Radiation hardened input/output expander with I2C and SPI serial interfaces

An input/output (I/O) expander, comprising:

• a serial interface for communicating with an external controller;
• a configuration and data registers block in communication with the serial interface;
• a logic block in communication with the external controller and the configuration and data registers block;
• and
• a plurality of digital I/O ports in communication with the logic block and the configuration and data registers block, each of the plurality of digital I/O ports configured to send or receive static signals under control by the external controller through the serial interface;
• wherein the input/output I/O expander includes a radiation hardened 32-bit remote I/O port;
• a compact and low-power application specific integrated circuit that converts commands from a serial interface into a parallel bus for miniaturized instrument electronics containing a radiation hardened by a commercial 0.25 μm CMOS process;
• a plurality of enclosed negative-channel metal oxide semiconductor (NMOS) transistors, guard rings and triple voted flip flops;
• a greater 300 krad total ionizing dose and single-event latchup linear energy transfer of 120 MeV/mg/cm2;
• a 2.5-3.3V power supply;
• a pin selectable interface;
• said digital I/O ports where each I/O port is programmable to be one of input and output capable of programmable polarity inversion for outputs;
• programmable interrupt signal when I/O configured as input and interrupt enabled in a leaded chip carrier flatpack package.