Specifications
| Type | Description |
|---|---|
| Part Number | AT24C64B |
| Manufacturer | Atmel |
| Product Type | Serial EEPROM |
| Category | Memory & Storage |
| Package / Case | 8-lead TSSOP |
| Memory Density | 64 Kbit / 65,536 bits; organized as 8,192 x 8 |
| Memory Organization | 8,192 words x 8 bits; internal organization |
| Page Organization | 256 pages x 32 bytes; 64K Serial EEPROM |
| Page Write Size | 32 bytes; partial page writes allowed |
| Random Address Width | 13-bit data word address; random word addressing |
| Interface | 2-wire serial interface; serial EEPROM access interface |
| Clock Frequency | 400 kHz max; SCL |
| Supply Voltage | 2.7 V min, 5.5 V max; recommended operating range |
| Operating Temperature Range | -40°C to +125°C; automotive temperature range / recommended operating range |
| Absolute Operating Temperature | -55°C to +125°C; absolute maximum rating |
| Storage Temperature | -65°C to +150°C; absolute maximum rating |
| Voltage on Any Pin | -1.0 V to +7.0 V; with respect to ground, absolute maximum rating |
| Maximum Operating Voltage | 6.25 V; absolute maximum rating |
| DC Output Current | 5.0 mA; absolute maximum rating |
| SDA Input/Output Capacitance | 8 pF max; TA=25°C, f=1.0MHz, VCC=5.5V, VI/O=0V; characterized, not 100% tested |
| Input Capacitance | 6 pF max; A0, A1, A2, SCL; TA=25°C, f=1.0MHz, VCC=5.5V, VIN=0V; characterized, not 100% tested |
| Read Supply Current | 0.4 mA typ, 1.0 mA max; VCC=5.0V, read at 400kHz |
| Write Supply Current | 2.0 mA typ, 3.0 mA max; VCC=5.0V, write at 400kHz |
| Standby Current | 1.0 µA typ, 3.0 µA max; VCC=2.7V, VIN=VCC or VSS |
| Standby Current | 3.0 µA typ, 5.0 µA max; VCC=5.0V, VIN=VCC or VSS |
| Input Leakage Current | 0.10 µA typ, 3.0 µA max; VIN=VCC or VSS |
| Output Leakage Current | 0.05 µA typ, 3.0 µA max; VOUT=VCC or VSS |
| Input Low Level | -0.6 V min, VCC x 0.3 max; reference only, not tested |
| Input High Level | VCC x 0.7 min, VCC + 0.5 V max; reference only, not tested |
| Output Low Level | 0.4 V max; VCC=3.0V, IOL=2.1mA |
| Output Low Level | 0.2 V max; VCC=1.8V, IOL=0.15mA |
| Clock Pulse Width Low | 1.2 µs min; SCL timing, TA=-40°C to +125°C, VCC=2.7V to 5.5V, CL=1 TTL gate and 100pF |
| Clock Pulse Width High | 0.6 µs min; SCL timing, TA=-40°C to +125°C, VCC=2.7V to 5.5V, CL=1 TTL gate and 100pF |
| Noise Suppression Time | 50 ns max; characterized only |
| Clock Low to Data Out Valid | 0.1 µs min, 0.9 µs max; tAA |
| Bus Free Time Before New Transmission | 1.2 µs min; tBUF; characterized only |
| Start Hold Time | 0.6 µs min; tHD.STA |
| Start Set-up Time | 0.6 µs min; tSU.STA |
| Data In Hold Time | 0 µs min; tHD.DAT |
| Data In Set-up Time | 100 ns min; tSU.DAT |
| Input Rise Time | 0.3 µs max; tR; characterized only |
| Input Fall Time | 300 ns max; tF; characterized only |
| Stop Set-up Time | 0.6 µs min; tSU.STO |
| Data Out Hold Time | 50 ns min; tDH |
| Write Cycle Time | 5 ms max; self-timed write cycle, tWR |
| Endurance | 1,000,000 write cycles; 5.0V, 25°C, page mode; characterized only |
| Data Retention | 100 years; high reliability feature |
| Cascadable Devices | Up to 8 devices on one bus; using A2, A1, A0 device address inputs |
| Device Address Format | 1010 A2 A1 A0 R/W; 8-bit device address word for 64K EEPROM |
| Write Protection | Upper quadrant write protected; WP pin at VCC inhibits writes to upper quadrant; WP at GND allows normal writes |
| Datasheet Status | request_only |
Product Overview
The Atmel AT24C64B is a 64 Kbit 2-wire serial EEPROM for Memory & Storage applications. Its internal array is organized as 8,192 words x 8 bits, giving a total capacity of 65,536 bits. The 64K device uses 256 pages of 32 bytes, and partial page writes are allowed within the 32-byte page write structure.
Serial access uses a 2-wire interface with SCL operation up to 400 kHz. Random word addressing uses a 13-bit data word address, while the device address format is 1010 A2 A1 A0 R/W. The A2, A1, and A0 address inputs allow up to eight devices on one bus.
The device operates from 2.7 V to 5.5 V over the -40°C to +125°C automotive temperature range and is offered in an 8-lead TSSOP package. Electrical limits include 0.4 mA typical read current at 5.0 V and 400 kHz, 2.0 mA typical write current under the same clock condition, and standby current ratings at both 2.7 V and 5.0 V. The WP pin supports upper-quadrant write protection when tied to VCC.
Key Features
- 64 Kbit EEPROM organized as 8,192 x 8
- 256 pages with 32-byte page write size
- 2-wire serial interface with 400 kHz SCL maximum
- 2.7 V to 5.5 V recommended supply range
- -40°C to +125°C automotive operating range
- 13-bit random word addressing
- Up to eight devices on one serial bus
- Upper-quadrant write protection through WP pin
- 5 ms maximum self-timed write cycle
- 100-year data retention rating
Typical Applications
- Nonvolatile configuration storage
- Calibration data storage
- Serial bus parameter memory
- Addressable system data storage
- Automotive temperature EEPROM designs
- Multi-device 2-wire memory buses
Procurement Notes
When requesting a quote for AT24C64B, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For memory and storage sourcing, density, organization, speed grade, voltage, package, temperature grade, date code, lifecycle status and original packing condition should be verified before approval.
FAQ
What memory density does the AT24C64B provide?
The AT24C64B provides 64 Kbit, or 65,536 bits, of EEPROM memory. The internal memory organization is 8,192 words x 8 bits, and the page organization is 256 pages x 32 bytes.
What serial interface and clock rate does AT24C64B use?
The device uses a 2-wire serial interface for EEPROM access. The SCL clock frequency is specified at 400 kHz maximum under the listed timing conditions for the -40°C to +125°C operating range.
What supply and temperature ranges apply to this EEPROM?
The recommended operating supply range is 2.7 V to 5.5 V. The operating temperature range is -40°C to +125°C for the automotive temperature range, with separate absolute maximum temperature and storage ratings listed in the datasheet facts.
How does write protection work on the AT24C64B?
The WP pin controls upper-quadrant write protection. With WP at VCC, writes to the upper quadrant are inhibited. With WP at GND, normal writes are allowed according to the extracted device description.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.