The TPIC6B595 doesn't appear to have 3.3V tolerant inputs, which is what is needed for this application. VIh(min) for any of the TPIC6x595 family is 0.85 x Vcc (5V in this circuit), and the PIC is running at 3.3V. RR ----- Original Message ----- From: To: "Microcontroller discussion list - Public." Sent: Saturday, January 26, 2008 12:08 PM Subject: Re: [EE]: 3.3V-friendly TPIC6C595 > Try TPIC6B595N and kin > > David > > Quoting Rob Robson : > >> Thanks, Bob. If it can drive small relays, it sounds exactly like what >> I'm >> looking for. Unfortunately, I come up empty-handed when I search on that >> (partial?) part number on the TI site or Digi-Key's. I can't find it by >> doing a parametric search on TI's site either. Are you sure about the >> part >> number? >> >> Best regards, >> RR >> >> >> ----- Original Message ----- >> From: "Bob Axtell" >> To: "Microcontroller discussion list - Public." >> Sent: Saturday, January 26, 2008 4:32 AM >> Subject: Re: [EE]: 3.3V-friendly TPIC6C595 >> >> >> > Rob Robson wrote: >> >> I'm looking for an equivalent to the venerable TPIC6C595 shift >> >> register/driver that could be driven by a micro running from 3.3V >> >> without >> >> having to add a level converter. Has anyone used or found such an >> >> animal? >> >> >> >> TIA, >> >> RR >> >> >> >> >> >> >> > why not use the TLV595? It works at 3.3V admirably. Texas Instruments >> > makes them. I would avoid >> > Fairchild's version, too sensitive to noise for my blessing. >> > >> > The device also buffers the signal well enough to drive external loads >> > easily... >> > >> > >> > --Bob A >> > -- >> > http://www.piclist.com PIC/SX FAQ & list archive >> > View/change your membership options at >> > http://mailman.mit.edu/mailman/listinfo/piclist >> > >> >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist