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TMS320DM647_0804 bảng dữ liệu(PDF) 101 Page - Texas Instruments

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6.9.3.6 Bulk Bypass Capacitors
TMS320DM647/TMS320DM648
Digital Media Processor
www.ti.com
SPRS372B – MAY 2007 – REVISED APRIL 2008
Bulk bypass capacitors are required for moderate speed bypassing of the DDR2 and other circuitry.
Table 6-32 contains the minimum numbers and capacitance required for the bulk bypass capacitors. This
table covers only the bypass needs of the DSP and DDR2 interfaces. Additional bulk bypass capacitance
may be needed for other circuitry.
Table 6-32. Bulk Bypass Capacitors
NO.
PARAMETER
MIN
MAX
UNIT
1
DVDD18 Bulk Bypass Capacitor Count
(1)
3
Devices
2
DVDD18 Bulk Bypass Total Capacitance
30
µF
3
DDR#1 Bulk Bypass Capacitor Count(1)
1
Devices
4
DDR#1 Bulk Bypass Total Capacitance
10
µF
5
DDR#2 Bulk Bypass Capacitor Count(1)(2)
1
Devices
6
DDR#2 Bulk Bypass Total Capacitance(2)
10
µF
(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 32-bit wide DDR2 memory systems
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Peripheral Information and Electrical Specifications
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