The TPS3435 also utilizes a programmable output assert delay, using a precision current source to charge an external capacitor upon device startup. By monitoring the voltage on the CRST pin, the TPS3435 can be programmed to have a desired output assert delay. The typical delay time resulting from a given external capacitance on the CRST pin can be calculated by Equation 3, where t_WDO is the output assert delay time in seconds and C_CRST is the capacitance in microfarads.

Note that in order to minimize the difference between the calculated output assert delay time and the actual output assert delay time, use a high-quality ceramic dielectric COG, X5R, or X7R capacitor and minimize parasitic board capacitance around this pin. Table 9-1 lists the output assert delay time ideal capacitor values for C_CRST.