The RT9818 is a micro-power voltage detector from Richtek that supervises the power supply voltage level for microprocessors (μP) or digital systems. It provides internally fixed threshold levels ranging from 1.2V to 5V with 0.1V per step, which covers most digital applications. It features low supply current of 3μA. The RT9818 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Once VDD recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. RT9818 is provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and SOT-89 packages.
The RT9818 is a micro‑power voltage detector designed to supervise power‑supply voltage levels for microprocessors and digital systems. It provides internally fixed threshold levels from 1.2 V to 5 V in 0.1 V steps and features a low supply current of 3 A. The device includes an open‑drain reset output and offers several built‑in recovery delay options.
The datasheet lists package options (SC‑82, SC‑70‑3, SOT‑23‑3, SOT‑23‑5, SOT‑89), absolute maximum ratings, recommended operating conditions, electrical characteristics, and typical application circuits. Detailed pin configurations, dimensions, and temperature‑dependent reset timing curves are also provided.
| Threshold Voltage Range | 1.2 V to 5 V (0.1 V step) |
|---|---|
| Supply Current | 3 A |
| Operating Voltage Range (Vpp) | 0.9 V to 6 V |
| Package Types | SC‑82, SC‑70‑3, SOT‑23‑3, SOT‑23‑5, SOT‑89 |
The RT9818 draws a low supply current of 3 A.
The device is offered in SC‑82, SC‑70‑3, SOT‑23‑3, SOT‑23‑5, and SOT‑89 packages.
The detector provides fixed thresholds from 1.2 V to 5 V in 0.1 V steps.
The RT9818 operates with Vpp from 0.9 V up to 6 V.