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AMPL138ZCE3 Datasheet(PDF) 122 Page - Texas Instruments |
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AMPL138ZCE3 Datasheet(HTML) 122 Page - Texas Instruments |
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122 / 268 page  6.11.3.10 VREF Routing A1 A1 DDR2/mDDRDevice VREFNominalMinimum TraceWidthis20Mils VREFBypassCapacitor NeckdowntominimuminBGA escape regionsisacceptable.Narrowingto accomodateviacongestionforshort distancesisalsoacceptable.Best performanceisobtainedifthewidth ofVREFismaximized. DDR2/mDDR OMAP-L138 Low-Power Applications Processor SPRS586A – JUNE 2009 – REVISED AUGUST 2009 www.ti.com VREF is used as a reference by the input buffers of the DDR2/mDDR memories as well as the OMAP-L138. VREF is intended to be half the DDR2/mDDR power supply voltage and should be created using a resistive divider as shown in Figure 6-18. Other methods of creating VREF are not recommended. Figure 6-22 shows the layout guidelines for VREF. Figure 6-22. VREF Routing and Topology Peripheral Information and Electrical Specifications 122 Submit Documentation Feedback |
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