GENERAL DESCRIPTION
The SX1501, SX1502 and SX1503 are complete ultra low voltage General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. They allow easy serial expansion of I/O through a standard I2C interface. GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous.

KEY PRODUCT FEATURES
• 4/8/16 channel of I/Os
    ◾ True bi-directional style I/O
    ◾ Programmable Pull-up/Pull-down
    ◾ Push/Pull outputs
• 1.2V to 5.5V independent operating voltage for all supply rails (VDDM, VCC1, VCC2)
• 5.5V compatible I/Os, up to 24mA output sink (no total sink current limit)
• Fully programmable logic functions (PLD)
• 400kHz 2-wire I2C compatible slave interface
• Open drain active low interrupt output (NINT)
    ◾ Bit maskable
    ◾ Programmable edge sensitivity
• Power-On Reset and reset input (NRESET)
• Ultra low current consumption of typ. 1uA
• -40°C to +85°C operating temperature range
• Ultra-Thin 3x3mm QFN-UT-20 and TSSOP-20 packages (SX1501/SX1502)
• Ultra-Thin 4x4mm QFN-UT-28 and TSSOP-28 packages (SX1503)

TYPICAL APPLICATIONS
• Cell phones, PDAs, MP3 players
• Digital camera
• Portable multimedia player
• Notebooks
• GPS Units
• Industrial, ATE
• Any battery powered equipment