TPS3851: VIL condition of MR pin?

Sam Lee,

There are slight differences between the EC table specs and the Figure 4 typical curve. Let me explain:

The EC table states the /MR threshold to detect a "low" is 0.25V or less. This is for when VDD is between (V_INT + V_HYST) and (recommended max voltage). V_INT can either be -4% or -7% lower than the nominal threshold depending on the device nomenclature of the specific device. See Table 5 in Section 11.1.1 for device nomenclature. Let's assume they are using the "G" version which correlates to V_ITN = -4%. This means the EC table applies for conditions when Vdd is between 1.8V - 4% and 6.5V for TPS3851-1.8 or between 2.5V - 4% and 6.5V for TPS3851-2.5 or between 3.0V - 4% and 6.5V for TPS3851-3.0 etc and this applies across temp.

The typical curve in Figure 4 shows the /MR threshold when the device is operating at the lowest allowed VDD = 1.6V. This curve just shows how at one specifc VDD, how the /MR threshold can change over temp. Typical curves are just to provide customers/users with additional information but is not a guarantee. We only guarantee the specs in the EC table.

I hope this clears up any confusion. Let me know if you need anything else!

-Michael