Identify a part

[ColinA]

The boards I got these from were only using 6 of the 18 pins so I know what those do but would like to know what the other 12 pins do. They are a self contained clock with a programmable alarm, drop power and they go dumb.

I found nothing on the web. The writing on the back is as follows:
DQ463-5
NO(0)
jewels
CS3525