Determine which version of the TPS3703 best suits the monitored rail (V_MON) and window tolerances found on Table 12-1. The TPS3703 allows overvoltage and undervoltage monitoring for precise voltage supervision of common rails between 0.5 V and 5.0 V. This application calls for very tight monitoring of the rail with only ±5% of variation allowed on the 1.2V core rail. To ensure this requirement is met, the TPS3703 was chosen for its ±4% thresholds. The 3.3V I/O is more flexible and can operate up to 8% variance. Since the TPS3703 comes in various tolerance options, the ±7% thresholds can be chosen for this voltage rail. To calculate the worst-case for V_IT+(OV) and V_IT-(UV), the accuracy must also be taken into account. The worst-case for V_IT+(OV) and V_IT-(UV) can be calculated shown in Equation 8 and Equation 9 respectively:

When the outputs switch to a high impedance state, the rise time of the RESET pin depends on the pull-up resistance and the capacitance on that node. Choose pull-up resistors that satisfy both the downstream timing requirements and the sink current required to have a V_OL low enough for the application; 10 kΩ to 1 MΩ resistors are a good choice for low-capacitive loads.