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PCF8575C: Can PCF8575CRGER be Supplied with Vcc=+3.3V?

Joel Hayashida
Prodigy 10 points

Part Number: PCF8575C
Other Parts Discussed in Thread: PCF8575, , TCA9535

We would like to use exact TI PN PCF8575CRGER and interface with LVCMOS33 and supply it with VCC=+3.3V

Here is the TI product page and here is the exact PN we have designed into our product: PCF8575CRGER
www.ti.com/.../PCF8575C

The datasheet is the version froom January 2015 which I got from the TI product page.
 

The datasheet clearly states that Vcc(min) is 4.5V…
 

The pin and package compatible PCF8575 TI part shows that it can be supplied off of Vcc=+3.3V and down to +2.5V.
 

The following Google search with AI-enabled states that for the PCF8575C that supplying the PCF8575C with +3.3V is generally supported: Google AI Search

Another piece of evidence is that the PCF8575 we have on our hardware design is operating as expected with Vcc = +3.3V and LVCMOS levels.

So can you let us know if the PCF8575C also can be supplied with Vcc=+3.3V and that LVCMOS33 logic levels will work?

Is there a forthcoming datasheet update that will state the +3.3V support?

BTW, here is another Google AI search that states the same thing:  Another_Google_AI_Search

We really require the PCF8575C because it initializes in tri-state after the supply is valid versus the PCF8575, which initializes HIGH after device power on reset.

Thank you for your TI support in advance.
Joel

  • 0
    TI__Guru 58511 points

    Hi Hayashida-san,

    We will follow up shortly on this query. 

    Regards,

    Jack

  • 0
    TI__Guru 62398 points

    Hi Joel,

    The PCF8575C is rated for VCC(min) = 4.5V. I don't see anything in the datasheet suggesting it can be used at 3.3V. 

    For 3.3V range, we would need to switch to PCF8575. 

    Would TCA9535RGER work as an alternative p2p drop in? It is the same exact pinout and package type. The I/O's of the TCA9535 power-on as high-z cmos inputs. These pins will float, so an external pull-up resistor is needed. 

    We also have the TCA9555RGER which is the same device as TCA9535RGER, but 9555 has internal 100k PU resistors on each I/O. 

    Regards,

    Tyler