AT24C256 DIP‑8 EEPROM IC
The AT24C256 DIP‑8 EEPROM IC provides 262,144 bits of two‑wire serial electrically erasable and programmable memory organized as 32,768 × 8 bits. Operating from 1.8 V to 5.5 V, it supports up to four devices on a single bus, offers self‑timed write cycles, and is optimized for low‑power industrial and commercial applications.
Features
- Low-Voltage and Standard-Voltage Operation
- 2.7 (VCC = 2.7V to 5.5V)
- 1.8 (VCC = 1.8V to 5.5V)
- Low-Power Devices (ISB = 2μA at 5.5V) Available
- Internally Organized 16,384 x 8 and 32,768 x 8
- 2-Wire Serial Interface
- Schmitt Trigger, Filtered Inputs for Noise Suppression
- Bidirectional Data Transfer Protocol
- 1 MHz (5V), 400 kHz (2.7V, 2.5V) and 100 kHz (1.8V) Compatibility
- Write Protect Pin for Hardware Data Protection
- 64-byte Page Write Mode (Partial Page Writes Allowed)
- Self-Timed Write Cycle (10 ms max)
- Automotive Grade and Extended Temperature Devices Available
Specifications
| Parameter | Value |
|---|---|
| Model | AT24C256 |
| Organization | 32,768 × 8 bits |
| Supply Voltage (VCC) | 1.8–3.6 V; 2.7–5.5 V |
| Interface | Two‑wire serial (I²C‑compatible) |
| Clock Rate (fSCL) | 100 kHz @1.8 V; 400 kHz @2.7 V; 1 MHz @5 V |
| Page Write Size | 64 bytes |
| Write Cycle Time (tWR) | 5 ms max |
| Endurance | 1 000 000 write cycles |
| Data Retention | 40 years |
| Operating Temperature | –55 °C to +125 °C |
| Package | 8‑lead JEDEC PDIP (also SOIC, TSSOP, MAP) |
| Pin Count | 8 |
PINOUT
| Pin No | Pin Name | Description |
| 1 | A0 | User Configurable Chip Select |
| 2 | A1 | User Configurable Chip Select |
| 3 | NC | No Connection |
| 4 | GND | Ground Pin |
| 5 | SDA | Serial Data Pin |
| 6 | SCL | Serial Clock Pin |
| 7 | WP | Write Protect Pin |
| 8 | VCC | Power Supply Pin |
Dimensions
Applications
- Data Logging
- Audio devices
- Remote storage devices
- Data analytics
- Storage devices
- Used where Flash memory of MCU is less
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