I'm making a little circuit on my breadboard, and I need to convert a 4-bits parallel signal to display its hexadecimal value on a common anode 7-segment display.
I've found many ICs like the MC14495 and the DM9368, but they're for "common cathode" displays, while I have a common anode display.
Then I've tried the CD4543, but it count only to 9, and does not display A-F values.
And the 74LS47 displays random symbols after the number 9, not hex values.
I'm trying to make things as little as possible, so I'm not trying to use inverters, or other ICs, I need everything in one IC like the MC14495 but for common anode displays.
And no, I DO NOT want to use MCUs, ROMs, CPLDs or FPGAs, remember, I'm trying to make everything as small as possible.
I know this isn't related to Arduinos, but I hope someone will help me.
Not as easy as you’d hope as you’ll want to display a-f on your seven segment display , so a 4067 ( analog multiplexer ???) won’t do it .
Really a microprocessor, makes the simplest convertor with lowest parts count
Why do you want to do this ? Where does your binary data come from?
There maybe other solutions .
I'm trying to do it from scratch, so no microprocessors.
I'm making a simple 8-bit computer on breadboard, I want the address to be displayed on 2 7-SEG displays in hex instead of 8 different LEDs, it's cooler.
It comes from 2 SN74163 binary counters.
Already looked at this, I'm trying to find a IC just for that, not any ROM or programmable memory, it's too overkill I'm trying to save space.
And I love saving space, no MCU or ROMs allowed.
It doesn't display characters from 0 to F, but from 0 to 9.
As said on top, MCUs/CPUs are NOT allowed, I'm trying to make everything from scratch as it helps me understand more about circuit design, etc.
The main problem is S - P - A - C - E so it needs to be a dedicated IC.
now THIS is interesting, Imma going to take a look at that, if someone has more ideas let me know thx.
I don't want to spend more money to order the chatode ones, now I have the anode ones, and I want to find out if an IC like this exists, it's my personal challenge.
After a bit of research I've found out that it's not as easy to interface as it needs external ICs.
40 years ago, a 256x8 prom would do it. If asked then, I'd have used a 2kx8 eprom (The old UV eraseables). No idea what's available to you, but those are some concepts.
The goal for my project is to make a functional CPU on breadbards, using even an Attiny MCU would be cheating.
They're not allowed for my project, even if it's free.
I exactly have them!
The issue from using ROM chips for this is because they're big, so 2 of them to control 2 displays would be a waste of space even if it seems small, I only have 1/3 of a breadboard available, so I need something DIP-16 max.
An ATtiny85 is not big, is an I.C., can do your "bin2hex", but your "specifications" are not specific. Further, why are you not doing all this research, rather than dribbling out bits of information, and rejecting attempts at help. If "I" wanted to make a project (for me, or for school), "I" would read and write and make. Give it a try.
Sebastian Lague on YouTube will bring you all the way from logic gates to displaying characters on seven segment LEDs... be patient... do not skip...
I did hours of research to find a circuit that could satisfy those criteria, I didn't found anything, so I'm asking here.
I didn't reject anything, it just doesn't respect those criteria.
I actually already watched his series, I watched the majority of videos on YouTube that explains computers with bare bone logic, including all the Ben Eater videos.
Thanks for the suggestion tho!
You can still buy NOS TTL PROMS. An open collector one will have enough drive current for a 7-segment display. You might have to settle for a 20 pin skinny DIP though.
Or here is a 16-pin 32 x 8 that might do the job.
NTE74S288
