AD976A timing error,but data is right?

I use the AD976A in the first mode of datasheet. AD976A CS is tied to GND,it is always low.Then R/C becomes low in 4.5us,then it becomes high in 4.5us,it's cycle is 9us.

but I read the data at the 4us after R/C becomes low. As the datasheet said, the data is Hi-Z when R/C is low.

Why AD976A can output the right data?