8051 flash with lots of pins?

MrEd · Mar 25, 2004

Hi guys, does anyone know of any 8051 flash device with at least 70 I/O pins. I don't need speed, just lots of pins.

Cheers
Eddie

pisoiu · Mar 25, 2004

70 io pins means 9 ports of 8 bits. I don't think you will find such 8051. You can use i2c expanders like PCF8574t or latches/d-type flipflops like 74xx573/574 instead.

/pisoiu

Budiman · Mar 26, 2004

87c550 family has 55 i/o pins.
MAX7300 2-Wire-Interfaced 20-Port and 28-Port I/O Expander.

Builder++ · Mar 26, 2004

Try 2 use old 82C55A (8*3=24 pins per chip), simple cascading.
70 pins / 24 pins = ~3 pcs of 82C55A.

And you have full speed, full functuinal I/O.

DataSheets HERE (INTEL)
https://www.intel.com/design/archives/periphrl/docs/23125604.htm

eltonjohn · Mar 26, 2004

There is a chip that has that number of pins and even more !
Is in the triscend E5 familiy ..
Check them out : www.triscend.com
I think that cygnal may also have some other posibilities
www.cygnal.com

Deni · Mar 28, 2004

Silicon Laboratories (formerly Cygnal)l F02x and F12x chips have up to 8 I/O ports...

Deni

8051 flash with lots of pins?

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