[SI-LIST] SSTL termination resistor power

SSTL termination might use ODT termination for receiver side. 
 
The implementation is about 120ohm between PAD and VDDQ, another 120ohm between 
PAD and VSSQ. Overall AC impedance is about 60ohm.
Since signal is DC coupled, there is DC current burning in terminaion 
resistors. If the PCB trace impedance is 60ohm, then the DC current in the 
termination resistor is about 20mA. It is so huge that I can not believe that 
DDR memory can afford it.
 
Is there any way to reduce the power?
 
thanks,
Han
                
---------------------------------
 Start your day with Yahoo! - make it your home page 

------------------------------------------------------------------
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 FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

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

Other related posts: