About GD75232 question

ShuCheng,


There is no under voltage lock out in GD75232. During power up the outputs will change based on the supply sequencing.
The recommended power sequence prevents high supply current but doesn't ensure output states during the process.

Hi Ron,

Thanks for your reply,

We have try GD75232, TRS3243E, both have same phenomenon.

Actually we couldn't find power seq description at datasheet. 

Did you know how to setting? or do we have others solution can include voltage lock out this function?

P.S. We have try competitor ADI, looks the issue can fix. But we prefer still use TI solution. 

Shu-Cheng,

Be sure that FORCEOFF pin is at [not VCC] {ground} level during power up to keep the outputs of TRS3243E turned off.

Correction

Hi Ron,
Thanks for your reply.
"Be sure that FORCEOFF pin is at VCC level during power up to keep the outputs of TRS3243E turned off." is means TRS3243E include under voltage lock out this function??
The ADI parts is ADM213LE, Looks TI have TRS213 can replace. So TRS213 could cover this issue?
If couldn't, Do we have suitable solution and P2P GD75232??
Many thanks for always quick reply.

Shu cheng,

I meant to say FORCEOFF pin low, forceoff pin is active low to keep outputs off.

TRS213 can also be used. In this case SHDN pin low does the same thing.

Hi Ron,

Thanks for your reply.

Customer have use TRS3243EIRHBR to replace ISL4241E
Could you help double confirm TRS3243E can direct to replace ISL4241E at same schematic?

How could we avoid the risk that "when power on, there have high level as soon"
Thanks for your kindly reply.

Shu-Cheng,

The DIN inputs must be high (same as VCC) during power up to prevent DOUT from going high.
Pin 22 is an active low receiver enable on 3241, it is a active high FORCEON pin on 3243.

Have you seen TRS3243E go high on power up with a high DIN signal?