? 24c1024b ?
HollyMinkowski
Posts: 1,398
Before I have 25 of these 24C1024B 128KB eeproms ordered I thought I'd ask to make certain that
they will work just the same and as easily as the 32KB ones that came from Parallax. ????
Will it be easy to use more than 1 of these in a project just like it is with the smaller ones?
The best price I found was 82.50 for 25 of them...does anyone know of an equivalent part
at a better price? This price seems high to me somehow.
Also, does anyone know of a place I can get 3.3v regulators for less than .33 each in 100 lot?
That's the best I could find (Mouser) this is almost double what the 7805 costs :-(
I'm also looking for cheap VGA and mouse/kbrd connectors if anyone knows a good supplier.
I don't want to waste money even if it's not my own so any suggestions are sure welcome.
they will work just the same and as easily as the 32KB ones that came from Parallax. ????
Will it be easy to use more than 1 of these in a project just like it is with the smaller ones?
The best price I found was 82.50 for 25 of them...does anyone know of an equivalent part
at a better price? This price seems high to me somehow.
Also, does anyone know of a place I can get 3.3v regulators for less than .33 each in 100 lot?
That's the best I could find (Mouser) this is almost double what the 7805 costs :-(
I'm also looking for cheap VGA and mouse/kbrd connectors if anyone knows a good supplier.
I don't want to waste money even if it's not my own so any suggestions are sure welcome.
Comments
Assuming you are parallelling the eeproms... There are 3 Address lines on the 24C256 A0-A2. However on the larger 24C512 only 2 bits are used (A0 is used internally) and on the 24C1024 only 1 address line is used externally (my data sheet says A1) and the other two are internal. So you can only address 256KB in total of these eeproms in parallel.
There may be other cheaper options depending on what you are trying to do, such as the SPI W25X32/64 (1MB-8MB). I think Mike Green did a driver for these recently.
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In terms of using it with the propeller tool it's as easy as programming a 32KB device and works the same way. But if you want to program the upper memory from PC you have to find a different way. The propeller tool will never touch the upper memory.
In terms of I2C bus it's a little bit different. A 32kB device eats up 1 device adress, whereas the 128kB chip eats up 4 device adresses. So, you can not use 8 24C1024 on one I2C bus - max. is 2.
I can't tell you yet how it behaves if you read/write across device adress boundaries. I mean if you set the adress to $7ff0 and you want to read/write 128 bytes, what will happen? Does it wrap around to $0000?
I personally use the 64kB FRAM. The upper memory is used for storing PASM code I directly load into COGs - and maybe some important configuration data. For a bigger amount of data I prefere to use an SD card.
Avnet have them ex stock, any qty up to a few hundred at $2.65 ea (TSSOP) or $2.56 ea (SOIC).
With Avnet express you just have to ignore their confusing minimum order stuff. They will sell you small qtys. Just add 25 to the basket and go from there
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