76477. I still have one on a board around here somewhere.

https://en.wikipedia.org/wiki/Texas_Instruments_SN76477

I'm thinking of these ICs: https://www.reddit.com/r/AskElectronics/comments/a8af60/can_...

One of the more famous toys using it (in blob form) is the Executor/Echo Keyller keychain: https://youtu.be/20W6AJuMjEk