Romeo, The JEDEC HSTL standard (EIA/JESD8-6) do not state a strict requirement = of a Vddq, its optional. Read the first paragragh in the standard, i.e. = 1 Scope. The way I interpret the standard is that the strict requirement is: Voh(DC)max <=3D 1.6 V (VDDQmax) Voh(DC)min >=3D 1.0 V (VDDQmin-0.4V). This can be obtained with or without a VDDQ Regards /Henrik G Madsen -----Original Message----- From: Romeo Iacobut [mailto:romeo@xxxxxxxxxxx] Sent: 22. maj 2003 17:36 To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] HSTL standard question, Hello, Sorry for the slightly off-topic post, but I have not any place to ask this. In JEDEC standard for HSTL , there are speciefied the supply voltage levels: Vdd(Device supply voltage), Vddq(output supply voltage), and Vref(input reference voltage). My concerns are regarding to Vdd and Vddq.=20 If I have a 3.3V CMOS technology, how I will deal with Vddq(which is fixed at 1.5V)? Output supply voltages is reffering at the last stage of the buffer? For that I need a different supply (1.5V)?=20 Thank you in advance for any inputs/suggestions and patience. Regards, ROmeo ------------------------------------------------------------------ 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: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages=20 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ 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: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //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