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ADM809 Reset timeout confusion

Hi,

The datasheet provided here -  http://www.analog.com/media/en/technical-documentation/data-sheets/ADM809-5S_-5L.pdf for ADM809 mentions that the Reset timeout is 55ms

While the datasheet provided here -http://www.analog.com/media/en/technical-documentation/data-sheets/ADM803_809_810.pdf mentions the timeout as 240ms (typically).

Why is there so much variation? and is there any ADM809 flavor with 240 ms reset pulse ?