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I2C IO expander

pragash sangaran78
Genius 3510 points
Other Parts Discussed in Thread: TCA6416A, TCA6418E, TCA6408A

i need I2C IO expander for my design. the design is low power, smaller size wearable so the part must be a smaller size, consume low power and also lower cost.

  • 0
    TI__Guru 73201 points
    Hey pragash,

    How many I/O pins do you need?
    -------------------------------------------------------------------------
    Here is a list I made looking at size:

    TCA6416A (3mm x 3mm)
    TCA6418E (~2mm x ~2mm)
    TCA7408A (2mm x 2mm)
    TCA6408A (2.6mm x 1.8mm)

    In terms of cost I see TCA6408A seems to be the best positioned at 1k unit pricing. Also seems to have around 1 uA of current in standby and around 6.5uA in operating (dependent on Vcc and other parameters).

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    Genius 3510 points
    dear bobby,
    8 I/O is good for me. thanks for the suggestion.