Dual-rail supervisor for mixed-voltage boards
The Texas Instruments TPS3306-20DGKG4 is a multi-voltage supervisor that monitors two supply rails simultaneously — one at 1.85V and the other at 2.92V — with a single active-low, open-drain reset output. The 70ms minimum reset timeout keeps the downstream processor in reset long enough for both rails to settle after a power-up or brown-out event.
Voltage thresholds and reset timing
The two monitored thresholds — 1.85V and 2.92V — are fixed, not adjustable, so the TPS3306-20DGKG4 suits designs where those exact trip points align with the nominal rail voltages. The reset output is open-drain, active-low, which lets it pull down the reset line of multiple devices on the same bus without contention.
The TPS3306-20DGKG4 is listed as obsolete. For BOM lines that still call out this exact MPN, the only supply path is through independent distribution — surplus inventory, new-old-stock, or broker-sourced material.