• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 585 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCA9509: Differecne between TCA9509 and TCA9517A

Saki
Intellectual 890 points
Part Number: TCA9509
Other Parts Discussed in Thread: TCA9517A,

Hello

Let me ask about the difference between TCA9509 and TCA9517A.

I think one of bigget difference is VCCA supply voltage. 

Is VCCA [V] for TCA9509 always less than VCCB[V], right  ?

Is there any other difference ?

I read both datasheet but it didn't be seemed to mention about it.

In the comparison table in attachment that I got through web,

TCA9509 has Power Save Mode function.

What is the Power Save Mode in TCA9509 ? and TCA9517A doesn't have it, right ?parameter-data.xls

Best Regards,

Saki

  • 0
    TI__Genius 16560 points

    Orio-san,

    You are mostly correct. Power supply requirements is the biggest difference. With TCA9517A, there is no requirement of VCCA < VCCB. So you may have VCCA = VCCB, or VCCA >VCCB if you wish. The TCA9509 does NOT support this. There is a strict requirement that VCCA < VCCB - 1.

    The other significant difference between the two devices is that the TCA9509 has a build in 1 mA current source on the A-side. The TCA9517A does not. What this means is that for the TCA9509, you cannot connect multiple TCA9509 A-sides together, but it is ok to connect B-sides together. The exact opposite is true of the TCA9517A, you may connect multiple A-sides together, but you cannot connect B-sides together.

    With power savings mode, I am not sure what you mean. Neither device offer a power savings mode. Both do have powered-off high impedance, which will put all pins in a high-z state when 1 or both supply rails are unpowered. I cannot see the table you attached (there is required linked sheet that is not supplied).