description: this document describes valueram's 32m x 72-bit (256mb), cas latency 2.5 sdram (synchronous dram) low-profile registered ddr266 ecc memory module. the compo- nents on this module include nine 32m x 8-bit (8m x 8-bit x 4 bank / 133mhz, 7.5ns, cl2.5 components) sdram in tsop packages and three 16-bit drivers in tssop packages. this 184-pin dimm uses gold contact fingers and requires +2.5v. the electrical and mechanical specifications are as follows: features: clock cycle time (tck) 7.5ns (min.) / 12ns (max.) row cycle time (t rc ) 65ns (min.) refresh row cycle time (trfc) 75ns (min.) row active time (tras) 45ns (min.) / 120,000ns (max.) single power supply of +2.5v (+/- .25v) power (idd0) 4.725 w (operating) ul rating 94 v - 0 part no. valueram0255-001.a00 08/21/02 figure 1: kvr266x72rc25l/256 184-pin ddr sdram module kvr266x72rc25l/256 256mb 32m x 72-bit ddr266 registered 184-pin ecc dimm note: the module defined in this data sheet is one of several configurations available under this part number. while all configurations are compatible, the dram combination and/or the module height may vary from what is described here. however, in no configuration will the module height exceed 1.2" (30.48mm).
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