On Mon, 2 May 2005, KY1K wrote: > Date: Mon, 02 May 2005 18:15:38 -0400 > From: KY1K > Reply-To: Microcontroller discussion list - Public. > To: Microcontroller discussion list - Public. > Subject: Re: [OT] Micropower vco needed > > The 74HC4046 requires way to much power, but thanks for the suggestion. > > It varies with vendor, but the lowest quiescent current I found was 80 ua, > and that's WITHOUT the VCO running! I said 74C4046 or CMOS4046, not HC. Quiescent should be 5-10nA w/o osc running (CD4046B 5V 20C). Another chip that was designed with low power oscillation in mind was the 4047. CD4046 needs 70uW at 10kHz (14uA @ 5V) and it runs down to 3V. The 4047 can run on 20uW (4uA) at 5V and 1kHz. If you reduce the supply to 3V you can get them 50% lower probably. Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist