NE556M

@@ -0,0 +1,58 @@+# NE556M++**HGSEMI** · Timers / Clock Oscillators · SOP-14++NE556M from HGSEMI, in a SOP-14. 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 | DIS1 | output | Discharge pin for timer 1. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state. |+| 2 | THR1 | input | Threshold input for timer 1. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval. |+| 3 | OUT1 | output | Output of timer 1. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC. |+| 4 | RST1 | input | Reset input for timer 1 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused. |+| 5 | CON1 | input | Control voltage input for timer 1. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused. |+| 6 | TRG1 | input | Trigger input for timer 1 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high. |+| 7 | GND | power_in | Device ground reference. Common return for both timers and all internal circuitry. |+| 8 | TRG2 | input | Trigger input for timer 2 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high. |+| 9 | CON2 | input | Control voltage input for timer 2. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused. |+| 10 | RST2 | input | Reset input for timer 2 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused. |+| 11 | OUT2 | output | Output of timer 2. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC. |+| 12 | THR2 | input | Threshold input for timer 2. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval. |+| 13 | DIS2 | output | Discharge pin for timer 2. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state. |+| 14 | VCC | power_in | Positive supply voltage, 4.5V to 16V. Powers both internal timer sections; bypass locally with a 0.1 uF ceramic to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-14 |+| Category | RTC |+| Pins | 14 |++## Ordering variants++Same part, different packaging or reel option.++- `NE556MM`+- `NE556MN`+- `NE556MP`++## CAD (KiCad official)++- Symbol: `NE556M`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOP-14 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/ne556m-datasheet.pdf) (9 pp, sha256 `fdee0501f2001d17`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/ne556m-datasheet.pdf)

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