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janesbang
Joined: 02 Dec 2003
Posts: 1
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 02 Dec 2003 7:18 SPI I/O expander |
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| i need to use spi(avr) to expand more than 20 input and output.what 74" and 4000" chips should i use?
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jzo777n
Joined: 10 Sep 2002
Posts: 113
Helped: 2
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02 Dec 2003 7:47 Re: SPI I/O expander |
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I am usually using 74x165 for input and 74x595 for output
But you have a broad scale of output device with drivers from for ex. Allegro, Infineon, Motorola...
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cancel
Joined: 27 May 2001
Posts: 286
Helped: 11
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| 02 Dec 2003 11:29 |
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depends what you want .. 74164 should be fine but it is nearly impossible to get them in ls. other versions have only small current capability so it looks more reasonable and chaper then special expanders to use other avr just like port expander
regards
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cb30
Joined: 21 Feb 2002
Posts: 63
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02 Dec 2003 16:22 Re: SPI I/O expander |
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Hi all.
See this link
http://home.planetinternet.be/~dc11cd/
Regards cb30
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ME
Joined: 14 Mar 2002
Posts: 1523
Helped: 13
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| 22 Dec 2003 18:36 |
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| Please read this topic: http://www.elektroda.pl/eboard/searchtopic61376-4094.html
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Google
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22 Dec 2003 18:36 Ads |
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tobb
Joined: 20 Sep 2002
Posts: 87
Helped: 1
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| 23 Dec 2003 21:36 |
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| If you not serious that it must be 74 or 4000 try MAX7300 it i2c expan IO with 28 IO expander. You may possible to ask them for sample .. It can be both input or output .. This may be what you need
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