TPS3705-33DR

@@ -0,0 +1,50 @@+# TPS3705-33DR++**Texas Instruments** · Supervisor and Reset ICs · SOIC-8++TPS3705-33DR from Texas Instruments, in a SOIC-8. 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 | MR | input | Manual reset input (active low). Driving this pin low asserts RESET for the fixed 200 ms reset timeout period. Internally pulled up; can be left open if unused. |+| 2 | VDD | power_in | Supply voltage input. Recommended operating range 2 V to 6 V (absolute max 7 V). Nominal supply current 50 μA max. Monitored against internal fixed threshold V_IT+ = 2.93 V (3.3 V option). |+| 3 | GND | power_in | Device ground reference. All voltage measurements are with respect to GND. |+| 4 | PFI | input | Power-fail comparator input. Compared against an internal reference (typ. 1.25 V); a resistor divider from the monitored rail sets the trip point. Drives PFO low when V_PFI falls below the reference. |+| 5 | PFO | output | Power-fail comparator output (active low). Open-drain/push-pull digital output that asserts low when V_PFI is below the internal reference, providing early warning of an impending supply loss or low-battery condition. |+| 6 | WDI | input | Watchdog timer input. Must be toggled by the host within the watchdog timeout window; missing an edge causes WDO to assert. Can be left floating to disable watchdog function. |+| 7 | RESET | output | Active-low reset output. Asserted low while V_DD is below V_IT+ or during power-up (V_DD < 1.1 V), and held low for the fixed 200 ms timeout after V_DD returns above V_IT+. Also asserted by MR low. |+| 8 | WDO | output | Watchdog timer output (active low). Asserted low when WDI has not toggled within the watchdog timeout period, signaling a host lockup. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `TPS3705-33DRTPS3705-33D`+- `TPS3705-33DR`+- `TPS3705-33DRTPS3705-33DGN`+- `TPS3705-33DRTPS3705-33DGNR`++## CAD (KiCad official)++- Symbol: `TPS3705-33DR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](docs/tps3705-33dr-datasheet.pdf) (29 pp, sha256 `4a3d7db6b372dd6a`, 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/tps3705-33dr-datasheet.pdf)

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