16-Bit I²C/SMBus GPIO Expander

  • 1.65V to 3.6V operating voltage
  • 16 General Purpose I/Os (GPIOs)
  • 5V tolerant inputs
  • Maximum stand-by current of 1uA at +1.8V
  • I²C/SMBus bus interface
    • I²C clock frequency up to 400kHz
    • Noise filter on SDA and SCL inputs
    • Up to 32 I²C Slave Addresses
  • Individually programmable inputs
    • Internal pull-up resistors
    • Polarity inversion
    • Individual interrupt enable
    • Rising edge and/or Falling edge interrupt
    • Input filter
  • Individually programmable outputs
    • Output Level Control
    • Output Three-State Control
  • Open-drain active low interrupt output
  • Pin and software compatible with PCA9535, TCA9535, MAX7312 (XRA1201)
  • 3kV HBM ESD protection per JESD22-A114F
  • 200mA latch-up performance per JESD78B

  • Personal Digital Assistants (PDA)
  • Cellular Phones/Data Devices
  • Battery-Operated Devices
  • Global Positioning System (GPS)
  • Bluetooth

The XRA1201 is a 16-bit GPIO expander with an I2C/SMBus interface. After power-up, the XRA1201 has internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled.

In addition, the GPIOs on the XRA1201 can individually be controlled and configured. As outputs, the GPIOs can be outputs that are high, low or in three-state mode. The three-state mode feature is useful for applications where the power is removed from the remote devices, but they may still be connected to the GPIO expander.

As inputs, the internal pull-up resistors can be enabled or disabled and the input polarity can be inverted. The interrupt can be programmed for different behaviors. The interrupts can be programmed to generate an interrupt on the rising edge, falling edge or on both edges. The interrupt can be cleared if the input changes back to its original state or by reading the current state of the inputs.

The XRA1201 are enhanced versions of other 16-bit GPIO expanders with an I2C/SMBus interface. The XRA1201 is pin and software compatible with the PCA9535, TCA9535 and MAX7312.

The XRA1201 are available in 24-pin QFN and 24-pin TSSOP packages.

For technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.

Part NumberPkg CodeRoHSNo. of
Temperature Range
StatusBuy NowOrder Samples
XRA1201IG24-0A-EBBoard   Active
XRA1201IG24-FTSSOP24TSSOP2416-40°C to +85°CActive
XRA1201IG24TR-FTSSOP24TSSOP2416-40°C to +85°CActive
XRA1201IL24-0A-EBBoard   Active
XRA1201IL24-FQFN24QFN2416-40°C to +85°CActive
XRA1201IL24TR-FQFN24QFN2416-40°C to +85°CActive

Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs. 
CPU InterfaceI2C
No. of GPIOs16
Interrupt Output PinYes
5V Tol InputsYes
Sup V1.65V - 3.6V
Package TypeQFN-24, TSSOP-24
Technical Assets
Product Change Notification