The Maxim Integrated MAX12931FASA+ is a 2-channel, unidirectional digital isolator using capacitive coupling to pass signals across a 3000 Vrms isolation barrier. It handles data rates up to 150 Mbps with propagation delays of 9.2 ns typical and pulse-width distortion under 2 ns.
The 150 Mbps data rate is the headline number — it tells you this part can keep up with fast serial buses without adding jitter. The 9.2 ns propagation delay and 2 ns pulse-width distortion leave enough timing budget for the rest of the signal chain.