AT24C64CM

@@ -0,0 +1,57 @@+# AT24C64CM++**HGSEMI** · EEPROM · SOP-8++AT24C64CM 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. Sets the LSB of the hard-wired I2C slave address, allowing up to eight AT24C64C devices to share a bus. Tie to VCC or GND; if left floating, an internal pull-down to GND is applied. |+| 2 | E1 | input | Device address input bit 1. Sets bit 1 of the hard-wired I2C slave address. Tie to VCC or GND; internally pulled down to GND if left floating. |+| 3 | E2 | input | Device address input bit 2 (MSB of the address select). Tie to VCC or GND; internally pulled down to GND if left floating. |+| 4 | GND | power_in | Ground reference for the power supply. Must be connected to system ground. |+| 5 | SDA | bidirectional | I2C serial data. Open-drain bidirectional line for command, address, and data transfer. Requires an external pull-up resistor to VCC. Data is latched on the rising edge of SCL and driven on the falling edge. |+| 6 | SCL | input | I2C serial clock input from the bus master. Controls flow of data into and out of the device; requires an external pull-up resistor to VCC. Supports up to 400 kHz Fast Mode and 1 MHz High-Speed Mode. |+| 7 | WP | input | Write Protect input. When tied to VCC, the entire memory array becomes read-only (write commands are NACKed on data bytes). When tied to GND, writes are enabled. Internally pulled down to GND if left floating. |+| 8 | VCC | power_in | Device power supply, 1.7 V to 5.5 V. Standby current 1 uA max; active read/write current 0.5 mA max. Bypass with a local decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++- `AT24C64CMN`+- `AT24C64CMM`+- `AT24C64CMM/TR`+- `AT24C64CMMT`+- `AT24C64CMMT/TR`+- `AT24C64CMMM`+- `AT24C64CMMM/TR`+- `AT24C64CMDQ`+- `AT24C64CMDQ/TR`+- `AT24C64CMM5`+- `AT24C64CMM5/TR`++## CAD (KiCad official)++- Symbol: `AT24C64CM`+- 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/at24c64cm-datasheet.pdf) (24 pp, sha256 `47ba875d6f9c245f`, 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/at24c64cm-datasheet.pdf)

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