I am trying to ID this IC so I can repair this circuit board. The IC is intact in the picture but it now has some leads missing. The circuit is from a Clarion marine radio external remote. The remote is wired not wireless. The remote model is CMRC3D. It is now removed from the board and is supposed to go where it is labeled U2. I included a very crude schematic of what I traced out so far. Looks like GND is on pin 1 and power is pin 20. Your help would be appreciated. Thank you.
Ryan