LTC4313/LTC4314 with LTC4300-2 and high VOL device.

Hello.

I am currently thinking about using LTC4313/LTC4314 with LTC4300-2 and
non-compliant I2c device that drive a high VOL.
In LTC4313/LTC4314 datasheets , VOL is not defined but VOS(Buffer Offset Voltage) is defined.

example
SDAIN VIL= 0.6[V]
VOS= 0.06[V] (typ) @ VIN=0.2[V]
SDAOUT VOL=VIL+VOS= 0.66[V]??

I think that it cannot work with high VOL.
If this part is not clear,ACC in the LTC4300-2 may cause trouble.

Please tell me about this.

Regards

  • 0
    •  Analog Employees 
    on Dec 5, 2019 8:56 PM over 1 year ago

    Hi denwaku,

    It sound like your understanding of bus buffer operation is correct. The bus buffers will add a Buffer Offset Voltage to the incoming low level, so the output Vol is based on the Vil level on the other side. The allowable Vil level is defined in the datasheet. 

    There is one bus buffer that operates a bit differently. The LTC4308 will offset the vil up in one direction and down in the other direction. If orientated properly it may be a consideration.

    Regards,

    Jason

      

  • Hi jnaso.

    Thank you for suggesting for the LTC4308.

    Unfortunately I could not use LTC4308 because I had to connect the LTC4300-2  to the input side of the LTC4308.

    I will consider the another option.

    Regards