| Electronics > Projects, Designs, and Technical Stuff |
| 20 bit up/down counter, anything more elegant than a bunch of cascaded 4516's? |
| (1/4) > >> |
| Jester:
I need to build a 20 bit, binary up/down counter. I don't need preload, but I do need all the bits, so 4040 etc. won't work. I suppose I can cascade a bunch of 4516's, just messy with only 4 bits per chip. The 74...869 is 8 bit, but they are really expensive. There must be a better solution other than programming a small uC? I feel like I'm missing something even after searching up/down counters with google. |
| Kleinstein:
I don't know common up/down counters with more than 4 bits. There are difference version how up/down are combined. The 4040 has all the outputs for 12 bits - however it is just a simple counter, no up/down. As an alternative to a µC, there are also CPLDs, programmable logic chip that should be capable to do up/down counting for quite some bits. |
| Benta:
I agree, the 4516 (or 74HC types) are probably the solution if you want to avoid CPLDs. At least they're cheap :) |
| scuzzyTerminator:
A parametric search at digikey found these 8-bit devices pretty quick. Is TTL OK? SN74AS867, SN74AS869: http://www.ti.com/lit/ds/symlink/sn74as867.pdf |
| Benta:
--- Quote from: scuzzyTerminator on December 30, 2018, 11:09:12 pm ---A parametric search at digikey found these 8-bit devices pretty quick. Is TTL OK? SN74AS867, SN74AS869: http://www.ti.com/lit/ds/symlink/sn74as867.pdf --- End quote --- Read the OP. He already found those... |
| Navigation |
| Message Index |
| Next page |