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TUSB4041I: TUSB4041I Bus Contention

Gustaf Falk Olson58
Prodigy 610 points
Part Number: TUSB4041I

Dear To Whom it Might Concern,

I ask this question on behalf of another engineer who intend to use the TUSB4041I. There is one thing in the data sheet that bewilders us: p.14 - 8.3.7 Power-Up and Reset.

 

"The TUSB4041I device does not have specific power-sequencing requirements with respect to the core power

(VDD) or I/O and analog power (VDD33). The core power (VDD) or I/O power (VDD33) can be powered up for an

indefinite period of time while the other is not powered up if all of the following constraints are met:

• Observe all maximum ratings and recommended operating conditions.

• Observe all warnings about exposure to maximum rated and recommended conditions, particularly junction

temperature. These apply to power transitions and normal operation.

• Limit bus contention to 100 hours over the projected lifetime of the device while VDD33 is powered-up.

• Do not exceed the ratings listed in the Absolute Maximum Ratings table for bus contention while VDD33 is

powered-down."

 

In regards to the thirds bullet, what does this sentence signify? What happens after 100hrs?

Thanks in advance,

Gustaf Falk Olson

  • 0
    TI__Mastermind 19720 points
    Bus Contention is when the the TUSB4041's data lines and another device (e.g. MCU) are connected together, where the other device is trying to pull the data lines high and the TUSB4041 is trying to pull the data lanes low. This can happen when the data lane of the device is being held high by another device while Enable to TUSB4041 is held low, then when enable is brought high the TUSB4041 will try to bring the data lines low. If the other device tries to continue to to have the data lane high while the TUSB4041 tries to pull the data lanes low this will cause Bus contention. This contention can cause damage to the output of the TUSB4041 after a total time of 100 hours in contention over the life of the devices operation.