Post by thread:[EE] 3.3v-5v level shifter/transceiver in DIP pac

>I'm looking for a level-shifter (3.3v-5v), preferably a transceiver, that I >could use to interface between a PIC and a MMC card. Since I'm prototyping >on a breadboard though, it must be a DIP --- I looked around, but couldn't >find any that were. Any ideas on where to look? I think you're out of luck wanting DIP. My current project uses SN74LVC4245A octal transceivers to do this and they only seem to come as SM devices. Mind you it wouldn't be hard to make a 24 TSSOP/SSOP/SOIC to DIP adaptor. Check out TI for free samples and also take a look at the SN74LVC3245 parts, they are functionally the same as the 4245 but the control signals operate at the 3.3v level instead of 5v. Regards Jean-Michel. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

How about operating the PIC on 3.3 volts as well? Regards, Anand Dhuru ----- Original Message ----- From: "Ishaan Dalal" <.....izxKILLspam@spam@XIZX.NET> To: <PICLISTKILLspamMITVMA.MIT.EDU> Sent: Saturday, July 19, 2003 6:45 PM Subject: [EE] 3.3v-5v level shifter/transceiver in DIP packaging? {Quote hidden}> I'm looking for a level-shifter (3.3v-5v), preferably a transceiver, that I > could use to interface between a PIC and a MMC card. Since I'm prototyping > on a breadboard though, it must be a DIP --- I looked around, but couldn't > find any that were. Any ideas on where to look? > > Thanks, > Ishaan > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> How about operating the PIC on 3.3 volts as well? Can't; PIC is emulating a DDS at 39.0625 KHz (40 Mhz/4/256), and the 18LFs do 40 MHz at 4.2V, but go down from then. Anyway, I found the SN74LVC245AN (PDIP) from TI, that handles over-voltage I/O at Vcc=3.3V, so I should be all set... :-) Cheers, Ishaan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

How many interface lines do you need? Can't you use simple transistor switches for this? And you should be able to get transistor arrays in DIP packaging. Cheers, -Neil. On Saturday 19 July 2003 10:23, Anand Dhuru scribbled: > How about operating the PIC on 3.3 volts as well? > > Regards, > > Anand Dhuru > > > {Original Message removed}

> How many interface lines do you need? Can't you use simple transistor > switches for this? And you should be able to get transistor arrays in DIP > packaging. Five. Since none need to be bidirectional, I imagine I could use a transistor array. I could also just use a '244 buffer instead of the '245 transceiver I thought of earlier. Let's see... Cheers, Ishaan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

I'm doing an MMC right now. I've decided on using an 74LVX244. Its available in DIP, too. It can tolerate 5V inputs for a 3.3V output. The 3.3V regulator only drives the 74LVX244. I parallelled 4 unused outputs to drive the MMC card and its pullups. --Bob At 09:15 AM 7/19/2003 -0400, you wrote: {Quote hidden}>I'm looking for a level-shifter (3.3v-5v), preferably a transceiver, that I >could use to interface between a PIC and a MMC card. Since I'm prototyping >on a breadboard though, it must be a DIP --- I looked around, but couldn't >find any that were. Any ideas on where to look? > >Thanks, >Ishaan > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body --------------- NOTICE 1. This account can accept email & attachments up to 10M in size. 2. Federal Monitors: At request of client, some attachments are encrypted. Please DO NOT delay traffic; please reply with credentials for password. -------------- -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> I'm doing an MMC right now. SPI, or the MMC protocol? > I've decided on using an 74LVX244. Its available in DIP, too. Which manufacturer? Couldn't find a DIP variant in either the Fairchild or ST LVX244 lineups. I'll probably stick to TI's 74LV244AN. Cheers, Ishaan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body

SPI. I'm not moving data fast, cheap is what I need. You might be right about the LVX244, only SM. --Bob At 04:49 PM 7/19/2003 -0400, you wrote: {Quote hidden}> > I'm doing an MMC right now. > >SPI, or the MMC protocol? > > > I've decided on using an 74LVX244. Its available in DIP, too. > >Which manufacturer? Couldn't find a DIP variant in either the Fairchild or >ST LVX244 lineups. I'll probably stick to TI's 74LV244AN. > >Cheers, >Ishaan > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email TakeThisOuTlistservEraseMEspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body --------------- NOTICE 1. This account can accept email & attachments up to 10M in size. 2. Federal Monitors: At request of client, some attachments are encrypted. Please DO NOT delay traffic; please reply with credentials for password. -------------- -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body