Need more microcontroller pins for new features? Want to stay with a low pin-count microcontroller rather than switching to a more expensive one? Microchip’s new UNI/O™ serial EEPROM uses only one connection to the host microcontroller. This compares to two or three pins for I2C™ and three to six pins for Microwire or SPI buses. This new, proprietary bus offers advanced features like a status register and write protection on demand, along with all I/O, memory array and command functions through a single pin. This device has a unique device address (0xA1) to help connect 2 UNI/O EEPROMs on the same bus.

• Single I/O Interface
• 16 Kbit Memory Densities
• 1.8-5.5V Operating Voltage
• 10-100 kHz Operating Frequency
• 1 Million Erase/Write Cycles
• Software Write Protect: ¼, ½, or Full Array
• Status Register
• Set/Erase entire memory with a single command
• ESD Protection > 4kV
• Unique device address (0xA1) to connect 2 UNI/O EEPROMs on the same bus.