SA555DR

@@ -0,0 +1,49 @@+# SA555DR++**Texas Instruments** · Timers / Clock Oscillators · SOIC-8++SA555DR 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 | GND | power_in | Ground reference (0 V) for the device. |+| 2 | TRIG | input | Trigger input. The output pulse begins when a negative-going pulse on TRIG crosses below 1/3 VCC, setting the internal flip-flop and driving OUT high. |+| 3 | OUT | output | Timer output. Drives high (near VCC) during the timing interval and low (near GND) otherwise. Capable of sourcing/sinking up to ~200 mA. |+| 4 | RESET | input | Active-low reset. When held below ~0.7 V, the timing cycle is interrupted and OUT is forced low. Tie to VCC when unused. |+| 5 | CONT | input | Control voltage. Provides access to the internal 2/3 VCC threshold reference. Typically bypassed to GND with a 10 nF capacitor for noise immunity; can be driven to modulate the timing thresholds. |+| 6 | THRES | input | Threshold input. Resets the internal flip-flop (ending the output pulse) when the voltage on THRES rises above 2/3 VCC. |+| 7 | DISCH | output | Discharge. Open-collector output tied to the timing capacitor; provides a low-impedance path to GND to discharge the external timing capacitor between cycles. |+| 8 | VCC | power_in | Positive supply voltage. Operating range 4.5 V to 16 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++- `SA555DRDR`+- `SA555DRD`+- `SA555DRP`++## CAD (KiCad official)++- Symbol: `SA555DR`+- 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](https://www.ti.com/lit/ds/symlink/sa555.pdf) (39 pp, sha256 `c6f5275b8c31eb1d`, retrieved 2026-08-17, tier: manufacturer)+- **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/sa555dr-datasheet.pdf)

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