AT24C64B 2-Wire Automotive Serial EEPROM 64-Kbit (8,192 x 8) DATASHEET Features Standard-Voltage Operation ̶ 2.7 (VCC = 2.7V to 5.5V) Internally Organized 8,192 x 8 (64K) Automotive Temperature Range –40C to +125C 2-Wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 400kHz Clock Rate Write Protect Pin for Hardware Data Protection 32-byte Page Write Mode (Partial Page Writes Allowed) Self-timed Write Cycle (5ms Max) High Reliability ̶ ̶ Endurance: 1,000,000 Write Cycles Data Retention: 100 Years Lead-free/Halogen-free Devices Available 8-lead JEDEC SOIC and 8-lead TSSOP Packages Description The Atmel® AT24C64B provides 65,536 bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 8,192 words of 8 bits each. The device’s cascadable feature allows up to eight devices to share a common 2-wire bus. The device is optimized for use in many automotive applications where low power and low voltage operation are essential. The AT24C64B is available in space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via a 2-wire serial interface and is available in a 2.7V (2.7V to 5.5V) version. Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 1. Pin Configurations and Pinouts Figure 1. Pin Name 2. Pin Configurations Function A0 – A2 Address Inputs GND Ground VCC Power Supply WP Write Protect SCL Serial Clock Input SDA Serial Data 8-lead TSSOP (Top View) (Top View) A0 1 8 VCC A1 2 7 WP A0 A1 A2 GND A2 3 6 SCL GND 4 5 SDA Note: Drawings are not to scale. 1 2 3 4 8 7 6 5 VCC WP SCL SDA Absolute Maximum Ratings* Operating Temperature . . . . . . . . . . –55C to +125C Storage Temperature . . . . . . . . . . . . –65C to +150C Voltage on Any Pin with Respect to Ground . . . . . . . . . . . . –1.0V to +7.0V Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V DC Output Current . . . . . . . . . . . . . . . . . . . . . . .5.0mA 2 8-lead SOIC AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 *Notice: 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. 3. Block Diagram Figure 3-1. Block Diagram VCC GND WP Start Stop Logic Serial Control Logic LOAD Device Address Comparator A2 A1 A0 R/W EN H.V. Pump/Timing COMP LOAD Data Word ADDR/Counter Y DEC Data Recovery INC X DEC SCL SDA EEPROM Serial MUX DOUT/ACK Logic DIN DOUT 4. 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 Address (A2, A1, and A0): The A2, A1, and A0 pins are device address inputs that are hardwired or left not connected for hardware compatibility with other AT24Cxx devices. When the pins are hardwired, as many as eight 64K devices may be addressed on a single bus system (see Section 7., “Device Addressing”). If the pins are left floating, the A2, A1, and A0 pins will internally be pulled down to Ground (GND) if the capacitive coupling to the circuit board VCC plane is less than 3pF. If coupling is greater than 3pF, Atmel recommends connecting the address pins to GND. Write Protect (WP): The Write Protect input, when connected to GND, allows normal write operations. When WP is connected high to VCC, all write operations to upper quadrant of the memory are inhibited. If the pin is left floating, the WP pin will be internally pulled down to GND if the capacitive coupling to the circuit board VCC plane is less than 3pF. If coupling is greater than 3pF, Atmel recommends connecting the pin to GND. Switching WP to VCC prior to a write operation creates a software write protect function. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 3 5. Memory Organization AT24C64B, 64K Serial EEPROM: The 64K is internally organized as 256 pages of 32 bytes each. Random word addressing requires a 13-bit data word address. 5.1 Pin Capacitance Table 5-1. Pin Capacitance(1) Applicable over recommended operating range from TA = 25C, f = 1.0MHz, VCC = 5.5V. Symbol Test Condition CI/O CIN Note: 5.2 1. Max] Units Conditions Input/Output Capacitance (SDA) 8 pF VI/O = 0V Input Capacitance (A0, A1, A2, SCL) 6 pF VIN = 0V This parameter is characterized and is not 100% tested. DC Characteristics Table 5-2. DC Characteristics Applicable over recommended operating range from: TA = -40C to +125C, VCC = +2.7V to +5.5V (unless otherwise noted). Symbol Parameter VCC3 Supply Voltage ICC1 Supply Current VCC = 5.0V Read at 400kHz ICC2 Supply Current VCC = 5.0V Write at 400kHz ISB Standby Current ILI Input Leakage Current ILO Output Leakage Current VIL(1) Input Low Level VIH(1) Input High Level VOL2 Output Low Level VCC = 3.0V VOL1 Output Low Level VCC = 1.8V Note: 4 1. Test Condition Min Max Units 5.5 V 0.4 1.0 mA 2.0 3.0 mA 1.0 3.0 3.0 5.0 VIN = VCC or VSS 0.10 3.0 μA VOUT = VCC or VSS 0.05 3.0 μA -0.6 VCC x 0.3 V VCC x 0.7 VCC + 0.5 V IOL = 2.1mA 0.4 V IOL = 0.15mA 0.2 V 2.7 VCC = 2.7V VCC = 5.0V VIN = VCC or VSS VIL min and VIH max are reference only and are not tested. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 Typ μA 5.3 AC Characteristics Table 5-3. AC Characteristics Applicable over recommended operating range from TA = -40C to +125C, VCC = +2.7V to +5.5V, CL = 1 TTL Gate and 100pF (unless otherwise noted). Symbol Parameter Min fSCL Clock Frequency, SCL tLOW Clock Pulse Width Low 1.2 μs tHIGH Clock Pulse Width High 0.6 μs tI Noise Suppression Time(1) tAA Clock Low to Data Out Valid 0.1 (1) Max Units 400 kHz 50 ns 0.9 μs tBUF Time the bus must be free before a new transmission can start 1.2 μs tHD.STA Start Hold Time 0.6 μs tSU.STA Start Set-up Time 0.6 μs tHD.DAT Data In Hold Time 0 μs tSU.DAT Data In Set-up Time 100 ns tR(1) Inputs Rise Time 0.3 μs tF(1) Inputs Fall Time 300 ns tSU.STO Stop Set-up Time 0.6 μs tDH Data Out Hold Time 50 ns tWR Write Cycle Time Endurance(1) 5.0V, 25C, Page Mode Note: 1. 5 1,000,000 ms Write Cycles This parameter is ensured by characterization only. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 5 6. 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 (see to Data Validity timing diagram). Data changes during SCL high periods will indicate a Start or Stop condition as defined below. Figure 6-1. Data Validity SDA SCL Data Stable Data Stable Data Change Start Condition: A high-to-low transition of SDA with SCL high is a Start condition which must precede any other command. Stop Condition: A low-to-high transition of SDA with SCL high is a Stop condition. After a read sequence, the Stop condition will place the EEPROM in a standby power mode. Figure 6-2. Start and Stop Definition SDA SCL Start 6 AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 Stop 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. Figure 6-3. Output Acknowledge 1 SCL 8 9 Data In Data Out Acknowledge Start Standby Mode: The AT24C64B features a low power standby mode which is enabled: Upon power-up. After the receipt of the Stop condition 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: Clock up to nine cycles, Look for SDA high in each cycle while SCL is high, and Create a Start condition as SDA is high. The device is ready for the next communication after above steps have been completed. Figure 6-4. Memory Reset Dummy Clock Cycles SCL 1 Start Condition 2 3 8 9 Start Condition Stop Condition SDA AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 7 Figure 6-5. Bus Timing — SCL: Serial Clock, SDA: Serial Data I/O tHIGH tF tR tLOW tLOW SCL tSU.STA tHD.STA tHD.DAT tSU.DAT tSU.STO SDA In tAA tDH tBUF SDA Out Figure 6-6. Write Cycle Timing — SCL: Serial Clock, SDA: Serial Data I/O SCL 8th bit SDA ACK WORDn tWR(1) Stop Condition Note: 8 1. Start Condition 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. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 7. Device Addressing The 64K EEPROM requires an 8-bit device address word following a Start condition to enable the device for a Read or Write operation. The device address word consists of a mandatory one, zero sequence for the first four most significant bits as shown. This is common to all 2-wire EEPROM devices. The 64K uses the three device address bits A2, A1, and A0 to allow as many as eight devices on the same bus. These bits must compare to their corresponding hardwired input pins. The A2, 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 standby state. Noise Protection: Special internal circuitry placed on the SDA and SCL pins prevent small noise spikes from activating the device. Data Security: The AT24C64B has a hardware data protection scheme that allows the user to write protect the upper quadrant of memory when the WP pin is at VCC. Figure 7-1. 64K 1 MSB Device Address 0 1 0 A2 A1 A0 R/W LSB AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 9 8. 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 and the addressing device, such as a microcontroller, 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. Figure 8-1. Byte Write S T A R T W R I T E Device Address First Word Address Second Word Address S T O P Data SDA LINE M S B Note: 1. L R A S / C BW K A C K A C K L A S C B K * = Don’t care bit. Page Write: The 64K EEPROM is capable of 32-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 31 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. The data word address lower five 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 32 data words are transmitted to the EEPROM, the data word address will roll-over and previous data will be overwritten. Figure 8-2. Page Write S T A R T Device Address W R I T E First Word Address (n) Second Word Address (n) Data (n) S T O P Data (n + x) SDA Line M S B Note: 1. L R A S / C BWK A C K A C K A C K A C K * = Don’t care bit. 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. 10 AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 9. 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 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 device 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. The address roll-over during write is from the last byte of the current page to the first byte of the same 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. Figure 9-1. Current Address Read S T A R T Device Address R E A D S T O P Data SDA Line M S B N O L R A S / C B WK A C K 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. Figure 9-2. Random Read S T A R T Device Address W R I T E S T A R T 1st, 2nd Word Address (n) Device Address R E A D S T O P Data (n) SDA Line M S B LR A S / C BW K Dummy Write Note: 1. A C K A C K N O A C K * = Don’t care bit. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 11 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. Figure 9-3. Sequential Read Device Address R E A D Data (n) A C K Data (n + 1) A C K Data (n + 2) A C K S T O P Data (n + x) SDA Line R A / C WK 10. N O A C K Power Recommendation The device internal POR (Power-On Reset) threshold is just below the minimum operating voltage of the device. Power shall rise monotonically from 0.0Vdc to full VCC in less than 1ms. Hold at full VCC for at least 100μs before the first operation. Power shall drop from full VCC to 0.0Vdc in less than 1ms. Power dropping to a non-zero level and then slowly going to zero is not recommended. Power shall remain off (0.0Vdc) for 0.5s minimum. Please consult Atmel if your power conditions do not meet the above recommendations. 12 AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 11. Ordering Code Detail A T 2 4 C 6 4 B N - 1 0 S Q - 2.7 Atmel Designator Operating Voltage M = 2.7V to 5.5V Product Family 24C = 2-Wire Compatible Serial EEPROM Device Density Package Device Grade Q = Lead-free/Halogen-free Automotive Temperature Range (-40°C to +125°C) 64 = 64 kilobit Package Option Device Revision Package Variation (Package Type Dependant) N = 0.150” width SOIC S = JEDEC SOIC T = TSSOP Speed Type 10 = Default Value Note: This field is not used for Serial EEPROM products. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 13 12. Product Markings AT24C64B Automotive Package Marking Information 8-lead TSSOP 8-lead SOIC ATMELYWW 24C64BN SQ%% D Q% D AT### Note: Lot Number, location of assembly and YWW date code on the bottom side of the package. Note: Lot Number and location of assembly on the bottom side of the package. Note 1: designates pin 1 Note 2: Package drawings are not to scale Catalog Number Truncation AT24C64B Truncation Code ###: 64B Date Codes Y = Year 4: 2014 5: 2015 6: 2016 7: 2017 Voltages 8: 2018 9: 2019 0: 2020 1: 2021 M = Month A: January B: February ... L: December WW = Work Week of Assembly 02: Week 2 04: Week 4 ... 52: Week 52 % = Minimum Voltage 3 or 27: 2.7V min Country of Assembly Lot Number Grade/Lead Finish Material @ = Country of Assembly AAA...A = Atmel Wafer Lot Number Q: Trace Code Automotive /Matte Tin/SnAgCu Atmel Truncation XX = Trace Code (Atmel Lot Numbers Correspond to Code) Example: AA, AB.... YZ, ZZ AT: Atmel ATM: Atmel ATML: Atmel 6/12/14 TITLE Package Mark Contact: DL-CSO-Assy_eng@atmel.com 14 24C64BAM, AT24C64B Automotive Package Marking Information AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 DRAWING NO. REV. 24C64BAM C 13. Ordering Information(1) Atmel Ordering Code AT24C64BN-10SQ-2.7(2) AT24C64B-10TQ-2.7 Notes: 1. 2. (2) Lead Finish Package Matte Tin (Lead-free/Halogen-free) 8S1 8X Voltage Operation Range 2.7V to 5.5V Automotive Temperature (-40C to +125C) For 2.7V devices used in the 4.5V to 5.5V range, please refer to performance values in the AC and DC characteristics tables. “Q” designates green package and RoHS compliant. Package Type 8S1 8-lead, 0.150" wide body, Plastic Gull Wing Small Outline (JEDEC SOIC) 8X 8-lead, 4.4mm body, Plastic Thin Shrink Small Outline Package (TSSOP) AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 15 14. Package Drawings 14.1 8S1 — 8-lead JEDEC SOIC C 1 E E1 L N Ø TOP VIEW END VIEW e b COMMON DIMENSIONS (Unit of Measure = mm) A A1 D SIDE VIEW Notes: This drawing is for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc. SYMBOL MIN A 1.35 NOM MAX – 1.75 A1 0.10 – 0.25 b 0.31 – 0.51 C 0.17 – 0.25 D 4.80 – 5.05 E1 3.81 – 3.99 E 5.79 – 6.20 e NOTE 1.27 BSC L 0.40 – 1.27 Ø 0° – 8° 6/22/11 Package Drawing Contact: firstname.lastname@example.org 16 TITLE 8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing Small Outline (JEDEC SOIC) AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 GPC SWB DRAWING NO. REV. 8S1 G 14.2 8X — 8-lead TSSOP C 1 Pin 1 indicator this corner E1 E L1 N L Top View End View A b A1 e COMMON DIMENSIONS (Unit of Measure = mm) A2 D SYMBOL Side View Notes: 1. This drawing is for general information only. Refer to JEDEC Drawing MO-153, Variation AA, for proper dimensions, tolerances, datums, etc. 2. Dimension D does not include mold Flash, protrusions or gate burrs. Mold Flash, protrusions and gate burrs shall not exceed 0.15mm (0.006in) per side. 3. Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed 0.25mm (0.010in) per side. 4. Dimension b does not include Dambar protrusion. Allowable Dambar protrusion shall be 0.08mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and adjacent lead is 0.07mm. 5. Dimension D and E1 to be determined at Datum Plane H. MIN NOM MAX A - - 1.20 A1 0.05 - 0.15 A2 0.80 1.00 1.05 D 2.90 3.00 3.10 2, 5 E NOTE 6.40 BSC E1 4.30 4.40 4.50 3, 5 b 0.19 0.25 0.30 4 e L 0.65 BSC 0.45 L1 C 0.60 0.75 1.00 REF 0.09 - 0.20 2/27/14 TITLE Package Drawing Contact: email@example.com GPC 8X, 8-lead 4.4mm Body, Plastic Thin Shrink Small Outline Package (TSSOP) TNR DRAWING NO. 8X AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 REV. E 17 15. 18 Revision History Revision Date Comments 8778B 08/2014 Add the sections, power recommendation and ordering code detail. Updated part markings, template, logos, and disclaimer page. No changes to functional specification. 8778A 09/2011 Initial document release. AT24C64B Automotive [DATASHEET] Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014 XXXXXX Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com © 2014 Atmel Corporation. / Rev.: Atmel-8778B-SEEPROM-AT24C64B-Auto-Datasheet_082014. Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®,and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. 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