Apply 5V logic signal to CPLD not a good idea!

The Wiring Pi clock utility seems not stable.  So I tried to use an external crystal clock.  I thought the crystal of 5V logic level should be acceptable by the CPLD.  The clock signal is heavily distorted when applied to the 3V3 CPLD.  And I found the CPLD seems getting burnt.  I replace by a new one but found it not writable.  So I lost another RMB12.

I also broke the RMB0.7 socket, because I was not too careful and I don't have any proper tool to remove the chip.