On Nov 9, 2011, at 11:38 AM, YES NOPE9 wrote: http://www.nxp.com/products/logic/analog_switches/NX3P191.html Why is Rdch ( 280 ohms ) included ? Does it cause problems when paralleling these chips ? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .