TCA9406: VIH A-port when VCCA is 1.95-2.3V

Kazuki Itoh

Genius 10720 points

Part Number: TCA9406

Hi team,

I found VIH A-port has different specification when VCCA is <1.95V and >2.3V.

Could you let me know the VIH when VCCA is between 1.95 and 2.3V?

Regards,

Itoh

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 316470 points

See [FAQ] What method is best used for estimating specification values between those given in the datasheet?

But this device is used for open-drain signals; the high level is never actively driven but determined by the pull-up resistors, so it is directly at V_CCI, and the minimum V_IH should not really matter.

0 BOBBY over 2 years ago

TI__Guru 72181 points

Hi Itoh,

What you are referencing is the recommended operating conditions. Based on the min values provided, it seems to suggest that the value would be Vcci-0.3V.

As Clemen's pointed out, this device is typically used for open drain type protocols so the pull up resistor on the bus (and internal to the device when enabled) will pull the voltage to Vcc anyways. ViH isn't really used for any type of logic for this device on the A/B ports, only for the enable thresholds so knowing Vih isn't very helpful.

-Bobby

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TCA9406: VIH A-port when VCCA is 1.95-2.3V