Remote Control

How do I test this component
Can I replace this Chip

General Description
The HT6221/HT6222 are CMOS LSI encoders designed
for use in remote control systems. They are capable of
encoding 16-bit address codes and 8-bit data codes.
Each address/data input can be set to one of the two logic
states, 0 and 1.

Download the datasheet and see if they do what it says - if not, see if you can source a replacement.