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MSR1 TXB0108 Max output current — Parallax Forums

MSR1 TXB0108 Max output current

Nico SNico S Posts: 9
edited 2010-02-15 22:53 in Robotics
Hi all,

I would like to know what the Max. output current of a/the single/total TXB0108 output/s is.
Reading the datasheet of the TXB0108 it states:

IOK Output clamp current VO < 0 –50 mA
IO Continuous output current· ±50 mA
Continuous current through VCCA, VCCB, or GND ±100 mA

Does this mean that a single output can be Max. 50 mA and the total of all outputs can be Max. 100 mA ?
(not sure what clamp means also)

TIA,
Nico Schoemaker

Post Edited (Nico S) : 2/15/2010 1:27:14 PM GMT

Comments

  • mugurmugur Posts: 105
    edited 2010-02-15 12:05
    Hi Nico, you think you can edit your post title and change MRS1 to MSR1 (this is the real name) so we can help the search function of the site?
  • rpdbrpdb Posts: 101
    edited 2010-02-15 22:29
    These ARE the Droids you're looking for....
    pdf
    pdf
    txb0108.pdf
    699K
  • rpdbrpdb Posts: 101
    edited 2010-02-15 22:46
    A clamp circuit will regulate and begin to shut down (reduce current) at the max current out. The chips specs infere that the max current through the Vss and Vdd pins should not exceed 100 mA. Although each individual pin may source or sink 50 mA max, with all 8 I/O pins sourcing or sinking 50 mA at the same time that would be 400 mA, well beyond the max Vdd/Vss Imax specs. You must interleave current usage or use only one pin at a time at current values approaching the absolute max ratings.

    Hope that helps....
  • Nico SNico S Posts: 9
    edited 2010-02-15 22:53
    Hi rpdb,

    Thx for your help !
    I wasn't sure if i understood the datasheet corect.

    Best regards,
    Nico Schoemaker.
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