MCP23009 DataSheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gif8-Bit I/O Expander with Open-Drain OutputsMCP23009 is an 8-bit I/O expander with I2C™Compatible interface operating at speeds of up to 3.4MHz. The MCP23009 is available in 18-pin PDIP (300 mil), 18-pin SOIC (300 mil) and 20-pin SSOP packages.
Parameter NameValue
Device Description8-bit I/O Port Expander
Operating Voltage Range (V)1.8 to 5.5
Operating Temp Range (°C)-40 to 125
InterfaceI²C™
Max. Bus Frequency (kBits/s)3400
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 I2C™ interface: 100 kHz, 400 kHz,3.4MHz
Single hardware address pin: Voltage input to allow up to eight devices on the bus
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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