4.65V threshold supervisor in 8-SOIC — active production, second-source ready
The STM819LM6F is a simple reset/power-on reset supervisor monitoring a single voltage rail with a 4.65V threshold. When the monitored supply drops below that threshold, the active-low reset output (push-pull, totem pole) asserts and holds for a minimum of 140ms after the supply recovers — long enough for a downstream MCU or DSP to complete its internal power-up sequence before the reset is released.
Reset timing and output drive — what the ratings mean for the BOM
A shorter timeout risks a brown-out reset re-triggering before the core is ready; a longer one delays the boot sequence unnecessarily. The push-pull output eliminates the need for an external pull-up resistor — it sources and sinks current directly, driving the reset line of a CMOS MCU without extra components. Active-low polarity matches the majority of microcontroller reset inputs, so no inversion logic is required. Monitoring a single voltage at 4.65V threshold suits 5V-supply systems where the supervisor must assert reset before the supply drops below the minimum operating voltage of the processor.