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AM1808AZCED3 데이터시트(PDF) 116 Page - Texas Instruments

부품명 AM1808AZCED3
상세설명  AM1808 ARM Microprocessor
PDF  264 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

AM1808AZCED3 데이터시트(HTML) 116 Page - Texas Instruments

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A1
A1
DDR2/mDDRDevice
VREFNominalMinimum
TraceWidthis20Mils
VREFBypassCapacitor
NeckdowntominimuminBGA escape
regionsisacceptable.Narrowingto
accomodateviacongestionforshort
distancesisalsoacceptable.Best
performanceisobtainedifthewidth
ofVREFismaximized.
DDR2/mDDR
AM1808
SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
www.ti.com
6.11.3.10 VREF Routing
VREF is used as a reference by the input buffers of the DDR2/mDDR memories as well as the device.
VREF is intended to be half the DDR2/mDDR power supply voltage and should be created using a
resistive divider as shown in Figure 6-16. Other methods of creating VREF are not recommended.
Figure 6-20 shows the layout guidelines for VREF.
Figure 6-20. VREF Routing and Topology
116
Peripheral Information and Electrical Specifications
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