Hi all: In hardware design, we often encounter the problem of pullup or pulldown resistor, i very puzzled about it: 1.how to determine pullup or pulldown. 2.how to determine the value of pullup or pulldown resistor. These are two common hardware design problem. I hope can see some detailed materials about it. Help me! Regards! ------------------------------------------------------------------ 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