S29GL064N with VIO left open (not tied to the 3.3V)

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user_4077216
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Hi everybody,

I have an interesting case where a TSOP56 case S29GL064N (Spansion/ Cypress) was found to have Pin29 left open (not brazed on the PWB).

Pin 29 is "VIO" that powers the I/O buffers of the Flash memory.

The memory has pull-ups (3K32) on signals #BYTE (Pin 53) and I/O buffers (DQ0-DQ15) tied to the 3.3v power supply.

The Memory works fine even with VIO open circuit but found to fail at hot temperature (+85°C).

I Wonder why the Flash is working with the VIO left open and not tied to the 3.3V, except if the I/O buffers could be powered in some way through the pull-ups, and in this case a configuration where the I/Os are not meeting high speed transfer reducing  drawn current from the 3.3V by the pull-ups that  would maintain the I/Os at correct logic level...

Do you guys have any idea or experience on how the I/O buffers could be powered in my case  (pull-ups on I/Os, pull-up on #BYTE, other, ...)?

Many thanks,

Pascal

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PradiptaB_11
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500 replies posted 250 solutions authored 250 replies posted

Hi Pascal,

We think the current is supplied by the pull ups.

Thanks,

Pradipta.

View solution in original post

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PradiptaB_11
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500 replies posted 250 solutions authored 250 replies posted

Hi Pascal,

We think the current is supplied by the pull ups.

Thanks,

Pradipta.

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Hi Pradipta,

Do we have any internal design of these Memories to undestantand how the pull-ups could provide the 3.3V power voltage to the I/O buffers (diodes, etc..) ?

Many thanks,

Pascal-Louis GEYRE

FADEC Technical Leader

Safran Electronics & Defense

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Hi Pascal,

We cannot share internal designs on the public forum due as they are confidential. You need to have an NDA also with Cypress so that we can share these files.

Thanks,

Pradipta.

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