AT24C512N

AT24C512 Features • Low-voltage and Standard-voltage Operation • • • • • • • • • • • – 5.0 (VCC = 4.5V to 5.5V) – 2.7 (VCC = 2.7V to 5.5V) – 1.8 (VCC = 1.8V to 3.6V) Internally Organized 65,536 x 8 2-wire Serial Interface Schmitt Triggers, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 1 MHz (5V), 400 kHz (2.7V) and 100 kHz (1.8V) Compatibility Write Protect Pin for Hardware and Software Data Protection 128-byte Page Write Mode (Partial Page Writes Allowed) Self-timed Write Cycle (5 ms Typical) High Reliability – Endurance: 100,000 Write Cycles – Data Retention: 40 Years – ESD Protection: >4000V Automotive Grade and Extended Temperature Devices Available 8-pin PDIP and 20-pin JEDEC SOIC, 8-pin LAP, and 8-ball dBGATM Packages 2-wire Serial EEPROM 24C512 AT24C512 512K (65,536 x 8) Description The AT24C512 provides 524,288 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 65,536 words of 8 bits each. The device’s cascadable feature allows up to 4 devices to share a common 2-wire bus. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The devices are available in space-saving 8-pin PDIP, 20-pin JEDEC SOIC, 8-pin Leadless Array (LAP), and 8-ball dBGA packages. In addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 3.6V) versions. Pin Configurations Pin Name Function A0 - A1 Address Inputs SDA Serial Data SCL Serial Clock Input WP Write Protect NC No Connect 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 A0 A1 NC GND 8 7 6 5 1 2 3 4 VCC WP SCL SDA 8-pin Leadless Array VCC WP SCL SDA 20-pin SOIC A0 A1 NC NC NC NC NC NC NC GND 8-pin PDIP VCC WP NC NC NC NC NC NC SCL SDA http://www.hgsemi.com.cn 1 2 3 4 8 7 6 5 A0 A1 NC GND Bottom View 8-ball dBGA VCC WP SCL SDA 8 1 7 2 6 3 5 4 A0 A1 NC GND Bottom View 1 2018 JUN AT24C512 Absolute Maximum Ratings* *NOTICE: Operating Temperature.................................. -55°C to +125°C Storage Temperature ..................................... -65°C to +150°C Voltage on Any Pin with Respect to Ground .....................................-1.0V to +7.0V Maximum Operating Voltage .......................................... 6.25V Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Output Current........................................................ 5.0 mA Block Diagram Pin Description SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device. SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open collector devices. DEVICE/PAGE ADDRESSES (A1, A0): The A1 and A0 pins are device address inputs that are hardwired or left not connected for hardware compatibility with AT24C128/256. When the pins are hardwired, as many as four 512K devices may be addressed on a single bus system (device addressing is discussed in detail under the Device Addressing section). When the pins are not hardwired, the default A1 and A0 are zero. http://www.hgsemi.com.cn 2 WRITE PROTECT (WP): The write protect input, when tied to GND, allows normal write operations. When WP is tied high to VCC, all write operations to the memory are inhibited. If left unconnected, WP is internally pulled down to GND. Switching WP to VCC prior to a write operation creates a software write protect function. Memory Organization AT24C512, 512K SERIAL EEPROM: The 512K is internally organized as 512 pages of 128-bytes each. Random word addressing requires a 16-bit data word address. 2018 JUN AT24C512 Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V. Symbol Test Condition CI/O CIN Note: Max Units Conditions Input/Output Capacitance (SDA) 8 pF VI/O = 0V Input Capacitance (A0, A1, SCL) 6 pF VIN = 0V 1. This parameter is characterized and is not 100% tested. DC Characteristics Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = +1.8V to +5.5V, TAC = 0°C to +70°C, VCC = +1.8V to +5.5V (unless otherwise noted). Symbol Parameter VCC1 Supply Voltage VCC2 Max Units 1.8 3.6 V Supply Voltage 2.7 5.5 V VCC3 Supply Voltage 4.5 5.5 V ICC1 Supply Current VCC = 5.0V READ at 400 kHz 1.0 2.0 mA ICC2 Supply Current VCC = 5.0V WRITE at 400 kHz 2.0 3.0 mA Standby Current (1.8V option) VCC = 1.8V 0.2 ISB1 µA ISB2 Standby Current (2.7V option) VCC = 2.7V ISB3 Standby Current (5.0V option) VCC = 4.5 - 5.5V ILI Input Leakage Current VIN = VCC or VSS ILO Output Leakage Current VOUT = VCC or VSS VIL Input Low Level(1) VIH Input High Level(1) VOL2 Output Low Level VCC = 3.0V VOL1 Output Low Level VCC = 1.8V Note: 1. Test Condition VCC = 3.6V VCC = 5.5V Min Typ VIN = VCC or VSS 2.0 µA 0.6 VIN = VCC or VSS 6.0 6.0 µA 0.10 3.0 µA 0.05 3.0 µA -0.6 VCC x 0.3 V VCC x 0.7 VCC + 0.5 V IOL = 2.1 mA 0.4 V IOL = 0.15 mA 0.2 V VIN = VCC or VSS VIL min and VIH max are reference only and are not tested. http://www.hgsemi.com.cn 3 2018 JUN AT24C512 AC Characteristics Applicable over recommended operating range from TA = -40°C to +85°C, VCC = +1.8V to +5.5V, CL = 100 pF (unless otherwise noted). Test conditions are listed in Note 2. 1.8-volt Min Max 2.7-volt Min Symbol Parameter fSCL Clock Frequency, SCL tLOW Clock Pulse Width Low 4.7 1.3 0.6 µs tHIGH Clock Pulse Width High 4.0 1.0 0.4 µs tAA Clock Low to Data Out Valid 0.1 tBUF Time the bus must be free before a new transmission can start(1) 4.7 1.3 0.5 µs tHD.STA Start Hold Time 4.0 0.6 0.25 µs tSU.STA Start Set-up Time 4.7 0.6 0.25 µs tHD.DAT Data In Hold Time 0 0 0 µs tSU.DAT Data In Set-up Time 200 100 100 ns tR Inputs Rise Time(1) 100 (1) 4.5 Max 5.0-volt Min 400 0.05 0.9 0.05 Max Units 1000 kHz 0.55 µs 1.0 0.3 0.3 µs 300 300 100 ns tF Inputs Fall Time tSU.STO Stop Set-up Time 4.7 0.6 0.25 µs tDH Data Out Hold Time 100 50 50 ns Write Cycle Time tWR (1) Endurance Notes: 20 5.0V, 25°C, Page Mode 100K 10 100K 10 100K ms Write Cycles 1. This parameter is characterized and is not 100% tested. 2. AC measurement conditions: RL (connects to VCC): 1.3KΩ (2.7V, 5V), 10KΩ (1.8V) Input pulse voltages: 0.3VCC to 0.7VCC Input rise and fall times: ≤50ns Input and output timing reference voltages: 0.5VCC Device Operation CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time periods (refer to Data Validity timing diagram). Data changes during SCL high periods will indicate a start or stop condition as defined below. START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (refer to Start and Stop Definition timing diagram). STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the stop command will place the EEPROM in a standby power mode (refer to Start and Stop Definition timing diagram). http://www.hgsemi.com.cn 4 ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word. STANDBY MODE: The AT24C512 features a low power standby mode which is enabled: a) upon power-up and b) after the receipt of the STOP bit and the completion of any internal operations. MEMORY RESET: After an interruption in protocol, power loss or system reset, any 2-wire part can be reset by following these steps: (a) Clock up to 9 cycles, (b) look for SDA high in each cycle while SCL is high and then (c) create a start condition as SDA is high. 2018 JUN AT24C512 Bus Timing (SCL: Serial Clock, SDA: Serial Data I/O) Write Cycle Timing (SCL: Serial Clock, SDA: Serial Data I/O) (1) Note: 1. The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the internal clear/write cycle. http://www.hgsemi.com.cn 5 2018 JUN AT24C512 Data Validity Start and Stop Definition Output Acknowledge http://www.hgsemi.com.cn 6 2018 JUN AT24C512 Device Addressing data word address will “roll over” and previous data will be overwritten. The address “roll over” during write is from the last byte of the current page to the first byte of the same page. ACKNOWLEDGE POLLING: Once the internally-timed write cycle has started and the EEPROM inputs are disabled, acknowledge polling can be initiated. This involves sending a start condition followed by the device address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has completed will the EEPROM respond with a zero, allowing the read or write sequence to continue. The 512K EEPROM requires an 8-bit device address word following a start condition to enable the chip for a read or write operation (refer to Figure 1). The device address word consists of a mandatory one, zero sequence for the first five most significant bits as shown. This is common to all 2wire EEPROM devices. The 512K uses the two device address bits A1, A0 to allow as many as four devices on the same bus. These bits must compare to their corresponding hardwired input pins. The A1 and A0 pins use an internal proprietary circuit that biases them to a logic low condition if the pins are allowed to float. The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is high and a write operation is initiated if this bit is low. Upon a compare of the device address, the EEPROM will output a zero. If a compare is not made, the device will return to a standby state. DATA SECURITY: The AT24C512 has a hardware data protection scheme that allows the user to write protect the whole memory when the WP pin is at VCC. Read Operations Read operations are initiated the same way as write operations with the exception that the read/write select bit in the device address word is set to one. There are three read operations: current address read, random address read and sequential read. CURRENT ADDRESS READ: The internal data word address counter maintains the last address accessed during the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. The address “roll over” during read is from the last byte of the last memory page, to the first byte of the first page. Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an input zero but does generate a following stop condition (refer to Figure 4). RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the microcontroller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the read/write select bit high. The EEPROM acknowledges the device address and serially clocks out the data word. The microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 5). SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a random address read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will “roll over” and the sequential read will continue. The sequential read operation is terminated when the microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 6). Write Operations BYTE WRITE: A write operation requires two 8-bit data word addresses following the device address word and acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a zero. The addressing device, such as a microcontroller, then must terminate the write sequence with a stop condition. At this time the EEPROM enters an internally-timed write cycle, tWR, to the nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write is complete (refer to Figure 2). PAGE WRITE: The 512K EEPROM is capable of 128-byte page writes. A page write is initiated the same way as a byte write, but the microcontroller does not send a stop condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcontroller can transmit up to 127 more data words. The EEPROM will respond with a zero after each data word received. The microcontroller must terminate the page write sequence with a stop condition (refer to Figure 3). The data word address lower 7 bits are internally incremented following the receipt of each data word. The higher data word address bits are not incremented, retaining the memory page row location. When the word address, internally generated, reaches the page boundary, the following byte is placed at the beginning of the same page. If more than 128 data words are transmitted to the EEPROM, the http://www.hgsemi.com.cn 7 2018 JUN AT24C512 Figure 1. Device Address Figure 2. Byte Write Figure 3. Page Write Figure 4. Current Address Read http://www.hgsemi.com.cn 9 2018 JUN AT24C512 Figure 5. Random Read Figure 6. Sequential Read http://www.hgsemi.com.cn 9 2018 JUN AT24C512 Important statement: Huaguan Semiconductor Co,Ltd. reserves the right to change the products and services provided without notice. Customers should obtain the latest relevant information before ordering, and verify the timeliness and accuracy of this information. Customers are responsible for complying with safety standards and taking safety measures when using our products for system design and machine manufacturing to avoid potential risks that may result in personal injury or property damage. Our products are not licensed for applications in life support, military, aerospace, etc., so we do not bear the consequences of the application of these products in these fields. Our documentation is only permitted to be copied without any tampering with the content, so we do not accept any responsibility or liability for the altered documents. http://www.hgsemi.com.cn 9 2018 JUN