Dual-voltage monitoring for processor supervision
The MAX6387XS29D3+T is a multi-voltage supervisor from Analog Devices that monitors two supply rails and asserts a reset output when either falls below its threshold. The primary threshold is set at 2.93 V, with a second adjustable input for the auxiliary rail — a common topology for supervising both the core and I/O voltages of an MCU or SoC. The reset output is active-low, push-pull, totem-pole — no external pull-up resistor needed on the RST line. The reset timeout is a minimum of 140 ms, long enough to let the system power supplies and oscillator settle before the processor starts executing code.
Temperature grade and board-fit
The SC-70-4 package (SC-82A, SOT-343 equivalent) is a 4-pin footprint with 0.65 mm pitch; it fits alongside passives in a dense mixed-signal layout without consuming board area. The supply voltage for the supervisor itself is implicit in the adjustable threshold input — the part runs from the monitored rail and draws microamp-level quiescent current, so it can be placed on the same net as the processor core supply without a separate bias rail.