LMC555 CMOS Timer

@@ -0,0 +1,54 @@+# LMC555++**Texas Instruments** · Timer · SOIC-8++The LMC555 is a CMOS version of the classic 555 timer. It draws far less current than the bipolar 555, operates from 1.5 V to 15 V, and oscillates up to 3 MHz. Configured as an astable or monostable with an external RC, it generates clocks, pulses, PWM, and time delays with minimal power.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Ground reference voltage (0 V return for the supply). |+| 2 | TRIGGER | input | Trigger input responsible for transition of the internal flip-flop from set to reset. The output pulse of the timer depends on the amplitude of the external trigger pulse applied to this pin. Trigger threshold is nominally 1/3 V+. |+| 3 | OUTPUT | output | Output driven waveform. Sources/sinks up to 10 mA (VS=5 V) or 50 mA (VS=12 V) to directly drive TTL and CMOS loads. |+| 4 | RESET | input | Active-low reset. A negative pulse applied to this pin disables/resets the timer. When not used for reset purposes, connect this pin to V+ to avoid false triggering. Typical VRES = 0.7 V at VS = 1.5 V. |+| 5 | CONTROL_VOLTAGE | input | Control-voltage input sets the internal threshold and trigger levels (nominally 2/3 V+). An external voltage applied here modulates the output pulse width/waveform. Typically decoupled to ground with 0.01 uF when unused. |+| 6 | THRESHOLD | input | Threshold comparator input; compared against an internal reference of 2/3 V+. The voltage at this pin sets the reset state of the internal flip-flop. |+| 7 | DISCHARGE | output | Open-collector (open-drain) discharge pin that shorts the external timing capacitor to ground between intervals (in phase with OUTPUT). Toggles the output from high to low when THRESHOLD reaches 2/3 V+. |+| 8 | V+ | power_in | Positive supply voltage with respect to ground. Operating range 1.5 V to 15 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | CMOS timer (555-type) |+| Supply voltage | 1.5 V to 15 V |+| Max frequency | 3 MHz |+| Supply current | 100 uA typ at 5 V |+| Modes | Astable, monostable |+| Timing | External R and C |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `LMC555D`+- `LMC555DGK`+- `LMC555P`+- `LMC555YBF`+- `LMC555YPB`++## CAD (KiCad official)++- Symbol: `lmc555.kicad_sym`+- Footprint: `lmc555.kicad_mod`+- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lmc555.pdf) (35 pp, sha256 `993be6e487fb5fe6`, 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/lmc555-datasheet.pdf)

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