Renesas, CS82C54-10Z, Logic, Timing Solutions Clocks

 Renesas CS82C54-10Z in Tube. CS82C54 Series 10 MHz 4.5 - 5.5 V Programmable Timer - PLCC-28.

https://www.futureelectronics.com/p/semiconductors--logic--timing-solutions--clocks/cs82c54-10z-renesas-5028265