urgent! Does anyone know 26-pin or 40-pin 8255??

hi, i'm doing a project and need a 26-pin 8255 microprocessor(i'm not sure whether its called "microprocessor") i tried many method but still cannot find it. Does anyone know any information about it!!!?

grunnen over 14 years ago

Hi,

Maybe you already discovered but this is what I can mention you.
The Intel 8255 is a Programmable Peripheral Interface: parallel port chip.
You might find one in old PCs like PC/XT with 8008, 8080A, 8086 or 8088 processors (1986-ish...).
According to Wikipedia these were also used in Z80 systems.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
WestfW over 14 years ago

I don't think the 8255 was ever available except in a 40 pin package (I don't know if ANYTHING was available in a 26 pin package!) A more modern equivalent is the CMOS version: the 82C55; this is still a very old chip, and modern vendors (Farnell/Newark included) don't seem to have stock, but some of the vendors with more history in the hobbyist market seem to still have them (both Digikey and JameCo claim to be able to ship immediately.)
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_52425_-1
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=CP82C55AZ-ND
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
DAB over 14 years ago

Hi,

The 8255 was indeed a parallel port for Intel and came in a 40 pin DIP package. Yes I do have some and they may still work. There was a serial port chip, the 8251 which was 24 pins in the same era.
There were a bunch of micro-controllers in that era that combined a 8085 MCU with integrated serial I/O and parallel I/O, but most of them were 40 pin packages. If you can clarify your requirements, I might be able to find you both chips and pinouts.
Thanks,
DAB
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
grunnen over 14 years ago

Hi WestfW,

82C55 has the same functionality?

If so. Then for dukevam: please check the Farnell site for possible solutions:

INTERSIL - CP82C55A-5ZCP82C55A-5Z - PERIPHERAL INTERFACE, 82C55, DIP40 - Ordercode: 1018159;

INTERSIL - CP82C55AZCP82C55AZ - PERIPHERAL INTERFACE, 82C55, DIP40 - Ordercode: 1018158;

INTERSIL - IP82C55AZIP82C55AZ - IC, PROGRAMMABLE CMOS INTERFACE - Ordercode: 1562050.

grunnen
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
Former Member over 14 years ago in reply to WestfW

Newark and Farnell both have this part in stock:
http://www.newark.com/intersil/cp82c55a-5/ic-prog-peripheral-interface-dip/dp/06F3290?whydiditmatch=rel_default&matchedProduct=82C55A-5&matchedProduct=82C55A-5&whydiditmatch=rel_default

http://uk.farnell.com/jsp/search/results.jsp?N=0&Ntk=gensearch_001&Ntt=82C55A-5&Ntx=mode+matchallpartial&suggestions=false&ref=globalsearch&_requestid=259747&isGoback=false&displaytext=&isRedirect=false
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
Former Member over 14 years ago

Hi J, I got this address of the internet, the same site might be useful to you for other stuff. http://www.datasheetcatalog.org/datasheet/Intel/mXuttts.pdf
Kevin
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel