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EM481M3244LBA-8FE Datasheet(PDF) 8 Page - Eorex Corporation |
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EM481M3244LBA-8FE Datasheet(HTML) 8 Page - Eorex Corporation |
8 / 19 page eorex EM488M3244LBA Jul. 2006 www.eorex.com AC Operating Test Characteristics (Continued) (VDD=1.8V±0.1V, TA=0°C ~70°C) -75 Symbol Parameter Min. Max. Units tRC ACTIVE to ACTIVE Command Period (Note 6) 67.5 ns tRAS ACTIVE to PRECHARGE Command Period (Note 6) 45 120k ns tRP PRECHARGE to ACTIVE Command Period (Note 6) 22.5 ns tRCD ACTIVE to READ/WRITE Delay Time (Note 6) 22.5 ns tRRD ACTIVE(one) to ACTIVE(another) Command (Note 6) 15 ns tCCD READ/WRITE Command to READ/WRITE Command 1 CLK tDPL Date-in to PRECHARGE Command 2 CLK tBDL Date-in to BURST Stop Command 1 CLK CL=3 3 tROH Data-out to High Impedance from PRECHARGE Command CL=2 2 CLK tREF Refresh Time (4,096 cycle) 64 ms * All voltages referenced to VSS. Note 6: These parameters account for the number of clock cycles and depend on the operating frequency of the clock, as follows: The number of clock cycles = Specified value of timing/clock period (Count Fractions as a whole number) Recommended Power On and Initialization The following power on and initialization sequence guarantees the device is preconditioned to each user’s specific needs. (Like a conventional DRAM) During power on, all VDD and VDDQ pins must be built up simultaneously to the specified voltage when the input signals are held in the “NOP” state. The power on voltage must not exceed VDD+0.3V on any of the input pins or VDD supplies. (CLK signal started at same time) After power on, an initial pause of 200 µs is required followed by a precharge of all banks using the precharge command. To prevent data contention on the DQ bus during power on, it is required that the DQM and CKE pins be held high during the initial pause period. Once all banks have been precharged, the Mode Register Set Command must be issued to initialize the Mode Register. A minimum of eight Auto Refresh cycles (CBR) are also required, and these may be done before or after programming the Mode Register. 8/19 |
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