>-----Original Message----- >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] >Sent: 09 March 2006 12:32 >To: Microcontroller discussion list - Public. >Subject: Re: [EE] LVTTL Schmitt trigger non-inverting buffer - >do they existintiny packages? > > >On 3/9/06, Michael Rigby-Jones wrote: >> >> >> >-----Original Message----- >> >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] >> >Sent: 09 March 2006 05:32 >> >To: Microcontroller discussion list - Public. >> >Subject: Re: [EE] LVTTL Schmitt trigger non-inverting buffer - do >> >they existin tiny packages? >> > >> > >> >On 3/8/06, Michael Rigby-Jones >> >wrote: >> >> Help! >> >> >> >> Requirements: >> >> >> >> Supply voltage 3.3v >> >> Input thresholds LVTTL (0.8v/2.0v) >> >> Output thresholds CMOS (driving an AVR) >> >> Schmitt Trigger >> >> Smallest package possible e.g. Philips Pico-logic or TI's >> >> NanoStar/NanoFree die-with-solder-bumps style would be perfect. >> >> >> >> I've been scouring various manufacturers web sites and nothing I >> >> can see comes close, in particular I can't find a Schmitt trigger >> >> device with true LVTTL compliant inputs. Do they exist? >> > >> >http://focus.ti.com/docs/prod/folders/print/sn74auc1g17.html >> >> Thanks Vasile, but that's 2.7v maximum supply. I need to go up to >> 3.3v +5% > >You can't, you need a 2V input requirement and a 3.3V output >requirement. Use a 2V to 2.7V supply device with an open drain >up to 3.3V. I had this problem too and never found such a gate >(except the buffer level converter with many gates). No, I need guarantee LVTTL input thresholds which are 0.8v and 2.0v for the maximum Logic 0 threshold and the minimum Logic 1 threshold. The actual input voltage swing could be a maximum of 0-3.3 volts. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist