FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM General Description Features FM24C256 is a 256Kbit CMOS non-volatile serial EEPROM organized as 32K x 8 bit memory. This device confirms to Extended IIC 2-wire protocol that allows accessing of memory in excess of 16Kbit on an IIC bus. This serial communication protocol uses a Clock signal (SCL) and a Data signal (SDA) to synchronously clock data between a master (e.g. a microcontroller) and a slave (EEPROM). FM24C256 is designed to minimize pin count and simplify PC board layout requirements. ■ Extended operating voltage: 2.7V to 5.5V FM24C256 offers hardware write protection where by the entire memory array can be write protected by connecting WP pin to V The entire memory then becomes unalterable until the WP pin is switched to V SS. ■ Up to 400 KHz clock frequency at 2.7V to 5.5V ■ Low power consumption — 0.5mA active current typical — 10µA standby current typical — 1µA standby current typical (L version) — 0.1µA standby current typical (LZ version) ■ Schmitt trigger inputs ■ 64 byte page write mode CC. ■ Self timed write cycle (6ms max) ■ Hardware Write Protection for the entire array “LZ” and “L” versions of FM24C256 offer very low standby current making them suitable for low power applications. This device is offered in SO and DIP packages. ■ Endurance: up to 100K data changes Fairchild EEPROMs are designed and tested for applications requiring high endurance, high reliability and low power consumption. ■ Temperature range — Commercial: 0 °C to +70°C — Industrial (E): -40 °C to +85°C — Automotive (V): -40 °C to +125 °C ■ Data Retention: Greater than 40 years ■ Packages: 8-Pin DIP and 8-Pin SO Block Diagram VSS WRITE LOCKOUT VCC H.V. GENERATION TIMING &CONTROL WP START STOP LOGIC SDA CONTROL LOGIC SLAVE ADDRESS REGISTER & COMPARATOR SCL XDEC A2 A1 A0 E2PROM ARRAY WORD ADDRESS COUNTER R/W YDEC CK DATA REGISTER DIN © 2001 Fairchild Semiconductor Corporation FM24C256 Rev. D.1 1 DOUT www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM November 2001 FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Connection Diagram Dual-in-Line Package (N) and SO Package (M8) A0 1 A1 2 8 VCC 7 WP FM24C256 A2 3 6 SCL VSS 4 5 SDA See Package Number N08E and M08A Pin Names VSS Ground SDA Serial Data I/O SCL Serial Clock Input WP Write Protect VCC Power Supply A0, A1, A2 Device Address Inputs 2 FM24C256 Rev. D.1 www.fairchildsemi.com FM 24 C XX F LZ E YY X Letter Description Blank X Tube Tape and Reel N M8 8-pin DIP 8-pin SOIC Temp. Range Blank E V 0 to 70 °C -40 to +85 °C -40 to +125 °C Voltage Operating Range Blank L LZ 4.5V to 5.5V 2.7V to 5.5V 2.7V to 5.5V and <1µA Standby Current SCL Clock Frequency Blank F 100KHz 400KHz 256 256K with write protect Package Density Interface 3 FM24C256 Rev. D.1 C CMOS 24 IIC - 2 Wire FM Fairchild Non-Volatile Memory www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Ordering Information Operating Conditions Absolute Maximum Ratings –65°C to +150 °C Ambient Storage Temperature All Input or Output Voltages with Respect to Ground 6.5V to –0.3V Lead Temperature (Soldering, 10 seconds) +300°C ESD Rating Ambient Operating Temperature FM24C256 FM24C256E FM24C256V 0°C to +70 °C -40°C to +85 °C -40°C to +125 °C Positive Power Supply FM24C256 FM24C256L FM24C256LZ 2000V min. 4.5V to 5.5V 2.7V to 5.5V 2.7V to 5.5V Standard VCC (4.5V to 5.5V) DC Electrical Characteristics Symbol Parameter Test Conditions Min Limits Typ (Note 1) Max 0.5 1.0 f SCL = 400 KHz f SCL = 100 KHz Units ICCA Active Power Supply Current ISB Standby Current VIN = GND or V CC 10 50 µA ILI Input Leakage Current VIN = GND to V CC 0.1 1 µA ILO Output Leakage Current VOUT = GND to V CC 0.1 1 µA VIL Input Low Voltage –0.3 VCC x 0.3 V VIH Input High Voltage VCC x 0.7 VCC + 0.5 V VOL Output Low Voltage 0.4 V IOL = 2.1 mA mA Low VCC (2.7V to 5 .5V) DC Electrical Characteristics Symbol Parameter Test Conditions Min ICCA Limits Typ (Note 1) Max Units Active Power Supply Current f SCL = 400 KHz f SCL = 100 KHz 0.5 1.0 mA Standby Current VIN = GND or V CC 1 0.1 10 10 1 50 µA µA µA ILI Input Leakage Current VIN = GND to V CC 0.1 1 µA VOUT = GND to V CC ISB (Note 3) VCC = 2.7V - 4.5V (L) VCC = 2.7V - 4.5V (LZ) VCC = 4.5V - 5.5V ILO Output Leakage Current 1 µA VIL Input Low Voltage –0.3 VCC x 0.3 V VIH Input High Voltage VCC x 0.7 VCC + 0.5 V VOL Output Low Voltage 0.4 V 0.1 IOL = 2.1 mA Capacitance TA = +25°C, f = 100/400 KHz, V CC = 5V (Note 2) Symbol Test Conditions Max Units CI/O Input/Output Capacitance (SDA) VI/O = 0V 8 pF CIN Input Capacitance (A0, A1, A2, SCL) VIN = 0V 6 pF Note 1: Typical values are T A = 25°C and nominal supply voltage (5V). Note 2: This parameter is periodically sampled and not 100% tested. Note 3: The "L" and "LZ" versions can be operated in the 2.7V to 5.5V V CC range. However the I SB values for L and LZ are applicable only when V 4 FM24C256 Rev. D.1 CC is in the 2.7V to 4.5V range. www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Product Specifications AC Testing Input/Output Waveforms Input Pulse Levels VCC x 0.1 to V CC x 0.9 0.9VCC 0.7VCC Input Rise and Fall Times 10 ns 0.1VCC 0.3VCC Input & Output Timing Levels VCC x 0.3 to V CC x 0.7 Output Load 1 TTL Gate and C L = 100 pF Read and Write Cycle Limits (Standard and Low VCC Range 2.7V - 5.5V) Symbol f SCL TI Parameter 100 KHz Min Max 400 KHz Min Max Units SCL Clock Frequency 100 400 KHz Noise Suppression Time Constant at SCL, SDA Inputs (Minimum V IN Pulse width) 100 50 ns 0.9 µs tAA SCL Low to SDA Data Out Valid 0.3 tBUF Time the Bus Must Be Free before a New Transmission Can Start 4.7 3.5 0.1 1.3 µs Start Condition Hold Time 4.0 0.6 µs tLOW Clock Low Period 4.7 1.5 µs tHIGH Clock High Period 4.0 0.6 µs t SU:STA Start Condition Setup Time (for a Repeated Start Condition) 4.7 0.6 µs tHD:DAT Data in Hold Time 0 0 ns tSU:DAT Data in Setup Time 250 120 ns tHD:STA tR SDA and SCL Rise Time 1 0.3 µs tF SDA and SCL Fall Time 300 300 ns t SU:STO Stop Condition Setup Time t DH Data Out Hold Time t WR Write Cycle Time 4.7 µs 0.6 `100 50 6 ns 6 ms Note 4: The write cycle time (t WR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. During the write cycle, the FM24C256 bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pull-up resistor, and the device does not respond to its slave address. Refer "Write Cycle Timing" diagram. Bus Timing tR tF tHIGH tLOW tLOW SCL tSU:STA SDA tHD:DAT tHD:STA tSU:DAT IN tSU:STO tBUF tAA tDH SDA OUT 5 FM24C256 Rev. D.1 www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM AC Test Conditions SCL SDA 8th BIT ACK WORD n tWR STOP CONDITION Note: The write cycle time (t START CONDITION WR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. Typical System Configuration VCC VCC SDA SCL Master Transmitter/ Receiver Note: Slave Receiver Slave Transmitter/ Receiver Due to open drain configuration of SDA and SCL, a bus-level pull-up resistor is called for, (typical value = 4.7k 6 FM24C256 Rev. D.1 Master Transmitter/ Receiver Master Transmitter Ω) www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Write Cycle Timing Device Type Extended IIC specification is an extension of Standard IIC specification to allow addressing of EEPROMs with more than 16Kbits of memory on an IIC bus. The difference between the two specifications is that Extended IIC specification defines two bytes of “Array Address” information while Standard IIC specification defines only one. All other aspects are identical between the two specifications. Using two bytes of Array Address and 3 address signals (A2, A1 and A0), it is now possible to address up to 4 Mbits (28 * 28 * 23 * 8 = 4 Mbits) of memory on an IIC bus. IIC bus is designed to support a variety of devices such as RAMs, EPROMs etc., along with EEPROMS. Hence to properly identify various devices on the IIC bus, a 4-bit “Device Type” identifier string is used. For EEPROMS, this 4-bit string is 1-0-1-0. Every IIC device on the bus internally compares this 4-bit string to its own “Device Type” string to ensure proper device selection. Device/Page Block Selection When multiple devices of the same type (e.g. multiple EEPROMS) are present on the IIC bus, then the A2, A1 and A0 address information bits are used in device selection. Every IIC device on the bus internally compares this 3-bit string to its own physical configuration (A2, A1 and A0 pins) to ensure proper device selection. This comparison is in addition to the “Device Type” comparison. Note that due to format difference, it is not possible to have peripherals which follow Standard IIC specification (e.g. 16K bit EEPROM) and peripherals which follow Extended IIC specification (e.g. 256K bit EEPROM) on a common IIC bus. IIC bus allows synchronous bi-directional communication between a TRANSMITTER and a RECEIVER using a Clock signal (SCL) and a Data signal (SDA). Additionally there are up to three Address signals (A2, A1 and A0) which collectively serve as “chip select signal” to a device (e.g. EEPROM) on the bus. In addition to selecting an EEPROM, these 3 bits are also used to select a “page block” within the selected EEPROM. Each page block is 512Kbit (64 K Bytes) in size. If an EEPROM contains more than one page bock then the selection of a page block within the EEPROM is by using A2, A1 and A0 bits. All communication on the IIC bus must be started with a valid START condition (by a MASTER), followed by transmittal (by the MASTER) of byte(s) of information (Address/Data). For every byte of information received, the addressed RECEIVER provides a valid ACKNOWLEDGE pulse to further continue the communication unless the RECEIVER intends to discontinue the communication. Depending on the direction of transfer (Write or Read), the RECEIVER can be a SLAVE or the MASTER. A typical IIC communication concludes with a STOP condition (by the MASTER). Read/Write Bit Last bit of the Slave Address indicates if the intended access is Read or Write. If the bit is "1," then the access is Read, whereas if the bit is "0," then the access is Write. Acknowledge Acknowledge is an active LOW pulse on the SDA line driven by an addressed receiver to the addressing transmitter to indicate receipt of 8-bits of data. The receiver provides an ACK pulse for every 8-bits of data received. This handshake mechanism is done as follows: After transmitting 8-bits of data, the transmitter releases the SDA line and waits for the ACK pulse. The addressed receiver, if present, drives the ACK pulse on the SDA line during the 9th clock and releases the SDA line back (to the transmitter). Refer Figure 3 . Addressing an EEPROM memory location involves sending a command string with the following information: [DEVICE TYPE]—[DEVICE/PAGE BLOCK SELECTION]—[R/W BIT]—[ARRAY ADDRESS#1]—[ARRAY ADDRESS#0] Slave Address Slave Address is an 8-bit information consisting of a Device type field (4bits), Device/Page block selection field (3bits) and Read/ Write bit (1bit). Array Address#1 This is an 8-bit information containing the most significant 8-bits of 16-bit memory array address of a location to be selected within a page block of the device. Slave Address Format Device Type Identifier 1 0 1 Array Address#0 Device/Page Block Selection 0 A2 A1 A0 This is an 8-bit information containing the least significant 8-bits of 16-bit memory array address of a location to be selected within a page block of the device. R/W (LSB) 7 FM24C256 Rev. D.1 www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Background Information (IIC Bus) Device Operation Serial Clock (SCL) SDA is a bi-directional pin used to transfer data into and out of the device. It is an open drain output and may be wire–ORed with any number of open drain or open collector outputs. The FM24C256 supports a bi-directional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is the master and the device that is controlled is the slave. The master will always initiate data transfers and provide the clock for both transmit and receive operations. Therefore, the FM24C256 will be considered a slave in all applications. Write Protect (WP) Clock and Data Conventions The SCL input is used to clock all data into and out of the device. Serial Data (SDA) If tied to V CC, PROGRAM operations onto the entire memory will not be executed. READ operations are possible. If tied to V normal operation is enabled, READ/WRITE over the entire memory is possible. Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Refer Figure 1 . SS, Start Condition This feature allows the user to assign the entire memory as ROM which can be protected against accidental programming. When write is disabled, slave address and word address will be acknowledged but data will not be acknowledged. All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The FM24C256 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. Refer Figure 2 . This pin has an internal pull-down circuit. However, on systems where write protection is not required it is recommended that this pin is tied to V SS. Stop Condition All communications are terminated by a stop condition, which is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used by the FM24C256 to place the device in the standby power mode. Refer Figure 2 . Device Selection Inputs A2, A1 and A0 (as appropriate) These inputs collectively serve as “chip select” signal to an EEPROM when multiple EEPROMs are present on the same IIC bus. Hence these inputs should be connected to V CC or V SS in a unique manner to allow proper selection of an EEPROM amongst multiple EEPROMs. During a typical addressing sequence, every EEPROM on the IIC bus compares the configuration of these inputs to the respective 3 bit “Device/Page block selection” information (part of slave address) to determine a valid selection. For e.g. if the 3 bit “Device/Page block selection” is 1-0-1, then the EEPROM whose “Device Selection inputs” (A2, A1 and A0) are connected to V CC-VSS-VCC respectively, is selected. FM24C256 Array Addressing During Read/Write operations, addressing the EEPROM memory array involves in providing 2 address bytes, “Word Address 1” and “Word Address 0." However on FM24C256 only the 7 least significant bits (LSB) of “Word Address 1” byte are used in decoding the access location. The remaining 1 bit is not used and is recommended to be set to “0." All 8 bits of the “Word Address 0” byte are used in decoding the access location. 8 FM24C256 Rev. D.1 www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Pin Descriptions FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Data Validity (Figure 1) SCL SDA DATA STABLE DATA CHANGE Start and Stop Definition (Figure 2) SCL SDA START CONDITION STOP CONDITION Acknowledge Response from Receiver (Figure 3) SCL FROM MASTER 1 8 9 DATA OUTPUT FROM TRANSMITTER tDH tAA DATA OUTPUT FROM RECEIVER START CONDITION ACKNOWLEDGE PULSE 9 FM24C256 Rev. D.1 www.fairchildsemi.com Page Write is initiated in the same manner as the Byte Write operation; but instead of terminating the cycle after transmitting the first data byte, the master can further transmit up to 63 more bytes. After the receipt of each byte, FM24C256 will respond with an acknowledge pulse, increment the internal address counter to the next address, and is ready to accept the next data. If the master should transmit more than 64 bytes prior to generating the STOP condition, the address counter will “roll over” and previously loaded data will be re-loaded. As with the Byte Write operation, all inputs are disabled until completion of the internal write cycle. Refer Figure 5 for the address, acknowledge, and data transfer sequence. BYTE WRITE For byte write operation, two bytes of address are required after the slave address. These two bytes select 1 out of the 32K locations in the memory. The master provides these two address bytes and for each address byte received, FM24C256 responds with an acknowledge pulse. Master then provides a byte of data to be written into the memory. Upon receipt of this data, FM24C256 responds with an acknowledge pulse. The master then terminates the transfer by generating a stop condition, at which time the FM24C256 begins the internal write cycle to the memory. While the internal write cycle is in progress the FM24C256 inputs are disabled, and the device will not respond to any requests from the master for the duration of t WR. Refer Figure 4 for the address, acknowledge and data transfer sequence. Acknowledge Polling Once the stop condition is issued to indicate the end of the host’s write operation, the FM24C256 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the FM24C256 is still busy with the write operation, no ACK will be returned. If the FM24C256 has completed the write operation, an ACK will be returned and the host can then proceed with the next read or write operation. PAGE WRITE To minimize write cycle time, FM24C256 offers Page Write feature, which allows simultaneous programming of up to 64 contiguous bytes. To facilitate this feature, the memory array is organized in terms of “Pages”. A Page consists of 64 contiguous byte locations starting at every 64-Byte address boundary (for example, starting at array address 0x0000, 0x0040, 0x0080 etc.). Page Write operation is confined to a single page. In other words a Page Write operation will not cross over to locations on the next page but will “roll over” to the beginning of the same page whenever end of page is reached and additional data bytes are a continued to be provided. A Page Write operation can be initiated to begin at any location within a page (starting address of the Page Write operation need not be the starting address of a Page). Write Protection Programming of the entire memory will not take place if the WP pin of the FM24C256 is connected to V CC. The FM24C256 will respond to slave and byte addresses; but if the memory accessed is write protected by the WP pin, the FM24C256 will not generate an acknowledge after the first byte of data has been received. Thus the program cycle will not be started when the stop condition is asserted. Byte Write (Figure 4) S T Bus Activity: A Master R T SLAVE ADDRESS WORD ADDRESS (1) WORD ADDRESS (0) S T O P DATA SDA Line Bus Activity: EEPROM A C K A C K A C K A C K WORD ADDRESS (1) WORD ADDRESS (0) DATA n DATA n+63 Page Write (Figure 5) S T Bus Activity: A Master R T SDA Line Bus Activity SLAVE ADDRESS 1 0 1 0 A C K A C K A C K 10 FM24C256 Rev. D.1 S T O P A C K www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Write Operations will not acknowledge the transfer but does generate the stop condition, and therefore the FM24C256 discontinues transmission. Refer Figure 7 for the address, acknowledge, and data transfer sequence. Read operations are initiated in the same manner as write operations, with the exception that the R/W bit of the slave address is set to a one. There are three basic read operations: current address read, random read, and sequential read. Sequential Read Sequential reads can be initiated as either a current address read or random access read. The first word is transmitted in the same manner as the other read modes; however, the master now responds with an acknowledge, indicating it requires additional data. The FM24C256 continues to output data for each acknowledge received. The read operation is terminated by the master not responding with an acknowledge or by generating a stop condition. Current Address Read Internally the FM24C256 contains an address counter that maintains the address of the last byte accessed, incremented by one. Therefore, if the last access (either a read or write) was to address n, the next read operation would access data from address n + 1. Upon receipt of the slave address with R/W set to "1," the FM24C256 issues an acknowledge and transmits the eight bit word. The master will not acknowledge the transfer but does generate a stop condition, and therefore the FM24C256 discontinues transmission. Refer Figure 6 for the sequence of address, acknowledge and data transfer. The data output is sequential with the data from address n followed by the data from n + 1. The address counter for read operations increments all word address bits, allowing the entire memory contents to be serially read during one operation. After the entire memory has been read, the counter "rolls over" to the beginning of the memory. FM24C256 continues to output data for each acknowledge received. Refer Figure 8 for the address, acknowledge, and data transfer sequence. Random Read Random read operations allow the master to access any memory location in a random manner. Prior to issuing the slave address with the R/W bit set to "1," the master must first perform a “dummy” write operation. The master issues the start condition, slave address with the R/W bit set to "0" and then the byte address. After the byte address acknowledge, the master immediately issues another start condition and the slave address with the R/W bit set to one. This will be followed by an acknowledge from the FM24C256 and then by the eight bit word. The master Current Address Read (Figure 6) S T A R T Bus Activity: Master 1 0 1 0 SDA Line S T O P SLAVE ADDRESS 1 A C K Bus Activity: EEPROM DATA NO A C K Random Read (Figure 7) S T A Bus Activity: R Master T SLAVE ADDRESS WORD ADDRESS (1) S T A R T WORD ADDRESS (0) SLAVE ADDRESS 0 SDA Line DATA 1 A C K Bus Activity: EEPROM S T O P A C K A C K A C K NO A C K Sequential Read (Figure 8) Bus Activity: Master A C K Slave Address A C K S T O P A C K SDA Line Bus Activity: EEPROM A C K DATA n +1 DATA n +1 DATA n + 2 11 FM24C256 Rev. D.1 DATA n + x NO A C K www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Read Operations 0.189 - 0.197 (4.800 - 5.004) 8 7 6 5 0.228 - 0.244 (5.791 - 6.198) 1 2 3 4 Lead #1 IDENT 0.010 - 0.020 x 45¡ (0.254 - 0.508) 0.0075 - 0.0098 (0.190 - 0.249) Typ. All Leads 0.150 - 0.157 (3.810 - 3.988) 0.053 - 0.069 (1.346 - 1.753) 8¡ Max, Typ. All leads 0.004 (0.102) All lead tips 0.004 - 0.010 (0.102 - 0.254) Seating Plane 0.014 (0.356) 0.016 - 0.050 (0.406 - 1.270) Typ. All Leads 0.050 (1.270) Typ 0.014 - 0.020 Typ. (0.356 - 0.508) 8-Pin Molded Small Outline Package (M8) Package Number M08A 12 FM24C256 Rev. D.1 www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Physical Dimensions inches (millimeters) unless otherwise noted 0.373 - 0.400 (9.474 - 10.16) 0.090 (2.286) 8 0.092 DIA (2.337) 7 6 0.250 - 0.005 (6.35 ± 0.127) + Pin #1 IDENT 0.032 ± 0.005 (0.813 ± 0.127) RAD 5 8 Pin #1 IDENT 1 Option 1 1 0.280 MIN (7.112) 0.300 - 0.320 (7.62 - 8.128) 7 2 3 0.040 Typ. (1.016) 0.030 MAX (0.762) 20° ± 1° 4 Option 2 0.145 - 0.200 (3.683 - 5.080) 0.039 (0.991) 0.130 ± 0.005 (3.302 ± 0.127) 95° ± 5° 0.009 - 0.015 (0.229 - 0.381) +0.040 0.325 -0.015 +1.016 8.255 -0.381 0.125 (3.175) DIA NOM 0.125 - 0.140 (3.175 - 3.556) 0.065 (1.651) 90° ± 4° Typ 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) 0.045 ± 0.015 (1.143 ± 0.381) 0.020 (0.508) Min 0.060 (1.524) 0.050 (1.270) Molded Dual-In-Line Package (N) Package Number N08E Life Support Policy Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of Fairchild Semiconductor Corporation. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. Fairchild Semiconductor Americas Customer Response Center Tel. 1-888-522-5372 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Fairchild Semiconductor Europe Fax: +44 (0) 1793-856858 Deutsch Tel: +49 (0) 8141-6102-0 English Tel: +44 (0) 1793-856856 Français Tel: +33 (0) 1-6930-3696 Italiano Tel: +39 (0) 2-249111-1 Fairchild Semiconductor Hong Kong 8/F, Room 808, Empire Centre 68 Mody Road, Tsimshatsui East Kowloon. Hong Kong Tel; +852-2722-8338 Fax: +852-2722-8383 Fairchild Semiconductor Japan Ltd. 4F, Natsume Bldg. 2-18-6, Yushima, Bunkyo-ku Tokyo, 113-0034 Japan Tel: 81-3-3818-8840 Fax: 81-3-3818-8841 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 13 FM24C256 Rev. D.1 www.fairchildsemi.com FM24C256 – 256K-Bit Standard 2-Wire Bus Interface Serial EEPROM Physical Dimensions inches (millimeters) unless otherwise noted