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"Mark J. Dulcey" wrote:
> It's a 1Kx4 bipolar PROM; they were made by Signetics and other
> companies. The 27S33, made by AMD and others, is a pin-compatible part.
> I had no success at finding data sheets for either part number online,
> but old data books should have info.
OK
> Bipolar PROMs used to be popular for storage of microcode and the like,
> because they are fast (access speeds in the 15-40 ns range). They're
> power-hungry, though. Mostly, cheap standard microprocessors killed the
> niche for them; in the few applications that might still need such a
> thing, I think people mostly use fast SRAM and load it from an EPROM or
> flash ROM.
I know what their purpose is...
But, i would like to made some stand-alone application with them... eg. running light or simmilar...
Programmer is no problem...
Thanks anyway!
> To use a bipolar PROM, you have to have some way of programming it.
> Since they're not used much now, newer programmers aren't likely to
> support them. There are a few currently available programmers that can
> program bipolar PROMs, such as the Data I/O Chipwriter.
>
> The entire product category is mostly extinct now, but TI evidently
> still makes a few.
> (http://www-s.ti.com/cgi-bin/sc/generic2.cgi?keyword=PROMS&status=2&family=PROMS&tech=All&return=2000)
>
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"Mark J. Dulcey" wrote:
It's a 1Kx4 bipolar PROM; they were made by Signetics
and other
companies. The 27S33, made by AMD and others, is a pin-compatible part.
I had no success at finding data sheets for either part number online,
but old data books should have info.
OK
Bipolar PROMs used to be popular for storage of microcode
and the like,
because they are fast (access speeds in the 15-40 ns range). They're
power-hungry, though. Mostly, cheap standard microprocessors killed
the
niche for them; in the few applications that might still need such
a
thing, I think people mostly use fast SRAM and load it from an EPROM
or
flash ROM.
I know what their purpose is...
But, i would like to made some stand-alone application with them...
eg. running light or simmilar...
Programmer is no problem...
Thanks anyway!
To use a bipolar PROM, you have to have some way
of programming it.
Since they're not used much now, newer programmers aren't likely to
support them. There are a few currently available programmers that
can
program bipolar PROMs, such as the Data I/O Chipwriter.
The entire product category is mostly extinct now, but TI evidently
still makes a few.
(http://www-s.ti.com/cgi-bin/sc/generic2.cgi?keyword=PROMS&status=2&family=PROMS&tech=All&return=2000)
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