Memory AT24C256 Non-Volatile 8-DIP (0.300, 7.62mm) 256Kb 32K x 8 EEPROM -40°C~85°C TA 1.8V~5.5V I2C 1MHz IC EEPROM 256K I2C 1MHZ 8DIP
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Oct 12, 2021
Justin Yerkes
Servo Motor Control using AT24C256 EEPROM
Memory AT24C256 Non-Volatile 8-DIP (0.300, 7.62mm) 256Kb 32K x 8 EEPROM -40°C~85°C TA 1.8V~5.5V I2C 1MHz IC EEPROM 256K I2C 1MHZ 8DIP
AT24C256 is a Two-wire Serial EEPROM. This article is going to introduce a datasheet, PDF, pinout, address, Arduino, and other details about AT24C256 EEPROM. Furthermore, there is a huge range of semiconductors, capacitors, resistors, and ICs in stock. Welcome your RFQ!
AT24C256B-PU
The AT24C256 EEPROM is an 8-pin, 32-Kbyte Electrically Erasable Programmable Read-Only Memory Integrated Chip that stores data and information even when the power is turned off. It functions similarly to a pen drive. If necessary, the information on this IC can be rewritten or retrieved.
The wide range of operating voltage of AT24C256 EEPROM is from 1.7 Volts to 5.5 Volts, which can be used as an ideal EEPROM in both 3.3 Volts and 5 Volts systems. The storage space of this IC is 32 Kbyte Or 256Kbit and it is possible to cascade 8 similar EEPROM chips for expansion.
The AT24C256 EEPROM is an 8-pin integrated chip with 32 Kbyte memories. The AT24C256 EEPROM pin configuration is shown in the below tabular form. The pin diagram and the AT24C256 IC are shown in the figure below.
AT24C256 EEPROM 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 |
AT24C256 Footprint
AT24C256 3D Model
Microchip Technology AT24C256B-PU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology AT24C256B-PU.
Microchip Technology AT24C256B-PU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology AT24C256B-PU.
| Product Attribute | Attribute Value | |
|---|---|---|
| Mount | Through Hole | |
| Mounting Type | Through Hole | |
| Package / Case | 8-DIP (0.300, 7.62mm) | |
| Number of Pins | 8Pins | |
| Supplier Device Package | 8-PDIP | |
| Memory Types | Non-Volatile | |
| Operating Temperature | -40°C~85°C TA | |
| Packaging | Tube | |
| Published | 1997 | |
| Part Status | Obsolete | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Attribute | Attribute Value | |
|---|---|---|
| Max Operating Temperature | 85°C | |
| Min Operating Temperature | -40°C | |
| Voltage - Supply | 1.8V~5.5V | |
| Frequency | 1MHz | |
| Base Part Number | AT24C256 | |
| Interface | 2-Wire, I2C, Serial | |
| Max Supply Voltage | 5.5V | |
| Min Supply Voltage | 1.8V | |
| Memory Size | 256Kb 32K x 8 | |
| Nominal Supply Current | 3mA | |
| Clock Frequency | 1MHz |
| Product Attribute | Attribute Value | |
|---|---|---|
| Access Time | 550ns | |
| Memory Format | EEPROM | |
| Memory Interface | I2C | |
| Write Cycle Time - Word, Page | 5ms | |
| Density | 256 kb | |
| Max Frequency | 400kHz | |
| REACH SVHC | No SVHC | |
| Radiation Hardening | No | |
| RoHS Status | ROHS3 Compliant |
• Low-voltage and Standard-voltage Operation
– 1.8 (VCC = 1.8V to 5.5V)
• Internally Organized as 32,768 x 8
• Two-wire Serial Interface
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• Bidirectional Data Transfer Protocol
• 1 MHz (5.0V, 2.7V, 2.5V), and 400 kHz (1.8V) Compatibility
• Write Protect Pin for Hardware and Software Data Protection
• 64-byte Page Write Mode (Partial Page Writes Allowed)
• Self-timed Write Cycle (5 ms Max)
• High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 40 Years
• Lead-free/Halogen-free Devices Available
• 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, EIAJ SOIC, 8-lead Ultra-Thin Small Array
Package (SAP), 8-lead TSSOP, and 8-ball dBGA2 Packages
• Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers
Data Logging
Audio devices
Remote storage devices
Data analytics
Storage devices
Used where Flash memory of MCU is less
24LC512, AT24C256 EEPROM
With the help of a little example circuit schematic, let's learn how to use the AT24C256 EEPROM IC. The AT24C256 EEPROM IC communicates with the help of the I2C protocol. The circuit diagram for connecting an EEPROM IC to a microcontroller is given in the diagram below. The IC is given a supply voltage of 3.3 or 5 volts, and its communication lines are linked as indicated in the circuit diagram below.
AT24C256 EEPROM Circuit
Connect pin 6 SCK (Serial Clock) to the microcontroller's SCK pin and pin 5 SDA (Serial Data) to the microcontroller's SDA pin. Two pull-up resistors are used to pull the SCK and SDA pins to a high communication line, similar to I2C communication. This aids in maintaining the bus's idle state at a high level.
When more than one EEPROM or I2C device is connected to the same MCU, the A0, A1, and A2 select pins of this IC are used (Microcontroller unit). These address pins are otherwise connected to the ground. These three pins are linked to the GPIO pins in the preceding circuit layout because more than one EEPROM IC can be cascaded if necessary.
The Write Protect Pin on pin 7 of the AT24C256 EEPROM is utilized to strengthen data security in this IC. If WP (Write Protect) is set to zero (logic 0), the data on the EEPROM IC can be deleted or written. The data written on the IC is otherwise unchanged. If data security isn't a concern, this pin can be grounded (0). Regardless of the state of the WP pin, we can read the data from the EEPROM.
After successful communication, we can program the MCU to write/read the data to the EEPROM IC by using the values of the right register. Firstly we should specify the address of the location to where the data is to be read/written. This shows the normal process of how the data is read/written byte by byte.
An additional option of Page Write is provided by the equivalent 24LC512 EEPROM IC so that the user can write the data of 126 bytes continuously without mentioning any address of each byte of data.
The data interchange between the microcontroller and the EEPROM IC is depicted in the diagram above. The complete message may be broken down into four parts: the start bit, the slave address, the read/write bit, and finally the acknowledgment bit. The Slave address is further broken down into Control code and chip select bits. Because the control code is hardcoded and we are unable to change it, the value will always be 1010. The MCU determines the value of Chip Select bits. For example, if all three pins A2, A1, and A0 are set to low, the device's address will be 0x50. To learn more about how to communicate with the IC, read the datasheet at the bottom of the page.
Microchip Technology Inc. is a leader that provides microcontroller and analog semiconductors. The microchip was headquartered in Chandler, Arizona. We are dedicated to offering low-risk product development, reducing total system cost, and accelerating time to market. We mainly serve different fields of customers applications around the world. To provide prominent technical support along with reliable delivery and quality is our goal.
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