MCP23018/MCP23S18
16-Bit I/O Expander with Open-Drain Outputs
Features
• 16-bit remote bidirectional I/O port:
- I/O pins default to input
• Open-drain outputs:
- 5.5V tolerant
- 25 mA sink capable (per pin)
- 400 mA total
• High-speed I2C™ interface: (MCP23018)
- 100 kHz
- 400 kHz
- 3.4 MHz
• High-speed SPI interface: (MCP23S18)
- 10 MHz: 2.7V ≤ VDD ≤ 5.5V
• Single hardware address pin: (MCP23018)
- Voltage input to allow up to eight devices on
the bus
• Configurable interrupt output pins:
- Configurable as active-high, active-low or
open-drain
Block Diagram
• 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 ≤ TA ≤ +85°C)
- 6 µA (+85°C ≤ TA ≤ +125°C)
• Operating voltage:
- 1.8V to 5.5V
Packages
28-pin PDIP (300 mil)
28-pin SOIC (300 mil)
24-pin SSOP (MCP23018 only)
24-pin QFN (4x4 [mm])
CS
SCK
SI
SO
MCP23S18
SPI
SCL
SDA
MCP23018
I2C
Serializer/
Deserializer
www.DataSheet4U.com
ADDR
RESET
INTA
INTB
Multi-bit
Decode
Interrupt
Logic
Control
8
Configuration/
Control
Registers
Open-drain
GPIO
16
GPIO
GPB7
GPB6
GPB5
GPB4
GPB3
GPB2
GPB1
GPB0
GPA7
GPA6
GPA5
GPA4
GPA3
GPA2
GPA1
GPA0
© 2008 Microchip Technology Inc.
DS22103A-page 1
