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EM488M1644VTD-7F Datasheet(PDF) 5 Page - Eorex Corporation |
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EM488M1644VTD-7F Datasheet(HTML) 5 Page - Eorex Corporation |
5 / 18 page EM488M1644VTD ____________________________________________ Operating AC Characteristics ( VDD = 3.3V +/- 0.3 V, Ta = 0 ~ 70 °C) Parameter Symbol -7 -7.5 Min. Max. Min. Max. Units Notes Clock cycle time CL = 3 CL = 2 tCK 7 7.5 ns 7.5 10 ns Access time from CLK CL = 3 CL = 2 tAC 5.4 5.4 ns 5.4 6 ns CLK high level width tCH 2.5 2.5 ns CLK low level width tCL 2.5 2.5 ns Data-out hold time CL = 3 CL = 2 tOH 3 3 ns ns Data-out high impedance time CL = 3 CL = 2 tHZ 3 7 3 7 ns ns Data-out low impedance time tLZ 0 0 ns Input hold time tIH 1 1 ns Input setup time tIS 1.5 1.5 ns ACTIVE to ACTIVE command period tRC 62 67 ns 2 ACTIVE to PRECHARGE command period tRAS 42 100k 45 100k ns 2 PRECHARGE to ACTIVE command period tRP 3 3 CLK 2 ACTIVE to READ/WRITE delay time tRCD 3 3 CLK 2 ACTIVE(one) to ACTIVE(another) command tRRD 2 2 CLK 2 READ/WRITE command to READ/WRITE command tCCD 1 1 CLK Data-in to PRECHARGE command tDPL 2 2 CLK Data-in to BURST stop command tBDL 1 1 CLK Data-out to high impedance from PRECHARGE command CL = 3 CL = 2 tROH 3 3 CLK 2 2 CLK Refresh time(4,096 cycle) tEF 64 64 ms * All voltages referenced to Vss. Note : 1. tHZ defines the time at which the output achieve the open circuit condition and is not referenced to output voltage levels. 2. 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) 5 |
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