PCF8574 I2C Port Expander I/O Extension 8 Pin

If you need more I/O pins then this PCF8574 port expander is the perfect solution. The PCF8574 can easily be used on a Raspberry Pi or Arduino. With this handy breakout board, you can quickly build a circuit with Dupont jumper cables. The PCF8574 is controlled via the I2C bus, which also keeps the wiring effort low. The PCF8574 breakout board is designed so that several can be connected in series. In order for the microcontroller to be able to control each PCF8574 individually, they must be addressed. A maximum of eight different addresses can be assigned. So you could expand your I/O by a maximum of 64. However, it should be noted that the inputs and outputs are not super fast, but they are perfectly adequate for buttons and LEDs.

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Downloads:

PCF8574 Datasheet

Technical Details:

• Chip: PCF8574AT 
  
• Operating voltage: 3.3 to 5V
  
• Inputs/Outputs: 8
  
• Interrupt Pin: 1
  
• Grid Dimension: RM2.54
  
• Interface: I2C
  
• Addressing: 8 different addresses
  
• Standard Address: 0x38
  
• Size: 54 x 15 x 12mm
  
• Weight: 5g
  

Package includes: 

1x PCF8574 I2C Port Expander I/O Extension 8 Pin