOBER 2009–REVISED MARCH 2013
6.4.2.2.6 Bulk Bypass Capacitors
Bulk bypass capacitors are required for moderate speed bypassing of the DDR2 and other circuitry.
Table 6-26 contains the minimum numbers and capacitance required for the bulk bypass capacitors. Note
that this table only covers the bypass needs of the AM3517/05and DDR2 interfaces. Additional bulk
bypass capacitance may be needed for other circuitry.
Table 6-26. Bulk Bypass Capacitors
No. Parameter Min Max Unit Notes
1 VDDS Bulk Bypass Capacitor Count 3 Devices See Note
(1)
2 VDDS Bulk Bypass Total Capacitance 30 uF
3 DDR#1 Bulk Bypass Capacitor Count 1 Devices See Note
(1)
4 DDR#1 Bulk Bypass Total Capacitance 22 uF
5 DDR#2 Bulk Bypass Capacitor Count 1 Devices See Notes
(1)
,
(2)
6 DDR#2 Bulk Bypass Total Capacitance 22 uF See Note
(2)
(1) These devices should be placed near the device they are bypassing, but preference should be given to the placement of the high-speed
(HS) bypass caps.
(2) Only used on dual-memory systems
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