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R1QNA4436RBG-33IA0 Datasheet(PDF) 10 Page - Renesas Technology Corp |
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R1QNA4436RBG-33IA0 Datasheet(HTML) 10 Page - Renesas Technology Corp |
10 / 30 page R1QNA4436RBG,R1QNA4418RBG Datasheet R10DS0148EJ0200 Rev.2.00 Page 10 of 29 Aug 01, 2014 Programmable Output Impedance 1. Output buffer impedance can be programmed by terminating the ZQ ball to VSS through a precision resistor (RQ). The value of RQ is five times the output impedance desired. The allowable range of RQ to guarantee impedance matching with a tolerance of 15% is between 175 Ω and 350 Ω. The total external capacitance of ZQ ball must be less than 7.5 pF. QVLD (Valid data indicator) 1. QVLD is provided on the QDR-II+ and DDR-II+ to simplify data capture on high speed systems. The Q Valid indicates valid output data. QVLD is activated half cycle before the read data for the receiver to be ready for capturing the data. QVLD is inactivated half cycle before the read finish for the receiver to stop capturing the data. QVLD is edge aligned with CQ and /CQ. |
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