[sdiy] Hitatchi 6116LP-3

[The Old Crow]

On Thu, 25 Oct 2001, Paul Maddox wrote:

> Dear all,
>
>  anyone got a datasheet for this?
> Im trying to swap in some Dallas DS1220-100's in its place (nicad backed
> sram).
> but get the odd crashs now and then (its my PPG 2.2)..
>
>   so I guess the timing isnt quite good enough...
> anyone help?

  I have some DS1220s used for the same purpose on a different machine:
replacing the two 6116s on the GS1 such that I can extract the patch data
(as well as eliminate the external batteries).

  Now, I encountered a problem: since the 1220s I have go into ram protect
mode at Vcc=4.5V (or below), I was getting odd results from the GS1 when
using them in place of the 6116s.  It turns out the -7V to -12V (thats how
they powered the microcontroller board) power supply was actually around a
delta of 4.5V--right where the DS1220s go to sleep.

  It may be you are not getting quite enough voltage to power them in your
2.2.  Is there a diode in the Vcc to your sram sockets?

  I have a 1983 Hitachi memory databook here somewhere..I'll hunt it up
and scan the data for the 6116LP-3.

crow

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