EF6821P Parallel I/O Interface Adapter For Controller Boards

EF6821P is used when a design needs additional parallel I/O under simple, register-based control. It fits legacy controller boards, industrial instruments, and service spares where the original architecture depends on a dedicated interface IC rather than bit-banged GPIO. EF6821P provides structured port access and control signaling so firmware can read inputs, drive outputs, and respond to state changes in a predictable way. It is typically integrated with the host bus and external buffering as needed for the connected loads. Use EF6821P to keep established hardware and firmware behavior aligned while maintaining a clean I/O boundary. Request a quote for EF6821P.