We are currently using your 5M1270ZT144A5 chip, but it is currently sold out worldwide. We have been able to find the alternative 5M570ZT144A5 but this has come with a two questions/problems: - Desp...
From our assessment, two GND pins which left floating should not impact the functionality of the device. However, please bear in mind this is not guaranteed by Intel as it does not follows the recommendation.
There are possibility for the signal performance degraded and noises may be increase as well which may have a big impact for high speed signal.
This information also might be useful for this issue: Migration Pinout
Thanks for the quick response. I had not seen the reply, as the notification email had gone into the spam folder.
I have compared side by side these two documents:
- "Pin Information for the MAX® V 5M570Z Device - PDF Format "
- "Pin Information for the MAX® V 5M1270Z Device - PDF Format "
In particular for the package T144 which is the one we use. If I compare side by side the gnd and power pins of the two CPLDs I get this:
Most pins are the same but 2 pins have changed. Pin 11 and 78 are ground in the 1270Z, but they are IOs in the 570Z. This doesn't cause us any problem, as those pins in our design would be connected to ground, thus driven as inputs. The problem is for the pins 8 and 137, which in the 1270Z are just IOs, but if we move to use the 570Z, they become grounds (thus should be connected to ground). In our PCB pin 137 is unconnected, and there is not good way to connect it to ground so we would have to leave this ground pin unconnected. Is this ok? Pin 8 is currently connected to drive an LED in our design, but we could, if necessary, replace the LED with a 0Ohm resistor so that pin would also be connected to ground as per pinout. This would mean a small change on the PCB but doable (not like the other pin). Do you recommend us to do this? If we didn't, that would mean that we would be running the 570Z, with, effectively, 2 ground pins unconnected. Would this, somehow, interfere with the normal operation of the CPLD?
Regarding the second part. We have just received the part from this Chinese supplier and as it turns out it wasn't 5M570ZT144A5 as expected but rather 5M570ZT144C5. Could you confirm that the only automotive version of the MAXV CPLDs is for the 1270Z part? The automotive rating is important for us. I guess you can't point us to anywhere we can source the 5M1270ZT144A5 part right?
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