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PICList Thread
'ISD2500 Chips'
1997\02\14@160212 by Martin McCormick

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       I am planning to build a PIC project using ISD2500 chips as a
temporary audio storage buffer.  Since the technology is a specialized form
of EROM, does anybody know if they have a finite number of reuse cycles?
Since my project might easily cause one of the devices to go through 20
to 30 record and play cycles a day, a reuse limit of a few hundred cycles
such as we have in flash ROM's might make me rethink the whole design.  The
longer the record time, the smaller the number of reuse cycles, but the whole
idea is to reduce the amount of mechanical activity on an attached tape
recorder.

Martin McCormick

1997\02\14@162106 by Michael Yano

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I just got a data book from ISD, it says
'The message is retained for up to 100 years typically without power. In
addition, the device can be r-recorded typically over 100,000 times.'

I'm not sure if they could have tested the zero-power memory retention. :-)


At 02:58 PM 2/14/97 -0600, you wrote:
{Quote hidden}

Thanks.


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1997\02\14@162301 by Antti Lukats

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At 02:58 PM 14/2/97 -0600, you wrote:
>        I am planning to build a PIC project using ISD2500 chips as a
>temporary audio storage buffer.  Since the technology is a specialized form
>of EROM, does anybody know if they have a finite number of reuse cycles?
>Since my project might easily cause one of the devices to go through 20
>to 30 record and play cycles a day, a reuse limit of a few hundred cycles
>such as we have in flash ROM's might make me rethink the whole design.  The
>longer the record time, the smaller the number of reuse cycles, but the whole
>idea is to reduce the amount of mechanical activity on an attached tape
>recorder.

the re-use is practically un-limited as ISD device store the voice as
analog sample not in digital form, those small errors will not cause
any problems at all. in case of digital re-cording even one bit errors
would cause bad noise problems.

so dont be worried :)

antti





-- Silicon Studio Ltd.
-- http://www.sistudio.com

1997\02\14@170434 by Martin McCormick

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       Thanks for the quick responses.  It sounds like I am on the right
track.

Martin McCormick

1997\02\14@184731 by slm5g

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Martin,
       My ISD databook says that the ISD2500 has a 100-year message retention
with 100,000 record cycles.

Ken Dougal

Martin McCormick wrote:
{Quote hidden}

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