Got annoyed at the flaky 555 models that are out there, so I rolled my own... http://www.analog-innovations.com/SED/MyLMC555.zip Based on old AMI 20V CMOS device models, mostly form/fit/function with CMOS, but some behavioral on the front-end where it doesn't matter. Optimized and fitted to National LMC555 at 5V operation. It'll work at other voltages but may sink/source more or less than spec at other voltages because of ancient 5u devices :-) Try it out and let me know. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
New 555 Spice Model
Started by ●March 18, 2011
Reply by ●March 18, 20112011-03-18
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb im Newsbeitrag news:tep7o6p6m5phjofimc1336tulv7919h7ht@4ax.com...> Got annoyed at the flaky 555 models that are out there, so I rolled my > own... > > http://www.analog-innovations.com/SED/MyLMC555.zip > > Based on old AMI 20V CMOS device models, mostly form/fit/function with > CMOS, but some behavioral on the front-end where it doesn't matter. > > Optimized and fitted to National LMC555 at 5V operation. It'll work > at other voltages but may sink/source more or less than spec at other > voltages because of ancient 5u devices :-) > > Try it out and let me know. > > ...Jim Thompson > -- > | James E.Thompson, CTO | mens | > | Analog Innovations, Inc. | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | Phoenix, Arizona 85048 Skype: Contacts Only | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon at http://www.analog-innovations.com | 1962 | > > I love to cook with wine. Sometimes I even put it in the food.Hello Jim, Thanks a lot for this model. I have made an example with your model and uploaded it to the Yahoo group. Files > Lib > CMOS Timers TLC555, TLC556, LMC555 > Example LMC555 http://tech.groups.yahoo.com/group/LTspice/files/%20Lib/CMOS%20Timers%20TLC555%2C%20TLC556%2C%20LMC555/Example%20LMC555/ Best regards, Helmut
Reply by ●March 18, 20112011-03-18
On Sat, 19 Mar 2011 00:52:38 +0100, "Helmut Sennewald" <helmutsennewald@t-online.de> wrote:>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb >im Newsbeitrag news:tep7o6p6m5phjofimc1336tulv7919h7ht@4ax.com... >> Got annoyed at the flaky 555 models that are out there, so I rolled my >> own... >> >> http://www.analog-innovations.com/SED/MyLMC555.zip >> >> Based on old AMI 20V CMOS device models, mostly form/fit/function with >> CMOS, but some behavioral on the front-end where it doesn't matter. >> >> Optimized and fitted to National LMC555 at 5V operation. It'll work >> at other voltages but may sink/source more or less than spec at other >> voltages because of ancient 5u devices :-) >> >> Try it out and let me know. >> >> ...Jim Thompson[snip]> > >Hello Jim, > >Thanks a lot for this model. > >I have made an example with your model and uploaded it to the Yahoo group. > >Files > Lib > CMOS Timers TLC555, TLC556, LMC555 > Example LMC555 >http://tech.groups.yahoo.com/group/LTspice/files/%20Lib/CMOS%20Timers%20TLC555%2C%20TLC556%2C%20LMC555/Example%20LMC555/ > >Best regards, >Helmut >Thanks, Helmut! Let me know of any complaints! ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Remember: Once you go over the hill, you pick up speed
Reply by ●March 18, 20112011-03-18
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb im Newsbeitrag news:bus7o6drmsa2vbhrtajn2gsalp6qrcinqf@4ax.com...> On Sat, 19 Mar 2011 00:52:38 +0100, "Helmut Sennewald" > <helmutsennewald@t-online.de> wrote: > >>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb >>im Newsbeitrag news:tep7o6p6m5phjofimc1336tulv7919h7ht@4ax.com... >>> Got annoyed at the flaky 555 models that are out there, so I rolled my >>> own... >>> >>> http://www.analog-innovations.com/SED/MyLMC555.zip >>> >>> Based on old AMI 20V CMOS device models, mostly form/fit/function with >>> CMOS, but some behavioral on the front-end where it doesn't matter. >>> >>> Optimized and fitted to National LMC555 at 5V operation. It'll work >>> at other voltages but may sink/source more or less than spec at other >>> voltages because of ancient 5u devices :-) >>> >>> Try it out and let me know. >>> >>> ...Jim Thompson > [snip] >> >> >>Hello Jim, >> >>Thanks a lot for this model. >> >>I have made an example with your model and uploaded it to the Yahoo group. >> >>Files > Lib > CMOS Timers TLC555, TLC556, LMC555 > Example LMC555 >>http://tech.groups.yahoo.com/group/LTspice/files/%20Lib/CMOS%20Timers%20TLC555%2C%20TLC556%2C%20LMC555/Example%20LMC555/ >> >>Best regards, >>Helmut >> > > Thanks, Helmut! > > Let me know of any complaints! > > ...Jim Thompson > -- > | James E.Thompson, CTO | mens | > | Analog Innovations, Inc. | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | Phoenix, Arizona 85048 Skype: Contacts Only | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon at http://www.analog-innovations.com | 1962 | > > Remember: Once you go over the hill, you pick up speedHello Jim, I have to use ".ic V(timing_cap)=0" to get the simulation quickly started. Best regards, Helmut
Reply by ●March 18, 20112011-03-18
On Sat, 19 Mar 2011 01:15:23 +0100, "Helmut Sennewald" <helmutsennewald@t-online.de> wrote:> >"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb >im Newsbeitrag news:bus7o6drmsa2vbhrtajn2gsalp6qrcinqf@4ax.com... >> On Sat, 19 Mar 2011 00:52:38 +0100, "Helmut Sennewald" >> <helmutsennewald@t-online.de> wrote: >> >>>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> schrieb >>>im Newsbeitrag news:tep7o6p6m5phjofimc1336tulv7919h7ht@4ax.com... >>>> Got annoyed at the flaky 555 models that are out there, so I rolled my >>>> own... >>>> >>>> http://www.analog-innovations.com/SED/MyLMC555.zip >>>> >>>> Based on old AMI 20V CMOS device models, mostly form/fit/function with >>>> CMOS, but some behavioral on the front-end where it doesn't matter. >>>> >>>> Optimized and fitted to National LMC555 at 5V operation. It'll work >>>> at other voltages but may sink/source more or less than spec at other >>>> voltages because of ancient 5u devices :-) >>>> >>>> Try it out and let me know. >>>> >>>> ...Jim Thompson >> [snip] >>> >>> >>>Hello Jim, >>> >>>Thanks a lot for this model. >>> >>>I have made an example with your model and uploaded it to the Yahoo group. >>> >>>Files > Lib > CMOS Timers TLC555, TLC556, LMC555 > Example LMC555 >>>http://tech.groups.yahoo.com/group/LTspice/files/%20Lib/CMOS%20Timers%20TLC555%2C%20TLC556%2C%20LMC555/Example%20LMC555/ >>> >>>Best regards, >>>Helmut >>> >> >> Thanks, Helmut! >> >> Let me know of any complaints! >> >> ...Jim Thompson >> -- >> | James E.Thompson, CTO | mens | >> | Analog Innovations, Inc. | et | >> | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | >> | Phoenix, Arizona 85048 Skype: Contacts Only | | >> | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | >> | E-mail Icon at http://www.analog-innovations.com | 1962 | >> >> Remember: Once you go over the hill, you pick up speed > >Hello Jim, > >I have to use ".ic V(timing_cap)=0" to get the simulation quickly started. > >Best regards, >Helmut >Same here. Otherwise the latch doesn't know "high" from "low" ;-) Or just RESETbar to initialize. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Remember: Once you go over the hill, you pick up speed
Reply by ●March 18, 20112011-03-18
On 3/18/2011 7:13 PM, Jim Thompson wrote:> Got annoyed at the flaky 555 models that are out there, so I rolled my > own... > > http://www.analog-innovations.com/SED/MyLMC555.zip > > Based on old AMI 20V CMOS device models, mostly form/fit/function with > CMOS, but some behavioral on the front-end where it doesn't matter. > > Optimized and fitted to National LMC555 at 5V operation. It'll work > at other voltages but may sink/source more or less than spec at other > voltages because of ancient 5u devices :-) > > Try it out and let me know. > > ...Jim ThompsonHi Jim, Thanks for taking the time to create this model. I was doing some experimenting with it and comparing it to the standard bipolar 555 model, and noticed that the CMOS model seems to have significantly greater shoot-through current than the bipolar model. I haven't used a CMOS 555 or measured those currents "in real life", so I'm curious if that is a real difference, or perhaps the bipolar 555 models don't model it effectively?
Reply by ●March 19, 20112011-03-19
On Friday, March 18, 2011 5:15:23 PM UTC-7, Helmut Sennewald wrote:> "Jim Thompson" <To-Email-Use-Th...@On-My-Web-Site.com> schrieb > im Newsbeitrag news:bus7o6drmsa2vbhrtajn2gsalp6qrcinqf@4ax.com... > > On Sat, 19 Mar 2011 00:52:38 +0100, "Helmut Sennewald" > > <helmuts...@t-online.de> wrote: > > > >>"Jim Thompson" <To-Email-Use-Th...@On-My-Web-Site.com> schrieb > >>im Newsbeitrag news:tep7o6p6m5phjofimc1336tulv7919h7ht@4ax.com... > >>> Got annoyed at the flaky 555 models that are out there, so I rolled my > >>> own... > >>> > >>> http://www.analog-innovations.com/SED/MyLMC555.zip > >>> > >>> Based on old AMI 20V CMOS device models> I have to use ".ic V(timing_cap)=0" to get the simulation quickly started.It's possible that would miss some real behaviors, of course; could the flip-flop transistors get some explicit gate capacitors? Those would hold the state info of the flip-flop, and allow the initial timing cap charges of low, medium, high, to have different initial effects. I'm curious, why is the differential amplifier 'tanh'? That isn't the analytic form for square-law MOSFETs, is it?
Reply by ●March 22, 20112011-03-22
On 03/18/2011 09:46 PM, Bitrex wrote:> > Thanks for taking the time to create this model. I was doing some > experimenting with it and comparing it to the standard bipolar 555 > model, and noticed that the CMOS model seems to have significantly > greater shoot-through current than the bipolar model. I haven't used a > CMOS 555 or measured those currents "in real life", so I'm curious if > that is a real difference, or perhaps the bipolar 555 models don't model > it effectively?Can't say about this specific family, but we had a HORRIBLE experience last year with a recent 5 V single-gate part, in the 74LVC1G family. We had a pair of analog comparators and a gate and FF from this family in each channel of a circuit, packing 32 channels per 6-layer board. We tried all SORTS of schemes to isolate the triggering of one channel from others. Eventually, I thought to try measuring the shoot-through pulses of the parts. I measured them as a complete channel, so it was one gate PLUS one FF. I was able to estimate the shoot-through current at 2 A for about 2 ns! Yikes, 2 AMPS!!! No WONDER it was crapping up the analog section. So, I started scanning data sheets for low equivalent switching capacitance, and found some 3.3 V parts that showed much lower equiv capacitance. That was the 74AUP1G family. I had to use 3 parts to get the gating configuration I needed, and re-design the whole board to run off 3.3 V instead of 5 V, but in the end it was a much cleaner board, as well as fixing the inter-channel interference problem. These chips are so quiet I can't really measure the shoot-through pulse. With the others, I observed a substantial Voltage dip in the local decoupling caps. I kind of think the 74LVC1G parts had some really crummy design, and made no effort whatsoever to control the turn-on and turn-off times of the output stage transistors, just had one driver stage feeding both P- and N-channel devices. My guess is that the 74AUP1G parts have separate drivers for the P- and N-channel output transistors and have some R-C tweaking via sizing the drivers so that they can tune the turn-on and turn-off precisely to get rid of shoot-through. I was astounded at 2 A shoot-throughs, and can imagine this could bite even a purely digital design, even if only in the EMI compliance area. Man, a 2 A pulse at some clock frequency could really turn into a major transmitter! Jon
Reply by ●March 22, 20112011-03-22
About 5 years ago I did a design for a simple TRF receiver that used small Xicon (Mouser) tunable coils in the 50-200 nanohenry range, size 10 mm and 7 mm series. Now they've gone to a minimum of 5000 pieces per value and by my calculations that will take me well into the next century at current use rates. Anybody got a good source for small tunable coils, preferably shielded? Thanks, Jim
Reply by ●March 22, 20112011-03-22
On Fri, 18 Mar 2011 22:46:48 -0400, Bitrex <bitrex@de.lete.earthlink.net> wrote:>On 3/18/2011 7:13 PM, Jim Thompson wrote: >> Got annoyed at the flaky 555 models that are out there, so I rolled my >> own... >> >> http://www.analog-innovations.com/SED/MyLMC555.zip >> >> Based on old AMI 20V CMOS device models, mostly form/fit/function with >> CMOS, but some behavioral on the front-end where it doesn't matter. >> >> Optimized and fitted to National LMC555 at 5V operation. It'll work >> at other voltages but may sink/source more or less than spec at other >> voltages because of ancient 5u devices :-) >> >> Try it out and let me know. >> >> ...Jim Thompson > >Hi Jim, > >Thanks for taking the time to create this model. I was doing some >experimenting with it and comparing it to the standard bipolar 555 >model, and noticed that the CMOS model seems to have significantly >greater shoot-through current than the bipolar model. I haven't used a >CMOS 555 or measured those currents "in real life", so I'm curious if >that is a real difference, or perhaps the bipolar 555 models don't model >it effectively?--- Notice that the shoot-through current for an ICM7555, in real life, as indicated on page 6 of: http://datasheets.maxim-ic.com/en/ds/ICM7555-ICM7556.pdf is very small compared to that from the bipolar 555, so there's either something wrong with Jim's model, or you're making an error of some kind. --- JF
