XL551

@@ -0,0 +1,50 @@+# XL551++**XINLUDA** · Timers / Clock Oscillators · SOP-8++XL551 from XINLUDA, in a SOP-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 | GND | power_in | Ground reference. All voltage values are with respect to network GND. |+| 2 | TRIG | input | Trigger input. Start of timing input. When TRIG < 1/2 CONT (approximately 1/3 VDD by default), the internal flip-flop is set, driving OUT high and turning off the discharge switch. |+| 3 | OUT | output | High-current timer output signal. VOH typ 4.8V at IOH=1mA (VDD=5V); VOL typ 0.21V at IOL=8mA. Sinks up to 100mA and sources up to 10mA typical. |+| 4 | RESET | input | Active-low reset input. When held low, forces OUT low and turns the discharge switch on, overriding all other inputs. Tie high (to VDD) when unused to prevent false triggering. |+| 5 | CONT | input | Control voltage input. Sets comparator thresholds; nominally at 2/3 VDD (open-circuit typ 66.7% of VDD). Allows bypass capacitor connection (typically 10nF to GND) or external threshold override. |+| 6 | THRES | input | Threshold input. End of timing input. When THRES > CONT (approximately 2/3 VDD by default), the internal flip-flop is reset, driving OUT low and turning the discharge switch on. |+| 7 | DISCH | output | Discharge. Open-collector output used to discharge the external timing capacitor to GND when OUT is low. Provides a low-impedance path to GND during the reset/low-output state. |+| 8 | VDD | power_in | Power-supply voltage. Recommended operating range 2V to 15V; absolute maximum 17.5V. Typical IDD = 170uA at VDD=5V (max 350uA at 25 degC). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XINLUDA |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `XL551`+- `XL551XD551`++## CAD (KiCad official)++- Symbol: `XL551`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XINLUDA datasheet](docs/xl551-datasheet.pdf) (12 pp, sha256 `8c2a047422caeea7`, 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/xl551-datasheet.pdf)

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