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LSF0108: drive optocoupler

Part Number: LSF0108

Hi Team,

I have connected the device as followed and I want to translate 1.8V to 5V in order to drive optocoupler using LSF0108 device. 

The '0' works perfect but can't get '5V' and output side B. get 1.8V instead of 5V.

As result the optocoupler is always in "on" state while I need it at "off" state when the A2 is at 1.8V output.  

Please can you advise back?

Thanks in advance

Shai