On Tuesday 05 February 2013 09:15:29 Ralph Stirling did opine: Message additions Copyright Tuesday 05 February 2013 by Gene Heskett
> Digikey.com . You also might consider 74HC595, 74HC497, or > 74AHC595 and 74AHC597. > > -- Ralph Probably a pretty good pair of subs, primarily because they can generally be loaded slightly heavier than the ls versions, AND will, generally speaking, have a much wider noise threshold than the ls versions. The HC family stuffs pull rail to rail whereas the ls has a logic zero output that is often above .3 volts, and only pulls to about 3.2 volts for logic 1's. Not a lot of change I hear some say, but the differences in the noise margins can make or break things in a room full of pwm servo motors and current regulated by chopper stepper drives. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Was my SOY LOAF left out in th'RAIN? It tastes REAL GOOD!! I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
