I'm looking at 2 different optocouplers.The Avaago ACPL-K44T and the ACPL-227.
The ACPL-K43T states that it's a digital opto-coupler while Avago ACPL-227 doesn't.
Schematically, they're a bit different. The K43T needs a Vcc and has parameters like Vol,Voh,Ioh,Iol, etc.
I'm wondering what exactly are the applications you'd need the K44T for compared to the 227.
http://www.avagotech.com/products/optocouplers/automotive/ipm-interfaces/acpl-k43t-000e