UM823RS

@@ -0,0 +1,45 @@+# UM823RS++**Union Semiconductor** · Supervisor and Reset ICs · SOT-23-5++UM823RS from Union Semiconductor, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | RESET | output | Active-low reset output. Pulses low for 200 ms (typ) when triggered and remains low whenever VCC is below the 2.63 V (typ) reset threshold or when MR is a logic low. Guaranteed valid down to VCC = 1 V. Push-pull output sinks/sources current (VOL ≤ 0.3 V @ 4 mA, VOH ≥ 0.8·VCC @ 1 mA). |+| 2 | GND | power_in | Ground reference for all signals. |+| 3 | MR | input | Active-low manual-reset input. Triggers a reset pulse when pulled below 0.3·VCC. Has an internal 52 kΩ (35-75 kΩ) pull-up to VCC; may be driven from TTL/CMOS logic, shorted to GND with a switch, or left open. Connect to VCC if unused. |+| 4 | WDI | input | Watchdog input. If WDI remains high or low longer than the 1.6 s (typ) watchdog timeout period, the internal watchdog timer expires and a reset is triggered. The watchdog timer clears on any rising or falling edge (min 50 ns pulse) or whenever RESET is asserted. Leaving WDI unconnected or three-stated disables the watchdog function. |+| 5 | VCC | power_in | Supply voltage input. Operating range 1.0 V to 7 V (absolute max 8 V). Typical supply current 3 µA (R/S/T/Y/Z threshold options) with MR and WDI unconnected. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Union Semiconductor |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `UM823RS`+- `UM823RSUM823RP`++## CAD (KiCad official)++- Symbol: `UM823RS`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Union Semiconductor datasheet](docs/um823rs-datasheet.pdf) (11 pp, sha256 `9413e8dcc1f62525`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/um823rs-datasheet.pdf)

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