Li, If the DDR drivers drive a high percentage of 1's, there's every likelihood that the regulator output will cut off unless it is capable of sinking the required current. The 1.25 volt level will rise to some out-of-spec value. It's really not a good idea. Mike - - - - - Han Li wrote: >Hello, experts, > 1.25V DDR termination power Vtt should both sink and source >current. I wondered what happened if such a power cannot sink current? What >effects would this on DDR chip and on Power-Manangment IC? Could anyone >kindly provide some advices, research papers or reports on this? >Thank you very much. > > > > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: http://www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu