Hi Ramesh,
A mixed voltage system does not usually work well together. Most CMOS devices have ESD protection cells that act like a diode connection to the supply. A 5V device output will force current through the ESD cell to the supply if the supply is 3.3V. This can damage the device. This is what you had with the 5V oscillator. If the MAX232 is also running at 5V, then this could also have damaged the MSC1210 running at 3.3V.
The absolute maximum table in the datasheet specifies that a digital input cannot exceed DVDD+0.3V relative to DGND. This means that any input over 3.6V will exceed the absolute maximum ratings for the MSC1210.
If all devices connected to the MSC1210 are operating at 5V, why was the DVDD of the MSC1210 operating at 3.3V?
Best regards,
Bob B