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Most devices need to be tested at least once after assembly. Testers can usually program, too.Consider a factory building a widget. One option is take circuit board using discretes, solder parts, and done.
I have not disputed this.Bottom line, I think it is important to learn basic design, and no when to use a particular technology.
There are other programmable parts that do.What do you do if you need a divide by N at say 300 MHz? How many PIC's operate at the frequency?
But I still contend, that for a casual circuit builder that wants to make a simple divider circuit that should take a hour to construct, why in bleeps sake would you have them order $50. worth of supplies, weeks of reading just to divide a signal. In this case, simple is best, not to mention they learn a little about the hardware they are using.
Okay, I'm stupid, I way over-complicated things. Here's a new schematic with a Divide-by-500 glued together, and a Divide-by-2 to latch it. Nevermind the part numbers obviously, you'd have to use matching TTL or CMOS parts to equal out the logic levels.
hi AG,
If you havn't started the buy/build yet, look at the Intersil ICM7217I.
Its a 4 digit BCD counter with a preload compare register and an Equals output, etc.
If required it will also drive a 4 digit LED directly.
Datasheet from DatasheetArchive :: Free Datasheet Search Engine :: Electronic Components
The 74HC93/4020's in your present circuit are asynchronous counters, you could have problems with gate glitches.
A: I'm not building anything, just trying to show the OP what logic you'd need.B: What do you think of the revised one with a single counter and only 4000-series logic?
Hello board ^^, just recently someone got me involved in a project where they are making hydrogen gas for their car with electrolysis. They got me building all the electronics for it, and they are doing the mechanical aspect. I have everything about 80% done, expect for one part:
One sub-circuit requires a divide by N where 1000 input pulses = 1 output pulse. The circuit is using a CD4059, the problem is that the schematic only shows a block diagram for that part o.o.
The chip itself is considered obsolete, I managed to order 5 of them, but I can't figure out how to get it to divide by 1000?
If anyone can help me, I will greatly appreciate it. Also, a modern or different way of doing it is welcome, but as I said I have 5 of the CD4059's.
Thanks
I agree.Well, you make some good points, and I cannot deny the facts that even in the hardware world that coding is becoming the trend. Be that as it may, even with VHDL and other design languages, ASIC designers will still need a basic knowledge of digital design to properly implement their code.
Yes and No. I think that programing at some level has become (or soon will be) a required skill for anyone designing digital circuits. The programmer and parts should, maybe will, be on hand. It is realistic to expect these people to learn how to program rather then work around it.But I still contend, that for a casual circuit builder that wants to make a simple divider circuit that should take a hour to construct, why in bleeps sake would you have them order $50. worth of supplies, weeks of reading just to divide a signal. In this case, simple is best, not to mention they learn a little about the hardware they are using.
I hope you realize my tone is not aggressive, and I harbor no hard feelings, nor do I wish any in return, just voicing my thoughts in a free exchange of ideas![]()
Im in the same boat with this problem, can anyone tell me the pin configuration to make the cd4059 divide by 1000, ive got the data sheet but im only new to this game!!!! please help:
Hello Chemelec,
I saw you schematic drawing on the CD4059A pins hookup to 12 Volts and grounds to make N = 1000.
Now do you wire these pins connections perminantly ?
I heard people said it takes three clock cycles to program the chip, then removed the connections. Which way is the correct way ?
Thanks,
Johnny