# AT24LC64N

**HGSEMI** · EEPROM · DIP-8

AT24LC64N from HGSEMI, in a DIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A0 | input | Device address input that is hard wired; up to eight 32K/64K devices can share one bus. |
| 2 | A1 | input | Device address input that is hard wired; up to eight 32K/64K devices can share one bus. |
| 3 | A2 | input | Device address input that is hard wired; up to eight 32K/64K devices can share one bus. |
| 4 | GND | power_in | Ground. |
| 5 | SDA | bidirectional | Bidirectional open-drain serial data pin that may be wire-ORed with other open-drain or open-collector devices and needs an external pull-up. |
| 6 | SCL | input | Serial clock input that clocks data into the device on the positive edge and out on the negative edge. |
| 7 | WP | input | Write protect input: connected to GND allows normal read/write, connected to VCC protects the full array. |
| 8 | VCC | power_in | Power supply, 1.8V to 5.5V operating range. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | DIP-8 |
| Category | Memory |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | Vcc | 1.8 |  | 5.5 | V |  | 9 |
| Supply Current (Read) | Icc1 |  | 0.4 | 1 | mA | Vcc=5.0V, Read @100KHz | 9 |
| Supply Current (Write) | Icc2 |  | 2 | 3 | mA | Vcc=5.0V, Write @100KHz | 9 |
| Standby Current | ISB |  |  | 2 | uA | Vin=Vcc or GND | 9 |
| Input Leakage Current | ILI |  |  | 3 | uA | Vin=Vcc or GND | 9 |
| Output Leakage Current | ILO |  | 0.05 | 3 | uA | Vout=Vcc or GND | 9 |
| Output Low Level (Vcc=5.0V) | VOL3 |  |  | 0.4 | V | Vcc=5.0V, IOL=3.0mA | 9 |
| Output Low Level (Vcc=3.0V) | VOL2 |  |  | 0.4 | V | Vcc=3.0V, IOL=2.1mA | 9 |
| Output Low Level (Vcc=1.8V) | VOL1 |  |  | 0.2 | V | Vcc=1.8V, IOL=0.15mA | 9 |
| Input/Output Capacitance (SDA) | CI/O |  |  | 8 | pF | VI/O = 0V | 9 |
| Input Capacitance (A0, A1, A2, SCL) | CIN |  |  | 6 | pF | VIN = 0V | 9 |
| DC Supply Voltage (absolute maximum) |  | -0.3 |  | 6.5 | V |  | 9 |
| Operating Ambient Temperature (absolute maximum table) |  | -40 |  | 85 | ℃ |  | 9 |
| Storage Temperature |  | -65 |  | 150 | ℃ |  | 9 |
| Lead Temperature |  |  |  | 260 | ℃ | Soldering, 10 seconds | 9 |
| Clock Frequency, SCL (1.8V) | fSCL |  |  | 400 | KHz |  | 10 |
| Clock Frequency, SCL (5.0V) | fSCL |  |  | 1000 | KHz |  | 10 |
| Clock Pulse Width Low (1.8V) | tLOW | 1.2 |  |  | us |  | 10 |
| Clock Pulse Width Low (5.0V) | tLOW | 0.6 |  |  | us |  | 10 |
| Clock Pulse Width High (1.8V) | tHIGH | 0.6 |  |  | us |  | 10 |
| Clock Pulse Width High (5.0V) | tHIGH | 0.4 |  |  | us |  | 10 |
| Noise Suppression Time (1.8V) | tI |  |  | 50 | us |  | 10 |
| Noise Suppression Time (5.0V) | tI |  |  | 40 | us |  | 10 |
| Clock Low to Data Out Valid (1.8V) | tAA | 0.05 |  | 0.9 | us |  | 10 |
| Clock Low to Data Out Valid (5.0V) | tAA | 0.05 |  | 0.55 | us |  | 10 |
| Bus Free Time before New Transmission (1.8V) | tBUF | 1.2 |  |  | us |  | 10 |
| Bus Free Time before New Transmission (5.0V) | tBUF | 0.5 |  |  | us |  | 10 |
| Start Hold Time (1.8V) | tHD.STA | 0.6 |  |  | us |  | 10 |
| Start Hold Time (5.0V) | tHD.STA | 0.25 |  |  | us |  | 10 |
| Start Setup Time (1.8V) | tSU.STA | 0.6 |  |  | us |  | 10 |
| Start Setup Time (5.0V) | tSU.STA | 0.25 |  |  | us |  | 10 |
| Data In Hold Time (1.8V) | tHD.DAT | 0 |  |  | us |  | 10 |
| Data In Hold Time (5.0V) | tHD.DAT | 0 |  |  | us |  | 10 |
| Data In Setup Time (1.8V) | tSU.DAT | 100 |  |  | ns |  | 10 |
| Data In Setup Time (5.0V) | tSU.DAT | 100 |  |  | ns |  | 10 |
| Inputs Rise Time (1.8V) | tR |  |  | 0.3 | us |  | 10 |
| Inputs Rise Time (5.0V) | tR |  |  | 0.3 | us |  | 10 |
| Inputs Fall Time (1.8V) | tF |  |  | 300 | ns |  | 10 |
| Inputs Fall Time (5.0V) | tF |  |  | 100 | ns |  | 10 |
| Stop Setup Time (1.8V) | tSU.STO | 0.6 |  |  | us |  | 10 |
| Stop Setup Time (5.0V) | tSU.STO | 0.25 |  |  | us |  | 10 |
| Data Out Hold Time (1.8V) | tDH | 50 |  |  | ns |  | 10 |
| Data Out Hold Time (5.0V) | tDH | 50 |  |  | ns |  | 10 |
| Write Cycle Time (1.8V) | tWR |  |  | 5 | ms |  | 10 |
| Write Cycle Time (5.0V) | tWR |  |  | 5 | ms |  | 10 |

## CAD (KiCad official)

- Symbol: `AT24LC64N`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `at24lc64n-etched.step` / `at24lc64n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at24lc64n.step` / `at24lc64n.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8785206327685251072) (15 pp, sha256 `804d1549093c782d`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/at24lc64n-datasheet.pdf)