Targum zu Schemot 12:40

And the days of the dwelling of the sons of Israel in Mizraim were thirty weeks of years, (thirty times seven years,) which is the sum of two hundred and ten years. But the number of four hundred and thirty years (had passed away since) the Lord spake to Abraham, in the hour that He spake with him on the fifteenth of Nisan, between the divided parts, until the day that they went out of Mizraim.