What this 4-digit counter does on the board
The ICM7217AIJI is a 4-digit LED presettable up/down counter in a DIP-24 package, designed to drive common-cathode LED displays directly without external digit drivers.
Supplied in bulk, the DIP-24 footprint occupies a standard 0.600-inch row spacing — a through-hole layout that suits prototyping, rework, and low-volume production without the thermal profile concerns of SMD packages.