Dual-voltage supervisor in a tiny SC-70-4
The MAX6388XS46D3+ is a power supply monitor from Analog Devices that tracks two separate voltage rails and asserts an active-high reset when either drops below its threshold — the primary channel is fixed at 4.63 V, the second is adjustable via external resistors. Housed in a 4-lead SC-70-4 (SC-82A) package, it occupies minimal board area and suits compact designs where a single supervisor must watch both a 5 V rail and a secondary supply.
140 ms minimum reset timeout — why it matters
The reset output stays asserted for at least 140 ms after all monitored voltages rise above their thresholds — this guarantees the downstream system (MCU, FPGA) has time to stabilise its power and oscillator before the reset lifts, preventing a brown-out restart.