LMC555CMX

@@ -0,0 +1,58 @@+# LMC555CMX++**Texas Instruments** · Timers / Clock Oscillators · SOIC-8++LMC555CMX 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 voltage. All voltages in the datasheet are measured with respect to this pin. |+| 2 | TRIG | input | Trigger input (active low). Responsible for transition of the flip-flop from set to reset. A negative-going pulse below 1/3 Vcc sets the output high. Typical trigger voltage ~1.67 V at Vs = 5 V; trigger current ~10 pA. |+| 3 | OUT | output | Output driven waveform. CMOS/TTL-compatible push-pull output rated to source/sink up to ~50 mA at 5 V supply (tested at -10 mA / 50 mA output current levels). |+| 4 | RESET | input | Active-low reset input. Negative pulse applied to this pin disables or resets the timer. When not used for reset purposes it should be tied to V+ to avoid false triggering. VRES typ 0.7 V at Vs = 1.5 V (Vs must be >= 2.0 V if RESET is used at -20 degC or below). |+| 5 | CTRL | input | Control voltage input. Sets the threshold and trigger comparator levels (nominally 2/3 Vcc). Typically bypassed to GND with a 0.01 uF capacitor; can be driven externally to modulate the output waveform. |+| 6 | THRES | input | Threshold input. Compares the applied voltage against the internal 2/3 Vcc reference; when exceeded, the flip-flop is reset and the output goes low. Threshold input current ~10 pA at Vs = 5 V. |+| 7 | DISCH | output | Open-drain discharge output. Discharges the external timing capacitor between intervals (in phase with OUT). Toggles from high-impedance to low when the timing capacitor voltage reaches 2/3 Vcc. Discharge saturation voltage typ 150 mV at IDIS = 10 mA (Vs = 5 V). |+| 8 | V+ | power_in | Positive supply voltage with respect to GND. Recommended operating range 1.5 V to 15 V (absolute max 15 V). Typical supply current 100 uA at Vs = 5 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++- `LMC555CMXCM`+- `LMC555CMXCMX`+- `LMC555CMXIM`+- `LMC555CMXIMX`+- `LMC555CMXCMM`+- `LMC555CMXCMMX`+- `LMC555CMXIMM`+- `LMC555CMXIMMX`+- `LMC555CMXCN`+- `LMC555CMXN`+- `LMC555CMXTP`+- `LMC555CMXTPX`++## CAD (KiCad official)++- Symbol: `LMC555CMX`+- 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/lmc555cmx.pdf) (30 pp, sha256 `3ac8d41ac202b0b0`, 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/lmc555cmx-datasheet.pdf)

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