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© 2009 Microchip Technology Inc. DS22121B-page 1
MCP23009/MCP23S09
Features
• 8-bit remote bidirectional I/O port:
- I/O pins default to input
• Open-drain outputs:
-5.5V tolerant
- 25 mA sink capable (per pin)
- 200 mA total
• High-speed I
2
C™ interface: (MCP23009)
- 100 kHz
- 400 kHz
-3.4MHz
• High-speed SPI interface: (MCP23S09)
-10MHz
• Single hardware address pin: (MCP23009)
- 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
• Low standby current:
- 1 µA (-40°C ≤ T
A ≤ +85°C)
- 6 µA (+85°C ≤ T
A ≤ +125°C)
• Operating voltage:
- 1.8V to 5.5V
Packages
16-pin QFN (3x3 [mm])
18-pin PDIP (300 mil)
18-pin SOIC (300 mil)
20-pin SSOP
Block Diagram
GP0
GP1
GP2
GP3
GP4
GP5
GP6
GP7
I
2
C
Control
GPIO
SCL
SDA
RESET
INT
8
Configuration/
8
Control
Registers
SPI
SI
SO
SCK
CS
MCP23S09
ADDR
Serializer/
Deserializer
Multi-bit
Decode
MCP23009
8-Bit I/O Expander with Open-Drain Outputs
