UM823SS

@@ -0,0 +1,45 @@+# UM823SS++**Union Semiconductor** · Supervisor and Reset ICs · SOT-23-5++UM823SS 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 200ms (tRP) when triggered and remains low whenever VCC is below the 2.93V reset threshold or when MR is a logic low. Guaranteed valid down to VCC=1V. VOL<=0.3V @ 4mA sink; VOH>=0.8*VCC @ 1mA source. |+| 2 | GND | power_in | Ground reference for all signals. |+| 3 | MR | input | Manual-Reset Input (active low). Triggers a reset pulse when pulled below 0.3*VCC. Has an internal ~52kΩ pull-up resistor; can be driven from TTL/CMOS logic or shorted to GND with a switch. Leave open or tie to VCC if unused. |+| 4 | WDI | input | Watchdog Input. If WDI stays high or low for longer than the watchdog timeout period (1.6s typical), the internal watchdog timer expires and a reset is triggered. The timer clears whenever RESET is asserted or WDI sees a rising or falling edge (min pulse width 50ns). Leaving WDI unconnected or three-stated disables the watchdog. |+| 5 | VCC | power_in | Supply voltage input. Operating range 1V to 7V; L-version electrical characteristics apply at VCC=4.75V to 5.5V for the family, but this S-variant is monitored at a 2.93V reset threshold. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Union Semiconductor |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `UM823SSSS`+- `UM823SSSP`++## CAD (KiCad official)++- Symbol: `UM823SS`+- 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/um823ss-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/um823ss-datasheet.pdf)

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