The ADuM144x family contains a glitch filter to reject narrow pulses at the input. The glitch filter width is dependent on the input supply value, and ranges from 100 us at 2.3V to 50 us at 3.6V. Refer to the data sheet for a typical characteristic curve.
For more information on the ADuM144x family of low power digital isolators, please visit: www.analog.com/ADuM144x