On Sun, 26 Nov 2006 09:57:13 -0600, "Yuriy K." <yktech@mail.ru> wrote:>Jim Thompson wrote: > >> For 3.3V to 5V Logic... >> >> http://analog-innovations.com/SED/LogicLevelTranslator74HC14-RevA.pdf > >Incredible. Designing complicated circuit instead of simply using >74HCT14 / 74HCT04 / zillion other HCT74xx and AHCTxx ICs.You've just proved yourself an incredible dumb-shit ;-) You have NO clue what "HCT" actually means. It DOES NOT MEAN that a +3.3V CMOS input is satisfactory. There ARE, however, specialty chips made for 3.3V <> 5V logic translators. Sheeesh! Another employment candidate for Fry's ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
3.3v <> 5v interfacing @ 15Mhz
Started by ●November 25, 2006
Reply by ●November 26, 20062006-11-26
Reply by ●November 26, 20062006-11-26
On Sun, 26 Nov 2006 16:11:50 GMT, Vladimir Vassilevsky <antispam_bogus@hotmail.com> wrote:> > >Jim Thompson wrote: > >>>>Please may I ask for assistance? I need a reliable method of interfacing an >>>>SPI SD/MMC card to a dsPIC. At the moment I'm using a 1k8/3k3 voltage >>>>divider on the 5v ----> 3.3v signals, and connecting the 3.3v ----> 5v >>>>signals straight to port. >>>> >> >> [snip] >> >> For 3.3V to 5V Logic... >> >> http://analog-innovations.com/SED/LogicLevelTranslator74HC14-RevA.pdf > >Wow! This is the case when the extra knowledge only harms. >Why didn't you use a simple gate of a standard LS or HCT series? > > >Vladimir Vassilevsky > >DSP and Mixed Signal Design Consultant > >http://www.abvolt.comYou're exhibiting the same ignorance of how IC's work as Yuriy K. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●November 26, 20062006-11-26
Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in message news:55hjm25jdlqar1jks8pc02no86j66vd7ov@4ax.com...> I love to cook with wine. Sometimes I even put it in the food.Hi Jim, Nothing wrong with what you've said. It's all stuff I'm reading through so none of it is wasted :-) thanks, Alison
Reply by ●November 26, 20062006-11-26
On Sun, 26 Nov 2006 16:51:21 -0000, "Alison" <alison@logicsaysNOSPAM.com> wrote:>Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in >message news:55hjm25jdlqar1jks8pc02no86j66vd7ov@4ax.com... > >> I love to cook with wine. Sometimes I even put it in the food. > >Hi Jim, > >Nothing wrong with what you've said. It's all stuff I'm reading through so >none of it is wasted :-) > >thanks, > >Alison >Thanks! These _little_boys_ just get on my nerves chastising me and saying that HCT would work properly in your application. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●November 26, 20062006-11-26
Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in message news:eghjm25ku5mn8oceoeg0pj7dbclble6gh6@4ax.com...> > Thanks! > > These _little_boys_ just get on my nerves chastising me and saying > that HCT would work properly in your application. > > ...Jim ThompsonNow, now :-) Everything everyone has said is valued. It's enabling me to build up a wider picture of what can be done and what the options are. What I do and don't do I won't announce though. :-) I'll go with what is reliable with my own eyes. The trouble with the net is that since it's so *company* driven, there is only their view since it's so difficult now to Google search for the old fashioned diy and educational stuff. If only we could go back 10-years to when companies laughed at the Internet. Searching was a hell of alot easier before they came along. Usenet has calmed down alot too, we'd be threatening to murder each other with a pickaxe by now. (those were the days). :-) Alison
Reply by ●November 26, 20062006-11-26
Jim Thompson wrote:>>> For 3.3V to 5V Logic... >>> >>> http://analog-innovations.com/SED/LogicLevelTranslator74HC14-RevA.pdf>> Incredible. Designing complicated circuit instead of simply using >> 74HCT14 / 74HCT04 / zillion other HCT74xx and AHCTxx ICs. > > You've just proved yourself an incredible dumb-shit ;-) > > You have NO clue what "HCT" actually means. It DOES NOT MEAN that a > +3.3V CMOS input is satisfactory.Your ignorance is very loud and of highest quality, I must admit. Not everybody can achieve that level. Have you ever read datasheet, or any textbook for the EE? "The Art of Electronics" would be a good start. SN74HCT14 (www.ti.com) VT+ max 2.1V VT- min 0.5V SN74HCT04 (www.ti.com.) VT+ max 2.1V VT- min 0.5V Other manufacturers have similar characteristics. Typical 3.3V logic: SN74HC04 VoutH min 3.2V @ 20uA VoutL max 0.1V @ 20uA After all these years of design it is finally time to learn the basics. :) -- WBR, Yuriy. "Resistance is futile"
Reply by ●November 26, 20062006-11-26
Jim Thompson wrote:> On Sun, 26 Nov 2006 09:57:13 -0600, "Yuriy K." <yktech@mail.ru> wrote: > > >>Jim Thompson wrote: >> >> >>>For 3.3V to 5V Logic... >>> >>>http://analog-innovations.com/SED/LogicLevelTranslator74HC14-RevA.pdf >> >>Incredible. Designing complicated circuit instead of simply using >>74HCT14 / 74HCT04 / zillion other HCT74xx and AHCTxx ICs.This is exactly correct.> > You've just proved yourself an incredible dumb-shit ;-)Extra knowledge only hurts to the fools.> > You have NO clue what "HCT" actually means. It DOES NOT MEAN that a > +3.3V CMOS input is satisfactory.RTFM, dude. It does mean that > 2.0V is guaranteed 1 and < 0.8V is guaranteed 0. The threshold is normally at 1.4V which is exactly what is required for 3.3V CMOS interfacing.> There ARE, however, specialty chips made for 3.3V <> 5V logic > translators.Oh, you don't say.> Sheeesh! Another employment candidate for Fry's ;-)Have the courage to admit the mistake, dear. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●November 26, 20062006-11-26
"Alison" <alison@logicsaysNOSPAM.com> wrote: > Hi Mike, > Thanks for the info. Reading through now. > I'm going to try and get the circuit onto PCB in the next week or > so. > The final design will also switchover to TQFP devices. At the > moment it just about serves the purpose of providing a base from > which I can develop the firmware for the chip. > To be honest, I hate breadboard!! But am not in a position to > create PCBs. The closest I can do is 0.1" pitch, printing out the > circuit, drilling the holes through, dalo-ing out the bits I want > to keep, and then ferric-ing off the rest. That's just toooooo > messy. > Prototype PCBs here in the UK are still astromonically expensive > compared to the US. > Thanks again, > Alison Hi Alison, Thanks for the reply. You might find breadboarding a lot more pleasant once you get the hang of working with copperclad. It certainly makes working with high frequency a lot easier, and a well-made board can even be used in place of a pcb. I like to use ordinary hot glue to mount components to the copper. This works great for parts that stay cool:) I'm still using prototypes I made years ago, and they work fine. Good luck with your circuit! Regards, Mike Monett Antiviral, Antibacterial Silver Solution: http://silversol.freewebpage.org/index.htm SPICE Analysis of Crystal Oscillators: http://silversol.freewebpage.org/spice/xtal/clapp.htm Noise-Rejecting Wideband Sampler: http://www3.sympatico.ca/add.automation/sampler/intro.htm
Reply by ●November 26, 20062006-11-26
On Sun, 26 Nov 2006 17:08:55 -0000, "Alison" <alison@logicsaysNOSPAM.com> wrote:>Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in >message news:eghjm25ku5mn8oceoeg0pj7dbclble6gh6@4ax.com... >> >> Thanks! >> >> These _little_boys_ just get on my nerves chastising me and saying >> that HCT would work properly in your application. >> >> ...Jim Thompson > >Now, now :-) > >Everything everyone has said is valued. It's enabling me to build up a >wider picture of what can be done and what the options are. What I do and >don't do I won't announce though. :-) I'll go with what is reliable with >my own eyes.Just go with a chip designed for the purpose.> >The trouble with the net is that since it's so *company* driven, there is >only their view since it's so difficult now to Google search for the old >fashioned diy and educational stuff. If only we could go back 10-years to >when companies laughed at the Internet. Searching was a hell of alot easier >before they came along. Usenet has calmed down alot too, we'd be >threatening to murder each other with a pickaxe by now. (those were the >days). > >:-) > >Alison >...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●November 26, 20062006-11-26
On Sun, 26 Nov 2006 17:14:00 GMT, Vladimir Vassilevsky <antispam_bogus@hotmail.com> wrote:> > >Jim Thompson wrote: > >> On Sun, 26 Nov 2006 09:57:13 -0600, "Yuriy K." <yktech@mail.ru> wrote: >> >> >>>Jim Thompson wrote: >>> >>> >>>>For 3.3V to 5V Logic... >>>> >>>>http://analog-innovations.com/SED/LogicLevelTranslator74HC14-RevA.pdf >>> >>>Incredible. Designing complicated circuit instead of simply using >>>74HCT14 / 74HCT04 / zillion other HCT74xx and AHCTxx ICs. > >This is exactly correct. > >> >> You've just proved yourself an incredible dumb-shit ;-) > >Extra knowledge only hurts to the fools. > > >> >> You have NO clue what "HCT" actually means. It DOES NOT MEAN that a >> +3.3V CMOS input is satisfactory. > >RTFM, dude. > >It does mean that > 2.0V is guaranteed 1 and < 0.8V is guaranteed 0. >The threshold is normally at 1.4V which is exactly what is required for >3.3V CMOS interfacing. > > >> There ARE, however, specialty chips made for 3.3V <> 5V logic >> translators. > >Oh, you don't say. > >> Sheeesh! Another employment candidate for Fry's ;-) > >Have the courage to admit the mistake, dear. > > > >Vladimir Vassilevsky > >DSP and Mixed Signal Design Consultant > >http://www.abvolt.com >Keep it up. Everybody is realizing the "value" of your consultancy ;-) You read a data sheet without understanding. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
