David Stubbs wrote:
>
>For a project I am working on I want to use a temporary memory store.
>Probably big enough to hold around 100,000 Boolean values. However, the
>problem is I want reads and preferably writes to be quite fast. Ideally
><1uS. The quicker the better. Can any of you recommend any products which
>may be of use? I will be interfacing it with a PIC.
>


Hi Dave, this doesn't quite solve your problem, but will give you
some background info. I have a PIC SBC with 32KB SRAM chip on it.

http://www.oricomtech.com/sbc40.htm

Using a '74/'877/etc, running with 20 mhz xtal = 5 usec instruction
time, it takes right about 2 usec to read/write SRAM when needing
to address all 15 address lines. For only 8-bit addressing, it
runs about 2X as fast.

< 1 usec would be difficult to get with a straightforward scheme,
especially if you are needing to convert from byte to boolean on
the fly. Maybe you can try an 18Cxx, or FIFO.

best regards,
- dan michaels
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