power if the level of a signal at the input is constant?
The output state on power up depends on the state of the inputs, enable and
VDDI, VDDO. The default state is described in table 10 on page 15 of the
There is also a watchdog timer on the chip.If the decoder receives no pulses
for more than about 5 µs,the input side is assumed to be unpowered or
nonfunctional, in which case the isolator output is forced to a default state
(see Table 10 )by the watchdog timer circuit.