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• VDD, VDDQ = 2.3V min ~ 2.7V max (Typical 2.5V Operation +/- 0.2V for DDR266, 333) VDD, VDDQ = 2.4V min ~ 2.7V max (Typical 2.6V Operation +0.1/- 0.2V for DDR400 and 400Mbps/pin product) All inputs and outputs are compatible with SSTL_2 interface Fully differential clock inputs (CK, /CK) operatio.