Остается прозвонить пины VCCIO на предмет отсутствия связи между ними
А кактус просто пишет, что разбивка разновольтного VCCIO на разные банки ему непонятна, и для этого семейства недоступна.

---------- Post added at 12:07 ---------- Previous post was at 12:06 ----------

Вот еще строки из даташита для MAX7000, но там опять нету прямого ответа:
"MultiVolt I/O Interface
MAX 7000 devices—except 44-pin devices—support the MultiVolt I/O
interface feature, which allows MAX 7000 devices to interface with
systems that have differing supply voltages. The 5.0-V devices in all
packages can be set for 3.3-V or 5.0-V I/O pin operation. These devices
have one set of VCC pins for internal operation and input buffers (VCCINT),
and another set for I/O output drivers (VCCIO).
The VCCINT pins must always be connected to a 5.0-V power supply. With
a 5.0-V VCCINT level, input voltage thresholds are at TTL levels, and are
therefore compatible with both 3.3-V and 5.0-V inputs.
The VCCIO pins can be connected to either a 3.3-V or a 5.0-V power supply,
depending on the output requirements. When the VCCIO pins are
connected to a 5.0-V supply, the output levels are compatible with 5.0-V
systems. When VCCIO is connected to a 3.3-V supply, the output high is
3.3 V and is therefore compatible with 3.3-V or 5.0-V systems. Devices
operating with VCCIO levels lower than 4.75 V incur a nominally greater
timing delay of tOD2 instead of tOD1."