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GS8662R18E-300I Datasheet(PDF) 8 Page - GSI Technology |
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GS8662R18E-300I Datasheet(HTML) 8 Page - GSI Technology |
8 / 37 page Preliminary GS8662R08/09/18/36E-333/300/250/200/167 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.01 9/2005 8/37 © 2005, GSI Technology Power-Up Sequence for SigmaQuad-II SRAMs SigmaQuad-II SRAMs must be powered-up in a specific sequence in order to avoid undefined operations. Power-Up Sequence 1. Power-up and maintain Doff at low state. 1a. Apply VDD. 1b. Apply VDDQ. 1c. Apply VREF (may also be applied at the same time as VDDQ). 2. After power is achieved and clocks (K, K, C, C) are stablized, change Doff to high. 3. An additional 1024 clock cycles are required to lock the DLL after it has been enabled. Note: If you want to tie Doff high with an unstable clock, you must stop the clock for a minimum of 30 seconds to reset the DLL after the clocks become stablized. DLL Constraints • The DLL synchronizes to either K or C clock. These clocks should have low phase jitter (tKCVar on page 20). • The DLL cannot operate at a frequency lower than 119 MHz. • If the incoming clock is not stablized when DLL is enabled, the DLL may lock on the wrong frequency and cause undefined errors or failures during the initial stage. Power-Up Sequence (Doff controlled) Power UP Interval Unstable Clocking Interval DLL Locking Interval (1024 Cycles) Normal Operation K K VDD VDDQ VREF Doff Power-Up Sequence (Doff tied High) Power UP Interval Unstable Clocking Interval Stop Clock Interval DLL Locking Interval (1024 Cycles) Normal Operation K K VDD VDDQ VREF Doff 30ns Min Note: If the frequency is changed, DLL reset is required. After reset, a minimum of 1024 cycles is required for DLL lock. |
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