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EM48AM1644VTC-7FE Datasheet(PDF) 8 Page - Eorex Corporation |
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EM48AM1644VTC-7FE Datasheet(HTML) 8 Page - Eorex Corporation |
8 / 18 page eorex EM484M1644VTC Dec. 2007 www.eorex.com Note 5.2: AC characteristics assumed input rise and fall time (tr & tf) = 1ns. If tr & tf is longer than 1ns, transient time compensation should be considered, i.e., following compensation should be added to the parameter. For example: tIS : tr/2 (CLK rising edge )+ tT/2(tf for /cas/ras/we..start edge; tr or tf for address/data pin)-1ns tIH : tr/2 (CLK rising edge )+ tT/2(tr for /cas/ras/we..end edge; tr or tf for address/data pin)-1ns Note 5.3: tHZ defines the time at which the output achieve the open circuit condition and is not referenced to output voltage levels. AC Operating Test Characteristics (Continued) (VDD=3.3V±0.3V, TA=0°C ~70°C/TA=-25°C ~ +85°C for extended grade) -6 -7 Symbol Parameter Min. Max. Min. Max. Units tRC ACTIVE to ACTIVE Command Period (Note 6) 60 62 ns tRAS ACTIVE to PRECHARGE Command Period (Note 6) 40 100k 42 100k ns tRP PRECHARGE to ACTIVE Command Period (Note 6) 18 18 ns tRCD ACTIVE to READ/WRITE Delay Time (Note 6) 18 18 ns tRRD ACTIVE(one) to ACTIVE(another) Command (Note 6) 12 14 ns tCCD READ/WRITE Command to READ/WRITE Command 1 1 CLK tDPL Date-in to PRECHARGE Command 2 2 CLK tBDL Date-in to BURST Stop Command 1 1 CLK CL=3 3 3 tROH Data-out to High Impedance from PRECHARGE Command CL=2 2 CLK tREF Refresh Time (4,096 cycle) 64 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) 8/18 |
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