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   8-Bit I/O Expander with Open-Drain Outputs  
 
  
MCP23S09 is an 8-bit I/O expander with SPI interface operating at 10 MHz. The MCP23S09 is available in 18-pin PDIP (300 mil), 18-pin SOIC (300 mil) and 16-pin 3x3mm QFN package  
    
  
 Parameter Name  Value  
 Device Description  8-bit I/O Port Expander  
 Operating Voltage Range (V)  1.8 to 5.5  
 Operating Temp Range (°C)  -40 to 125  
 Interface  SPI  
 Max. Bus Frequency (kBits/s)  10000  
  
     Features  
 8-bit remote bidirectional I/O port: 
- I/O pins default to input 
 Open-drain outputs: 
- 5.5V tolerant 
- 25 mA sink 
- 200 mA total 
 Low standby current as low as 1 μA 
 High-speed SPI interface at 10 MHz 
 Configurable interrupt output pins: Configurable as active-high, active-low or open-drain 
 Configurable interrupt source: Interrupt-on-change from configured defaults or pin change 
 Polarity inversion register to configure the polarity 
of the input port data 
 External reset input 
 
 
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