Spehro Pefhany wrote:

> You could consider 3 74HC4053s. No isolation, but < 80 cents total.

These come really close.  10V Vcc-Vee is the absolute max, though, I'd
hate to push this.

Also, the ON resistance is fairly high (typical 70, max 160).  The
signal must drive a line that ultimate terminates in two diode drops to
ground, so a total of about 200 ohms needs to be used in series to drop
from 5V Vcc to 1.2V nominal at 20 ma.  The output FET would then be
about a third to two thirds of this--wouldn't this make for a lot of
spread in current values between parts?

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body