Part Number: AT24C512C-MAHM-T

Manufacturer: Microchip Technology

Description: IC EEPROM 512KBIT I2C 8UDFN

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of AT24C512C-MAHM-T

Category Integrated Circuits (ICs)
Family Memory
Manufacturer Atmel
Packaging Tape & Reel (TR)
Part Status Active
Format – Memory EEPROMs – Serial
Memory Type EEPROM
Memory Size 512K (64K x 8)
Speed 400kHz, 1MHz
Interface I2C, 2-Wire Serial
Voltage – Supply 1.7 V ~ 3.6 V
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 8-UFDFN Exposed Pad
Supplier Device Package 8-Mini Map (2×3)

AT24C512C-MAHM-T Description

The AT24C512C is a serial electrically erasable and programmable read-only memory chip that can store a total of 524,288 bytes in 65,536 words of 8 bits each. The cascading feature allows up to eight devices to share a common two-wire bus. The gadget is designed for various industrial and business uses where low power and low voltage operation are crucial.

AT24C512C-MAHM-T Features

  • Schmitt Triggers with Filtered Inputs to Reduce Noise.
  • Protocol for bidirectional data transfer.
  • Write-Protect Pin for Hardware Data Protection of the Entire Array.
  • Maximum Standby Current (6 A) and Ultra-Low Active Current (3 mA) Sequential and random read modes.
  • Maximum Self-Timed Write Cycle of 5 ms.
  • Protection from ESD > 4,000V

Device Operation and Communication

The AT24C512C is a client device that functions and communicates with a host controller, also known as the bus host, using a standard two-wire digital serial interface that is I2C compliant. The bus host is also referred to as the bus host. This interface is typically referred to by its more common term, the bus host.

The host is responsible for initiating and managing all read and write operations to client devices on the serial bus. Both the host device and the client devices have the capability of sending and receiving data via the bus. The two signal lines that make up the Serial interface are the Serial Clock (SCL) line and the Serial Data line. This makes up the Serial interface (SDA).

While the SDA pin is responsible for multiple functions, including receiving command and data information from the host and sending data back to the host, the SCL pin receives the clock signal from the host. This is in contrast to the SDA pin, which performs only one function: receiving the clock signal from the host.

The SDA pin is a pin that may go in both directions. The rising edge of SCL is used to latch data into the AT24C512C, while the falling edge of SCL is used to output data from the chip. The rising edge of SCL is used in both operations. Because of this property, data is never lost when the device is accidentally powered off. Schmitt Triggers with integrated spike suppression filters in the SCL and SDA pins decrease input spikes and bus noise. The most significant bit (MSb) is always sent first when sending data or commands. This is true regardless of the type of information being transmitted. During the process of bus communication, the sending of one data bit is the outcome of each clock cycle. After eight bits of data have been transferred, the host will produce a ninth clock cycle called the ACK/NACK cycle. During the ninth cycle of the clock, the receiving device must send back an acknowledgment or a non-acknowledgment. As a direct consequence, the transfer of each data byte must occur over nine clock cycles.

There must be no pauses or gaps in the data stream while it is being moved from one data byte to another. Since read and write operations have no idle clock cycles, it is tested for an ACK or NACK. Among other things, this involves ensuring that there is no break in the data stream. During the data transfer process, the information stored on the SDA pin may only be modified when the SCL pin is in its low state. This information may not be modified when the SCL pin is in its high state.

If the data being read from the SDA pin changes while SCL is high, then either the Start or the Stop condition will be activated. Start and stop conditions initiate and terminate any serial bus communication between a host device and one or more client devices. This communication can take place between any number of devices. The host is the one who decides the maximum amount of data bytes that can be supplied in the time between a Start condition and a Stop condition; there are no limits placed on this number. For the serial bus to be considered to be idle, both the SCL pin and the SDA pin must be in the logic high state at the same time.

Data and Clock Transition Requirements

Since it is an open-drain terminal, the SDA pin needs a pull-up resistor to remain in the high state. As an input pin, SCL can be set to high by driving it or pulled high by an external pull-up resistor. Only when SCL is low can there be a change in data on the SDA pin. If there is a change in the data when the SCL is high, it will signal a Start or Stop condition.

Start and Stop Conditions

● Start Condition

When the SDA pin switches from high to low, which constitutes a start condition, the SCL pin stays in a consistent logic 1 state. When this occurs, the device will come out of Standby mode and resume normal operation. Every command must start with the correct Start condition since the host will always use one to start a data transmission sequence. The device’s SDA and SCL pins will be continuously checked for a Start condition, but if one is not discovered, the device won’t respond.

● Write Operations

Before sending the word address bytes and the AT24C512C device address byte, the host sends a Start condition with the R/W bit set to logic 0 and the AT24C512C device address byte. This procedure is carried out over and again for each write operation performed on the AT24C512C. The data value or values that will be recorded onto the device come next, following the phrase “address bytes.”

● Byte Write

An 8-bit long single byte can be written using the AT24C512C. The AT24C512C requires a 16-bit word address to select a data word. The EEPROM will send an acknowledgment after receiving the correct device address and word address bytes. After that, the device will be ready to recognize the 8-bit data word. The EEPROM will send an acknowledgment, or ACK, after receiving the 8-bit data word.

The addressing device, which may be a bus host, is in charge of ending the write process with a Stop condition. The nonvolatile EEPROM will then commence an internally self-timed write cycle, completed within tWR, while the data word is programmed into it. The EEPROM will be nonvolatile throughout this time. Each input will be disabled during this write cycle, and the EEPROM won’t respond until the writing is complete.

● Page Write

If all the bytes being written are located in the same row of the memory array, then a page write operation can allow up to 128 bytes to be written during the same write cycle (where address bits A15 through A7 are the same). Writes to portions of pages that are smaller than 128 bytes can also be performed.


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