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TPS53313 synchronization:

Other Parts Discussed in Thread: TPS53313

The data sheet (pg 12) states:

The clock frequency is programmed by the value of the resistor connected from the RT/SYNC pin to GND. The

switching frequency is programmable between 250 kHz and 1.5 MHz.

Also, TPS53313 is able to synchronize to external clock. The synchronization is fulfilled by connecting the

RT/SYNC pin to external clock source. If no external pulse is received from RT/SYNC pin, the device continues

to operate the internal clock.

Question:

What happens if the SYNC clock starts, runs for a while, and than stops? Will the device continue to operate at the internal clock based on the value of the resistor or will it drop to a low switching value?