AT24C256C I2C-Compatible (2-Wire) Serial EEPROM 256-Kbit (32,768 x 8) DATASHEET Features Low-voltage and Standard-voltage Operation ̶ VCC = 1.7V to 5.5V Internally Organized as 32,768 x 8 2-wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 400kHz (1.7V) and 1MHz (2.5V, 2.7V, 5.0V) Compatibility Write Protect Pin for Hardware Protection 64-byte Page Write Mode ̶ Partial Page Writes Allowed Self-timed Write Cycle (5ms Max) High Reliability ̶ Endurance: 1,000,000 Write Cycles Data Retention: 40 Years ̶ Lead-free/Halogen-free Devices Available Green Package Options (Pb/Halide-free/RoHS Compliant) ̶ 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 8-ball VFBGA Packages Die Sale Options: Wafer Form, Waffle Pack, and Bumped Wafers Description The Atmel® AT24C256C provides 262,144-bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 32,768 words of 8 bits each. The device’s cascading feature allows up to eight 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-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 8-ball VFBGA packages. In addition, this device operates from 1.7V to 5.5V. Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 1. Pin Configurations and Pinouts Table 1-1. Pin Function A0 Address Input A1 Address Input A2 Address Input GND Ground SDA Serial Data SCL Serial Clock Input WP VCC 2. Pin Configuration Write Protect 8-lead SOIC A0 1 8 VCC A1 2 7 WP A2 3 6 SCL GND 4 SDA 5 A0 A1 A2 GND 1 8 2 7 3 6 4 5 Top View Top View 8-pad UDFN 8-ball VFBGA A0 1 8 VCC VCC 8 1 A0 A1 2 7 WP WP 7 2 A1 A2 3 6 SCL SCL 6 3 A2 GND 4 5 SDA SDA 5 4 GND Device Power Supply Top View VCC WP SCL SDA Bottom View Absolute Maximum Ratings* Operating Temperature . . . . . . . . . . .-55°C to +125°C Storage Temperature . . . . . . . . . . . -65°C to + 150°C Voltage on any pin with respect to ground . . . . . . . . . . . . . . . -1.0 V +7.0V Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V DC Output Current . . . . . . . . . . . . . . . . . . . . . . .5.0mA 2 8-lead TSSOP AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 *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 are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 3. 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 Descriptions Serial Clock (SCL): The SCL input is used to positive-edge clock data into each EEPROM device and negativeedge 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 Addresses (A2, A1, A0): The A2, A1, and A0 pins are device address inputs that are hard wired (directly to GND or to VCC) for compatibility with other Atmel AT24C devices. When the pins are hard wired, as many as eight 256K devices may be addressed on a single bus system. (Device addressing is discussed in detail in Section 7. “Device Addressing” on page 9). A device is selected when a corresponding hardware and software match is true. If these pins are left floating, the A2, A1, and A0 pins will be internally pulled down to GND. However, due to capacitive coupling that may appear during customer applications, Atmel recommends always connecting the address pins to a known state. When using a pull-up resistor, Atmel recommends using 10k or less. Write Protect (WP): The Write Protect input, when connected to GND, allows normal write operations. When WP is connected directly to VCC, all write operations to the memory are inhibited. If the pin is left floating, the WP pin will be internally pulled down to GND. However, due to capacitive coupling that may appear during customer applications, Atmel recommends always connecting the WP pins to a known state. When using a pull-up resistor, Atmel recommends using 10k or less. Table 4-1. Write Protect WP Pin Status Part of the Array Protected At VCC Full Array At GND Normal Read/Write Operations AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 3 5. Memory Organization AT24C256C, 256K Serial EEPROM: The 256K is internally organized as 512 pages of 64-bytes each. Random word addressing requires a 15-bit data word address. 5.1 Pin Capacitance Table 5-1. Pin Capacitance(1) Applicable over recommended operating range from: TA = 25°C, f = 1.0MHz, VCC = 1.7V to 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, and 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: TAI = - 40°C to +85°C, VCC = 1.7V to 5.5V (unless otherwise noted). Symbol Parameter VCC1 Supply Voltage ICC1 Supply Current VCC = 5.0V Read at 400kHz ICC2 Supply Current VCC = 5.0V Write at 400kHz ISB1 Standby Current ILI Input Leakage Current VCC = 5.0V VIN = VCC or VSS ILO Output Leakage Current VCC = 5.0V VOUT = VCC or VSS VIL Input Low Level(1) VIH Input High Level((1) VOL1 Output Low Level VCC = 1.7V VOL2 Output Low Level VCC = 3.0V Note: 4 1. Test Condition Max Units Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 Typ 5.5 V 1.0 2.0 mA 2.0 3.0 mA 1.0 A 6.0 A 0.10 3.0 A 0.05 3.0 A -0.6 VCC x 0.3 V VCC x 0.7 VCC + 0.5 V IOL = 0.15mA 0.2 V IOL = 2.1mA 0.4 V 1.7 VCC = 1.7V VCC = 5.0V VIN = VCC or VSS VIL min and VIH max are reference only and are not tested. AT24C256C [DATASHEET] Min 5.3 AC Characteristics Table 5-3. AC Characteristics (Industrial Temperature) Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = 1.7V to 5.5V, CL = 100 pF (unless otherwise noted). Test conditions are listed in Note 2. 1.7V Min 2.5V, 5.0V Symbol Parameter Max Min fSCL Clock Frequency, SCL tLOW Clock Pulse Width Low 1300 400 ns tHIGH Clock Pulse Width High 600 400 ns tI Noise Suppression Time(1) tAA Clock Low to Data Out Valid tBUF Time the bus must be free before a new transmission can start(1) 1300 500 ns tHD.STA Start Hold Time 600 250 ns tSU.STA Start Set-up Time 600 250 ns tHD.DAT Data In Hold Time 0 0 ns tSU.DAT Data In Set-up Time 100 100 ns tR Inputs Rise Time(1) 400 100 50 (1) 900 50 Max Units 1000 kHz 50 ns 550 ns 300 300 ns 300 100 ns tF Inputs Fall Time tSU.STO Stop Set-up Time 600 250 ns tDH Data Out Hold Time 50 50 ns tWR (1) Endurance Notes: 1. 2. Write Cycle Time 5 25°C, Page Mode, 3.3V 1,000,000 5 ms Write Cycles This parameter is ensured by characterization and is not 100% tested. AC measurement conditions: RL (connects to VCC): 1.3kΩ (2.5V, 5.5V), 10kΩ (1.7V) Input pulse voltages: 0.3VCC to 0.7VCC Input rise and fall times: ≤ 50ns Input and output timing reference voltages: 0.5 x VCC AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 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. 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 that 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 command will place the EEPROM in a standby power mode. Figure 6-2. Start and Stop Definition SDA SCL Start 6 AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 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: AT24C256C features a low-power standby mode that is enabled upon power-up and after the receipt of the Stop condition and the completion of any internal operations. Software Reset: After an interruption in protocol, power-loss or system reset, any 2-wire part can be protocol reset by following these steps: 1. Create a Start condition (if possible). 2. 3. Clock nine cycles. Create another Start condition followed by Stop condition as shown below. The device should be ready for the next communication after above steps have been completed. In the event that the device is still non-responsive or remains active on the SDA bus, a power cycle must be used to reset the device. Figure 6-4. Software Reset Dummy Clock Cycles SCL 1 Start Condition 2 3 8 9 Start Condition Stop Condition SDA AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 7 Figure 6-5. Bus Timing 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 SDA 8th Bit ACK WORDN tWR Stop Condition Note: 8 1. (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. AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 7. Device Addressing The 256K EEPROM requires an 8-bit device address word following a start condition to enable the chip 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. Figure 7-1. 1 MSB Device Addressing 0 1 0 A2 A1 A0 R/W LSB The next three bits are the A2, A1, and A0 device address bits to allow as many as eight devices on the same bus. These bits must compare to their corresponding hard wired 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 a standby state. Data Security: The AT24C256C has a hardware data protection scheme that allows the user to write protect the whole memory when the WP pin is at VCC. AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 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. The addressing device, such as a microcontroller, must then 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 Device Address W R I T E First Word Address Second Word Address S T O P Data SDA Line M S B Note: R A / C W K A C K A C K A C K * = Don’t care bit Page Write: The 256K EEPROM is capable of 64-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 63 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 . Figure 8-2. Page Write S T A R T Device Address W R I T E First Word Address Second Word Address Data (n) S T O P Data (n + x) SDA Line M S B Note: R A / C WK A C K A C K A C K A C K * = Don’t care bit The data word address lower six 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 64 data words are transmitted to the EEPROM, the data word address will roll-over and the 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. 10 AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 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 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. Figure 9-1. Current Address Read S T A R T R E A D Device Address S T O P Data SDA Line M S B N O R A / C 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 First Word Address S T A R T Second Word Address Device Address R E A D S T O P Data (n) SDA LINE M S B R A / C W K A C K L A S C B K R A / C WK A C K Dummy Write Note: N O * = Don’t care bit AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 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 S T A R T Device Address W R I T E First Word Address Second Word Address ... SDA LINE M S B R A / C W K L A S C B K A C K Dummy Write S T A R T Device Address R E A D Data (n) Data (n + 1) Data (n + 2) S T O P Data (n + x) ... R A / C WK A C K A C K A C K N O A C K Note: 12 * = Don’t care bit AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 10. Ordering Code Detail AT 2 4 C 2 5 6 C - S S H L - B Atmel Designator Product Family 24C = Standard I2C-compatible Serial EEPROM Device Density 256 = 256K Shipping Carrier Option B T E = Bulk (Tubes) = Tape and Reel, Standard Quantity Option = Tape and Reel, Expanded Quantity Option Operating Voltage L = 1.7V to 5.5V Package Device Grade or Wafer/Die Thickness H Device Revision = Green, NiPdAu Lead Finish, Industrial Temperature Range (-40°C to +85°C) U = Green, Matte Sn Lead Finish, Industrial Temperature Range (-40°C to +85°C) 11 = 11mil wafer thickness Package Option SS X MA C WWU WDT = = = = = = JEDEC SOIC TSSOP UDFN VFBGA Wafer Unsawn Die in Tape and Reel AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 13 11. Part Markings AT24C256C: Package Marking Information 8-lead TSSOP 8-lead SOIC ATMLHYWW 2ECL @ AAAAAAAA 8-lead UDFN 8-ball VFBGA 2.0 x 3.0 mm Body 2.35 x 3.73 mm Body 2EC [email protected] YXX Note 1: ATHYWW 2ECL @ AAAAAAA 2ECU @YMXX designates pin 1 Note 2: Package drawings are not to scale Catalog Number Truncation AT24C256C Truncation Code ###: 2EC Date Codes Y = Year 2: 2012 3: 2013 4: 2014 5: 2015 Voltages 6: 2016 7: 2017 8: 2018 9: 2019 M = Month A: January B: February ... L: December WW = Work Week of Assembly 02: Week 2 04: Week 4 ... 52: Week 52 Country of Assembly Lot Number @ = Country of Assembly AAA...A = Atmel Wafer Lot Number Trace Code L: 1.7V min Grade/Lead Finish Material U: Industrial/Matte Tin H: Industrial/NiPdAu Atmel Truncation XX = Trace Code (Atmel Lot Numbers Correspond to Code) Example: AA, AB.... YZ, ZZ AT: Atmel ATM: Atmel ATML: Atmel 6/5/12 TITLE Package Mark Contact: [email protected] 14 24C256CSM, AT24C256C Package Marking Information AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 DRAWING NO. REV. 24C256CSM C 12. Ordering Information Delivery Information Atmel Ordering Code Lead Finish Package Form Quantity Bulk (Tubes) 100 per Tube Tape and Reel 4,000 per Reel Bulk (Tubes) 100 per Tube Tape and Reel 5,000 per Reel Tape and Reel 5,000 per Reel Tape and Reel 15,000 per Reel Tape and Reel 5,000 per Reel AT24C256C-SSHL-B Operating Range 8S1 AT24C256C-SSHL-T AT24C256C-XHL-B AT24C256C-XHL-T 8X NiPdAu (Lead-free/Halogen-free) AT24C256C-MAHL-T Industrial Temperature (-40°C to 85°C) 8MA2 AT24C256C-MAHL-E AT24C256C-CUL-T AT24C256C-WWU11L(1) Note: 1. 8U2-1 N/A Wafer Sale Note 1 Contact Atmel Sales for Wafer sales. Package Type 8S1 8-lead, 0.150” wide, Plastic Gull Wing Small Outline (JEDEC SOIC) 8X 8-lead, 4.40mm body, Plastic Thin Shrink Small Outline Package (TSSOP) 8MA2 8-pad, 2.00mm x 3.00mm body, 0.50mm pitch, Dual No Lead (UDFN) 8U2-1 8-ball, Die Ball Grid Array Package (VFBGA) AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 15 13. Packaging Information 13.1 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: [email protected] 16 TITLE 8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing Small Outline (JEDEC SOIC) AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 GPC SWB DRAWING NO. REV. 8S1 G 13.2 8X — 8-lead TSSOP C 1 Pin 1 indicator this corner E1 E L1 N L Top View End View A b A1 e D SYMBOL Side View Notes: COMMON DIMENSIONS (Unit of Measure = mm) A2 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 protected] 8X, 8-lead 4.4mm Body, Plastic Thin Shrink Small Outline Package (TSSOP) GPC TNR DRAWING NO. 8X AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 REV. E 17 13.3 8MA2 — 8-pad UDFN E 1 8 Pin 1 ID 2 7 3 6 4 5 D C TOP VIEW A2 SIDE VIEW A A1 E2 b (8x) 8 7 1 D2 6 3 5 4 e (6x) K L (8x) BOTTOM VIEW Notes: COMMON DIMENSIONS (Unit of Measure = mm) 2 Pin#1 ID 1. This drawing is for general information only. Refer to Drawing MO-229, for proper dimensions, tolerances, datums, etc. 2. The Pin #1 ID is a laser-marked feature on Top View. 3. Dimensions b applies to metallized terminal and is measured between 0.15 mm and 0.30 mm from the terminal tip. If the terminal has the optional radius on the other end of the terminal, the dimension should not be measured in that radius area. 4. The Pin #1 ID on the Bottom View is an orientation feature on the thermal pad. SYMBOL MIN NOM MAX A 0.50 0.55 0.60 A1 0.0 0.02 0.05 A2 - - 0.55 D 1.90 2.00 2.10 D2 1.40 1.50 1.60 E 2.90 3.00 3.10 E2 1.20 1.30 1.40 b 0.18 0.25 0.30 C L 3 1.52 REF 0.30 e K NOTE 0.35 0.40 0.50 BSC 0.20 - - 11/26/14 Package Drawing Contact: [email protected] 18 AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 TITLE 8MA2, 8-pad 2 x 3 x 0.6mm Body, Thermally Enhanced Plastic Ultra Thin Dual Flat No-Lead Package (UDFN) GPC DRAWING NO. REV. YNZ 8MA2 G 13.4 8U2-1 — 8-ball VFBGA f 0.10 C d 0.10 A1 BALL PAD CORNER D A (4X) d 0.08 C C A1 BALL PAD CORNER 2 1 Øb A j n0.15 m C A B j n0.08 m C B e E C D (e1) B A1 d A2 (d1) A TOP VIEW BOTTOM VIEW SIDE VIEW 8 SOLDER BALLS COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL Notes: 1. This drawing is for general 2. Dimension 'b' is measured at the maximum solder ball diameter. 3. Solder ball composition shall be 95.5Sn-4.0Ag-.5Cu. A A1 A2 b D E e e1 d d1 MIN 0.81 0.15 0.40 0.25 NOM 0.91 0.20 0.45 0.30 2.35 BSC 3.73 BSC 0.75 BSC 0.74 REF 0.75 BSC 0.80 REF MAX NOTE 1.00 0.25 0.50 0.35 6/11/13 TITLE Package Drawing Contact: [email protected] 8U2-1, 8-ball, 2.35 x 3.73 mm Body, 0.75 mm pitch, Very Thin, Fine-Pitch Ball Grid Array Package (VFBGA) GPC DRAWING NO. GWW 8U2-1 AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 REV. G 19 14. Revision History Doc. Rev. Date Comments Add the UDFN Expanded Quantity Option. 8568F 01/2015 Update 8X, 8MA2, and 8U2-1 package outline drawings, the ordering information section, and the disclaimer page. Update template and Atmel logo. 8568E 08/2012 Correct 8-lead UDFN to 8-pad UDFN. Update AC characteristics from μs to ns units and their respective values. Update part marking description. 20 Atmel global device marking alignment. 8568D 09/2011 8568C 05/2010 Update 8S1 and 8A2 package drawings. 8568B 03/2010 Part Markings and ordering detail/codes updated. 8568A 09/2009 Initial document release. Update 8S1, 8A2 to 8X, 8MA2, and 8U2-1 package drawings. AT24C256C [DATASHEET] Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015 XXXXXX Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com © 2015 Atmel Corporation. / Rev.: Atmel-8568F-SEEPROM-AT24C256C-Datasheet_012015. 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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