Latchup-proof I/O circuit implementation

摘要

An arrangement that prevents triggering of latchup in internal circuits by input/output buffers on an integrated circuit chip provides a space surrounding each active device connected to a bond pad. A ring well surrounds the space and separates the active device from the internal circuits of the chip. The ring well serves as a collector to prevent triggering latchup by the active device of the internal circuits located outside the ring well.