Mike Singer wrote:
> Michael Milner wrote:
>
>>I've been prototyping a circuit that connects two 16550
>>Serial UARTs to a
>>PIC (the PIC16F877).  I know the PIC already has a UART, but
>>I'm using that
>>already.  I was thinking about doing some bit banging to eliminate the
>>external UARTs, but in my application I need the speed and
>>accuracy of these
>>external UARTS.
>>
>
>
>    How about using PIC16LF627-04 ($2, AUSART) instead of 16550 UART?
> What is the price of 16550?


I looked up the 16C550 on Digi-Key; they cost US$3.92 in singles, or
$2.43 in 100 quantity. (The old non-CMOS 16550 is even more expensive.)
Using the 16C552 dual UART gets you a little closer; they're $7.04 in
singles or $4.75 for 100, and you get two UARTs per chip. (But you have
to deal with PLCC or LQFP packages.) At those prices, it's actually
cheaper to use a couple of extra PICs than to use UARTs - 16F627s are
only $3.20 in singles, or $1.69 in 100 quantity! The economics of this
business are strange sometimes...

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