What this reset IC does and where it fits
The ADM1817-R22AKS-RL from Analog Devices is a simple reset/power-on reset IC that monitors a single supply voltage and holds the reset line active high for a minimum of 100 ms after the supply rises above the threshold. The push-pull, totem-pole output drives the reset input of an MCU, FPGA, or SoC directly — no external pull-up resistor needed. This part is built for the SC-70-3 (SOT-323) surface-mount footprint, which fits tight PCB layouts in industrial controllers, embedded systems, and portable equipment where board space is at a premium.
Active-high reset — what it means for your processor choice
This IC asserts a logic high on the reset output when the monitored voltage drops below the threshold. Not every processor expects an active-high reset — some want a low-going pulse. Check your target MCU or SoC reset polarity before committing the BOM. The push-pull output eliminates the external pull-up resistor, saving one component and one trace on dense boards.
100 ms timeout — standard window for most power-on sequences
The 100 ms minimum reset timeout allows the power rail and oscillator to stabilise before the processor starts executing code.
Lifecycle and sourcing
The ADM1817-R22AKS-RL carries an active product status with ROHS3 compliance, so there is no last-time-buy or obsolescence pressure for current designs.