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#1
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
Anyone used a 74HC191 UP/DOWN Counter, 3-stages?
Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 |
#2
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
In article ,
Jim Thompson writes: Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? I've used that chip or one of it's cousins, but that was a long time ago. I don't think you can get a simple TC out for the middle of the chip. If you are just counting up, you can brew your own with a 3 input AND gate using the TC in and the bottom two bits of the top chip. Mumble, I'm not sure of the polarity on the TC. It might take some inverters. -- These are my opinions, not necessarily my employer's. I hate spam. |
#3
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
"Jim Thompson" wrote in message ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Check MC14158 or possibly 74LS491 Might be time to get a PIC |
#4
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On Sat, 14 Feb 2009 17:48:31 -0700, Jim Thompson
wrote: Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson Try a 74190 or 74192 or 74196 decade counter (I assume you mean a count of 10, since all of these are 4 bit counters.) -- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
#5
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On Sun, 15 Feb 2009 09:55:08 -0800, Peter Bennett
wrote: On Sat, 14 Feb 2009 17:48:31 -0700, Jim Thompson wrote: Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson Try a 74190 or 74192 or 74196 decade counter (I assume you mean a count of 10, since all of these are 4 bit counters.) No. 10-BITs ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 |
#6
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On Sat, 14 Feb 2009 17:48:31 -0700, Jim Thompson
wrote: Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson --- _ If U/D is low (you're counting up) you could decode 0x0cff and use the decode to broadside load zeros into the counters. _ __ Conversely, if U/D is high (counting down), you could use RC to load 0x0cff into the counters. JF |
#7
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
"Jim Thompson" schreef in bericht ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 As these are 4-bit counters you will need three of them. Each has its own TC so to get a TC for the whole counter, you need to *AND* the TCs. To limit the counter to 10 bits, you'll have to make your own TC for the two least significant bits of the most significant chip. |\ __ U/D-------+---| O---| | | |/ | | Q0----+--|----------|& |o---+ | | | | | Q1--+-|--|----------|__| | | | | | __ | | | +-| | | | | |& |o-+ TC2 | | | +-|__| | | | | __ | | | | +----------| | | | | | |\ | | | | | +------| O---|& |o---+ | | |\ |/ | | | __ +---| O--------|__| +-| | |/ | | TC1------------------------------------|& |--- TC10BIT | | TC0------------------------------------|__| created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de petrus bitbyter |
#8
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On Sun, 15 Feb 2009 22:59:12 +0100, "petrus bitbyter"
wrote: "Jim Thompson" schreef in bericht ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 As these are 4-bit counters you will need three of them. Each has its own TC so to get a TC for the whole counter, you need to *AND* the TCs. To limit the counter to 10 bits, you'll have to make your own TC for the two least significant bits of the most significant chip. |\ __ U/D-------+---| O---| | | |/ | | Q0----+--|----------|& |o---+ | | | | | Q1--+-|--|----------|__| | | | | | __ | | | +-| | | | | |& |o-+ TC2 | | | +-|__| | | | | __ | | | | +----------| | | | | | |\ | | | | | +------| O---|& |o---+ | | |\ |/ | | | __ +---| O--------|__| +-| | |/ | | TC1------------------------------------|& |--- TC10BIT | | TC0------------------------------------|__| created by Andy? ASCII-Circuit v1.24.140803 Beta www.tech-chat.de petrus bitbyter Done! As usual the Analog Guy wings it successfully ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | It's what you learn, after you know it all, that counts. |
#9
Posted to alt.binaries.schematics.electronic
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UP/DOWN Counter - UD-CTR-10BIT-74HC191.pdf
On Sun, 15 Feb 2009 15:03:29 -0700, Jim Thompson
wrote: On Sun, 15 Feb 2009 22:59:12 +0100, "petrus bitbyter" wrote: [snip] As these are 4-bit counters you will need three of them. Each has its own TC so to get a TC for the whole counter, you need to *AND* the TCs. To limit the counter to 10 bits, you'll have to make your own TC for the two least significant bits of the most significant chip. |\ __ U/D-------+---| O---| | | |/ | | Q0----+--|----------|& |o---+ | | | | | Q1--+-|--|----------|__| | | | | | __ | | | +-| | | | | |& |o-+ TC2 | | | +-|__| | | | | __ | | | | +----------| | | | | | |\ | | | | | +------| O---|& |o---+ | | |\ |/ | | | __ +---| O--------|__| +-| | |/ | | TC1------------------------------------|& |--- TC10BIT | | TC0------------------------------------|__| created by Andy? ASCII-Circuit v1.24.140803 Beta www.tech-chat.de petrus bitbyter Done! As usual the Analog Guy wings it successfully ;-) ...Jim Thompson See attachment ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 |
#10
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On Sun, 15 Feb 2009 12:10:12 -0700, Jim Thompson
wrote: On Sun, 15 Feb 2009 09:55:08 -0800, Peter Bennett wrote: On Sat, 14 Feb 2009 17:48:31 -0700, Jim Thompson wrote: Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? Thanks! No real use, just need it as a behavioral counter for simulations ;-) ...Jim Thompson Try a 74190 or 74192 or 74196 decade counter (I assume you mean a count of 10, since all of these are 4 bit counters.) No. 10-BITs ...Jim Thompson Sorry - I missed the "three stages" when I saw your message in ABSE, and realized my error when I saw it again in SED. -- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
#11
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On 2009-02-15, bw wrote:
"Jim Thompson" wrote in message ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? can't you just ignore the two high bits ? or do the top two bits some other way? |
#12
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On 18 Feb 2009 11:22:03 GMT, Jasen Betts wrote: On 2009-02-15, bw wrote: "Jim Thompson" wrote in message ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? can't you just ignore the two high bits ? or do the top two bits some other way? I need to simulate what another designer will ultimately do at device-level. Counter must not over-run, top or bottom. (It's a tracking ADC.) I have it cobbled together and running with existing digital (behavioral) parts in PSpice; so I can test my analog portions quickly. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)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 |
#13
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
"Jim Thompson" wrote in message I need to simulate what another designer will ultimately do at device-level. Counter must not over-run, top or bottom. (It's a tracking ADC.) Is there an analog way to stabilize the outputs? -- Reply in group, but if emailing add one more zero, and remove the last word. |
#14
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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UP/DOWN Counter
On 2009-02-18, Jim Thompson wrote:
On 18 Feb 2009 11:22:03 GMT, Jasen Betts wrote: On 2009-02-15, bw wrote: "Jim Thompson" wrote in message ... Anyone used a 74HC191 UP/DOWN Counter, 3-stages? Is there a way I can limit Terminal Count to 10-Bit? can't you just ignore the two high bits ? or do the top two bits some other way? I need to simulate what another designer will ultimately do at device-level. Counter must not over-run, top or bottom. (It's a tracking ADC.) I have it cobbled together and running with existing digital (behavioral) parts in PSpice; so I can test my analog portions quickly. ah, I suppose you've already thought of this: TC0 ---------------------------+- ___ TC1 ---------------------------|&)-- CE0 .---+- bit8 --+------+- | bit9 +-|------|&)---. | | | .-o-+- | | _ | | | `--+ | U/D -|-|-+----+ )1-' | `------)1o-----+ `--------+ TC0 and TC1 are TC from the low order chips ___ bit8,9 are D0 & D1 fron the high chip, and CE0 is clock enable on the low chip. or could you just clock it 4 times faster and ignore the low bits?___ then you'd just need to and the three TCs together and feed it to CE0 |
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