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HY5DU12422CLTP-X Datasheet(PDF) 16 Page - Hynix Semiconductor |
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HY5DU12422CLTP-X Datasheet(HTML) 16 Page - Hynix Semiconductor |
16 / 31 page Rev. 1.0 / Mar. 2005 16 1 HY5DU12422C(L)TP HY5DU12822C(L)TP HY5DU121622C(L)TP DLL RESET The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and upon return- ing to normal operation after having disabled the DLL for the purpose of debug or evaluation. The DLL is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit of self refresh operation. Any time the DLL is enabled, 200 clock cycles must occur to allow time for the internal clock to lock to the externally applied clock before an any command can be issued. OUTPUT DRIVER IMPEDANCE CONTROL The normal drive strength for all outputs is specified to be SSTL_2, Class II. Hynix also supports a half strength driver option, intended for lighter load and/or point-to-point environments. Selection of the half strength driver option will reduce the output drive strength by 50% of that of the full strength driver. I-V curves for both the full strength driver and the half strength driver are included in this document. |
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