Hello,
I am doing one new design with 186 processor and I want a serial port on the board.
Please suggest any UART for that.
I have used 8251 before in older design but was worried about availability because that is a old part in DIP package. Any 8251 pin comapatable devices in SMD package. Thanks for the suggestions,
Naimesh
How about the UART that comes on most 186 parts these days?
The 8251 is obsolete, unless someone's taken it up again -- probably because everything under the sun has a built-in UART these days. The last time I had to do a search the only thing available was a Philips part and their peripherals are _twisted_.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
The 8251 is obsolete. There are several variations on the 16550 UARTs (singles, duals, quads, variying amount of FIFO memory). These are available from TI, Philips and several other manufacturers.
If you could make the 8251 work, then you will be able to use a 16550 type with a little bit of extra work for programming the registers.
But you can still get 8251s. For example, Jameco
Rob Young
What other 'support chips', are you likely to need?. There are a lot of 'all in one' chips available, that give you some programmable I/O, timers, UART etc., in a single chip. If you need more than just the UART, it might be worth considering one of these.
Best Wishes
Naimesh schrieb:
As Tim pointed out, finding something dedicated might be difficult. You could also glue a 89C2051 with a small CPLD to your 186. Might also be cheaper.
Regards Markus
"Naimesh" wrote
Along with the suggestions of high-integration '186 uPs and the 16550 you might want to try the 2651 family.
I would contact the mfg. before design-in to make sure the part is not scheduled to go down the tubes in the near future.
Parts with high military usage often stay around for a long while.
-- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
I use the MAX3100 UART for this sort of add-on. Needs SPI bus to operate, but thats pretty standard on most controllers. May not be available on a 'bare' 186 processor.
-- Regards, Adrian Jansen adrianjansen at internode dot on dot net Design Engineer J & K Micro Systems Microcomputer solutions for industrial control Note reply address is invalid, convert address above to machine form.
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In the old days of the first IBM PCs the 8250 was choosen. It was said almost obsolete but it was used in AT's as well. It was a horrible thing as there were lots of small differences between manufacturers and series and a lot of them were also buggy. New, compatible UARTS were developed and the
16550 is the last one in these series. FAIK it is stable and bugfree. It is sold as PC16550D (National), SC16C550B(Philips), TL16C550(Texas) and some more. At least the Philips version comes in packages DIP40, PLCC44 and LQFP48. Some google for the datasheets will learn you more. Hardware interfacing will hardly differ from the 8251.petrus bitbyter
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I can believe they are stable, but I heard the classic PC COM port doesn't do hardware handshaking correctly. I can't recall the details but I'm told it was a known problem but nobody would fix it for fear of incompatibility problems, and that there are software kludges to tackle it.
RS232 ports are disappearing from the desktop. Has the OP considered a USB chip? I've just used a chip from FTDI and it makes interfacing even easier than a UART chip. No pesky baud rates for example.
K.
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