AT24C256CM

@@ -0,0 +1,50 @@+# AT24C256CM++**HGSEMI** · EEPROM · SOP-8++AT24C256CM from HGSEMI, 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 | E0 | input | Device address input bit 0. Hard-wired to VCC or GND to set the least-significant bit of the 7-bit I2C slave address, allowing up to eight AT24C256C devices on the same bus. Schmitt-trigger CMOS input. |+| 2 | E1 | input | Device address input bit 1. Hard-wired to VCC or GND to set one of the three slave-address selection bits (E2, E1, E0). Schmitt-trigger CMOS input. |+| 3 | E2 | input | Device address input bit 2. Hard-wired to VCC or GND to set the most-significant slave-address selection bit. Schmitt-trigger CMOS input. |+| 4 | GND | power_in | Ground reference for the power supply. Must be tied to system ground. |+| 5 | SDA | bidirectional | Serial data. Open-drain bidirectional I2C data line; requires an external pull-up resistor to VCC. Data is latched on the rising edge of SCL and driven out on the falling edge. |+| 6 | SCL | input | Serial clock input. Provides the clock reference for the 2-wire I2C interface; supports Standard (100 kHz), Fast (400 kHz), and High-Speed (1 MHz) modes. Schmitt-trigger input with integrated spike-suppression filter. |+| 7 | WP | input | Write-Protect input. Tie to VCC to hardware write-protect the entire memory array (device becomes read-only); tie to GND or leave floating to enable normal write operations. |+| 8 | VCC | power_in | Device power supply, 1.7 V to 5.5 V. Recommend a 100 nF ceramic decoupling capacitor between VCC and GND close to the pin. Standby current <1 uA typical. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++- `AT24C256CMCM/TR`+- `AT24C256CMCN`+- `AT24C256CMCMM/TR`+- `AT24C256CMCMT/TR`++## CAD (KiCad official)++- Symbol: `AT24C256CM`+- 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:** [HGSEMI datasheet](docs/at24c256cm-datasheet.pdf) (25 pp, sha256 `fc01506b5cd4c437`, 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/at24c256cm-datasheet.pdf)

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