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UC1846-SP: 2 questions on use of the SYNC Pin

Part Number: UC1846-SP
Other Parts Discussed in Thread: UC1526

1) When using an external sync, what type of signal is expected?  Will a Square wave of 5V amplitude and 300KHz be sufficient?

2) What happens during start up, when an external sync is not available?  What frequency does the UC1846-SP default to?