24LC65 64K 2.5V I2C Smart Serial EEPROM PACKAGE TYPES FEATURES A0 1 8 VCC A1 2 7 NC A2 3 6 SCL VSS 4 5 SDA A0 1 8 VCC A1 2 7 NC A2 3 6 SCL VSS 4 5 SDA SOIC 24LC65 DESCRIPTION PDIP 24LC65 • Voltage operating range: 2.5V to 6.0V - Peak write current 3 mA at 6.0V - Maximum read current 150 µA at 6.0V - Standby current 1 µA typical • Industry standard two wire bus protocol I2C compatible • 8 byte page, or byte modes available • 2 ms typical write cycle time, byte or page • 64-byte input cache for fast write loads • Up to 8 devices may be connected to the same bus for up to 512K bits total memory • Including 100 kHz (2.5V) and 400 kHz (5.0V) compatibility • Programmable block security options • Programmable endurance options • Schmitt trigger, filtered inputs for noise suppression • Output slope control to eliminate ground bounce • Self-timed ERASE and WRITE cycles • Power on/off data protection circuitry • Endurance: - 10,000,000 E/W cycles guaranteed for a High Endurance Block - 1,000,000 E/W cycles guaranteed for a Standard Endurance Block • Electrostatic discharge protection > 4000V • Data retention > 200 years • 8-pin PDIP/SOIC packages • Temperature ranges - Commercial (C): 0°C to +70°C - Industrial (I) -40°C to +85°C BLOCK DIAGRAM HV Generator A0..A2 I/O Control Logic Memory Control Logic XDEC EEPROM ARRAY Page Latches Cache I/O The Microchip Technology Inc. 24LC65 is a “smart” 8K x 8 Serial Electrically Erasable PROM. This device has been developed for advanced, low power applications such as personal communications, and provides the systems designer with flexibility through the use of many new user-programmable features. The 24LC65 offers a relocatable 4K bit block of ultra-high-endurance memory for data that changes frequently. The remainder of the array, or 60K bits, is rated at 1,000,000 ERASE/WRITE (E/W) cycles guaranteed. The 24LC65 features an input cache for fast write loads with a capacity of eight pages, or 64 bytes. This device also features programmable security options for E/W protection of critical data and/or code of up to fifteen 4K SCL YDEC SDA Vcc Vss Sense AMP R/W Control blocks. Functional address lines allow the connection of up to eight 24LC65's on the same bus for up to 512K bits contiguous EEPROM memory. Advanced CMOS technology makes this device ideal for low-power nonvolatile code and data applications. The 24LC65 is available in the standard 8-pin plastic DIP and 8-pin surface mount SOIC package. I2C is a trademark of Philips Corporation. Smart Serial is a trademark of Microchip Technology Inc. 1996 Microchip Technology Inc. DS21073E-page 1 This document was created with FrameMaker 4 0 4 24LC65 1.0 ELECTRICAL CHARACTERISTICS 1.1 Maximum Ratings* TABLE 1-1: Name Function A0..A2 Vss SDA SCL VCC NC VCC...................................................................................7.0V All inputs and outputs w.r.t. VSS ............... -0.6V to VCC +1.0V Storage temperature ...................................... -65˚C to+150˚C Ambient temp. with power applied ................ -65˚C to +125˚C Soldering temperature of leads (10 seconds) ............. +300˚C ESD protection on all pins ..................................................≥ 4 kV *Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. TABLE 1-2: PIN FUNCTION TABLE User Configurable Chip Selects Ground Serial Address/Data/I/O Serial Clock +2.5V to 6.0V Power Supply No Internal Connection DC CHARACTERISTICS VCC = +2.5V to +6.0V Commercial (C): Tamb = 0°C to +70°C Industrial (I): Tamb = -40°C to +85°C Parameter Sym A0, A1, A2, SCL and SDA pins: VIH High level input voltage VIL Low level input voltage VHYS Hysteresis of Schmitt Trigger inputs Low level output voltage VOL Input leakage current ILI Output leakage current ILO Pin capacitance CIN, COUT (all inputs/outputs) Operating current ICC WRITE ICC Read Standby current ICCS Min Max Units .7 Vcc — .05 VCC — -10 -10 — — .3 VCC — .40 10 10 10 V V V V µA µA pF — — — 3 150 5 mA µA µA Conditions (Note 1) IOL = 3.0 mA VIN = .1V to VCC VOUT = .1V to VCC VCC = 5.0V (Note 1) Tamb = 25˚C, Fclk = 1 MHz VCC = 6.0V, SCL = 400 kHz VCC = 6.0V, SCL = 400 kHz VCC = 5.0V, SCL = SDA = VCC (Note 1) Note 1: This parameter is periodically sampled and not 100% tested. FIGURE 1-1: BUS TIMING START/STOP VHYS SCL THD:STA TSU:STA TSU:STO SDA START DS21073E-page 2 STOP 1996 Microchip Technology Inc. 24LC65 TABLE 1-3: AC CHARACTERISTICS Vcc = 2.5V-6.0V STD. MODE Symbol Parameter VCC = 4.5-6.0V FAST MODE Min Max Min Max Units Remarks Clock frequency Clock high time Clock low time SDA and SCL rise time SDA and SCL fall time START condition setup time FCLK THIGH TLOW TR TF THD:STA — 4000 4700 — — 4000 100 — — 1000 300 — — 600 1300 — — 600 400 — — 300 300 — kHz ns ns ns ns ns START condition setup time TSU:STA 4700 — 600 — ns Data input hold time Data input setup time STOP condition setup time Output valid from clock Bus free time THD:DAT TSU:DAT TSU:STO TAA TBUF 0 250 4000 — 4700 — — — 3500 — 0 100 600 — 1300 — — — 900 — ns ns ns ns ns TOF — 250 250 ns TSP — 50 20 + 0.1 CB — (Note 2) Time the bus must be free before a new transmission can start (Note 1), CB ≤ 100 pF 50 ns Note 3 TWR — 5 — 5 10M 1M — — 10M 1M — — Output fall time from VIH min to VIL max Input filter spike suppression (SDA and SCL pins) Write cycle time Endurance High Endurance Block Rest of Array (Note 1) (Note 1) After this period the first clock pulse is generated Only relevant for repeated START condition ms/page (Note 4) cycles 25°C, Vcc = 5.0V, Block Mode (Note 5) Note 1: Not 100 percent tested. CB = total capacitance of one bus line in pF. 2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region (minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions. 3: The combined TSP and VHYS specifications are due to new Schmitt trigger inputs which provide improved noise and spike suppression. This eliminates the need for a Ti specification for standard operation. 4: The times shown are for a single page of 8 bytes. Multiply by the number of pages loaded into the write cache for total time. 5: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific application, please consult the Total Endurance Model which can be obtained on our BBS or website. FIGURE 1-2: BUS TIMING DATA TF TR THIGH TLOW SCL TSU:STA THD:DAT TSU:DAT THD:STA SDA IN TSP TSU:STO TBUF TAA TAA SDA OUT 1996 Microchip Technology Inc. DS21073E-page 3 24LC65 2.0 FUNCTIONAL DESCRIPTION The 24LC65 supports a bidirectional two-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus must be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions, while the 24LC65 works as slave. Both master and slave can operate as transmitter or receiver but the master device determines which mode is activated. 3.0 BUS CHARACTERISTICS 3.4 Data Valid (D) The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of the data bytes transferred between the START and STOP conditions is determined by the master device. The following bus protocol has been defined: 3.5 • Data transfer may be initiated only when the bus is not busy. • During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as a START or STOP condition. Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse which is associated with this acknowledge bit. Accordingly, the following bus conditions have been defined (Figure 3-1). 3.1 Bus not Busy (A) Both data and clock lines remain HIGH. 3.2 Start Data Transfer (B) A HIGH to LOW transition of the SDA line while the clock (SCL) is HIGH determines a START condition. All commands must be preceded by a START condition. 3.3 Note: Acknowledge The 24LC65 does not generate any acknowledge bits if an internal programming cycle is in progress. A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of course, setup and hold times must be taken into account. During reads, a master must signal an end of data to the slave by NOT generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave (24LC65) must leave the data line HIGH to enable the master to generate the STOP condition. Stop Data Transfer (C) A LOW to HIGH transition of the SDA line while the clock (SCL) is HIGH determines a STOP condition. All operations must be ended with a STOP condition. FIGURE 3-1: (A) DATA TRANSFER SEQUENCE ON THE SERIAL BUS (B) (D) START CONDITION ADDRESS OR ACKNOWLEDGE VALID (D) (C) (A) SCL SDA DS21073E-page 4 DATA ALLOWED TO CHANGE STOP CONDITION 1996 Microchip Technology Inc. 24LC65 3.6 Device Addressing A control byte is the first byte received following the start condition from the master device. The control byte consists of a four bit control code, for the 24LC65 this is set as 1010 binary for read and write operations. The next three bits of the control byte are the device select bits (A2, A1, A0). They are used by the master device to select which of the eight devices are to be accessed. These bits are in effect the three most significant bits of the word address. The last bit of the control byte defines the operation to be performed. When set to a one a read operation is selected, when set to a zero a write operation is selected. The next two bytes received define the address of the first data byte (Figure 4-1). Because only A12..A0 are used, the upper three address bits must be zeros. The most significant bit of the most significant byte is transferred first. Following the start condition, the 24LC65 monitors the SDA bus checking the device type identifier being transmitted. Upon receiving a 1010 code and appropriate device select bits, the slave device (24LC65) outputs an acknowledge signal on the SDA line. Depending upon the state of the R/W bit, the 24LC65 will select a read or write operation. Operation Control Code Device Select R/W Read 1010 Device Address 1 Write 1010 Device Address 0 FIGURE 3-2: 1 0 FIGURE 4-1: 1 0 A2 R/W A1 4.1 Byte Write 4.2 Page Write The write control byte, word address and the first data byte are transmitted to the 24LC65 in the same way as in a byte write. But instead of generating a stop condition the master transmits up to eight pages of eight data bytes each (64 bytes total) which are temporarily stored in the on-chip page cache of the 24LC65. They will be written from the cache into the EEPROM array after the master has transmitted a stop condition. After the receipt of each word, the six lower order address pointer bits are internally incremented by one. The higher order seven bits of the word address remain constant. If the master should transmit more than eight bytes prior to generating the stop condition (writing across a page boundary), the address counter (lower three bits) will roll over and the pointer will be incremented to point to the next line in the cache. This can continue to occur up to eight times or until the cache is full, at which time a stop condition should be generated by the master. If a stop condition is not received, the cache pointer will roll over to the first line (byte 0) of the cache, and any further data received will overwrite previously captured data. The stop condition can be sent at any time during the transfer. As with the byte write operation, once the stop condition is received an internal write cycle will begin. The 64 byte cache will continue to capture data until a stop condition occurs or the operation is aborted (Figure 4-2). READ/WRITE SLAVE ADDRESS WRITE OPERATION Following the start condition from the master, the control code (four bits), the device select (three bits), and the R/W bit which is a logic low is placed onto the bus by the master transmitter. This indicates to the addressed slave receiver (24LC65) that a byte with a word address will follow after it has generated an acknowledge bit during the ninth clock cycle. Therefore the next byte transmitted by the master is the high-order byte of the word address and will be written into the address pointer of the 24LC65. The next byte is the least significant address byte. After receiving another acknowledge signal from the 24LC65 the master device will transmit the data word to be written into the addressed memory location. The 24LC65 acknowledges again and the master generates a stop condition. This initiates the internal write cycle, and during this time the 24LC65 will not generate acknowledge signals (Figure 4-1). CONTROL BYTE ALLOCATION START 4.0 A A0 BYTE WRITE BUS ACTIVITY MASTER S T A R T SDA LINE S CONTROL BYTE BUS ACTIVITY 1996 Microchip Technology Inc. WORD ADDRESS S T O P DATA P 0 0 0 A C K A C K A C K DS21073E-page 5 24LC65 FIGURE 4-2: PAGE WRITE (FOR CACHE WRITE, SEE FIGURE 8-2) S T A R T BUS ACTIVITY MASTER WORD ADDRESS (1) CONTROL BYTE SDA LINE WORD ADDRESS (0) S T O P DATA n + 7 DATA n 0 0 0 A C K A C K BUS ACTIVITY: FIGURE 4-3: A C K A C K A C K CURRENT ADDRESS READ BUS ACTIVITY MASTER S T A R T SDA LINE S CONTROL BYTE S T O P DATA n P A C K BUS ACTIVITY N O A C K FIGURE 4-4: S T A R T RANDOM READ WORD ADDRESS (1) CONTROL BYTE FIGURE 4-5: BUS ACTIVITY MASTER WORD ADDRESS (0) CONTROL BYTE S T O P DATA n 0 0 0 SDA LINE BUS ACTIVITY S T A R T A C K A C K A C K N O A C K A C K SEQUENTIAL READ CONTROL BYTE DATA n DATA n + 1 DATA n + 2 S T O P DATA n + X P SDA LINE BUS ACTIVITY A C K A C K A C K A C K N O A C K DS21073E-page 6 1996 Microchip Technology Inc. 24LC65 5.0 READ OPERATION Read operations are initiated in the same way as write operations with the exception that the R/W bit of the slave address is set to one. There are three basic types of read operations: current address read, random read, and sequential read. 5.1 Current Address Read The 24LC65 contains an address counter that maintains the address of the last word accessed, internally incremented by one. Therefore, if the previous access (either a read or write operation) was to address n (n is any legal address), the next current address read operation would access data from address n + 1. Upon receipt of the slave address with R/W bit set to one, the 24LC65 issues an acknowledge and transmits the eight bit data word. The master will not acknowledge the transfer but does generate a stop condition and the 24LC65 discontinues transmission (Figure 4-3). 5.2 Random Read Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, first the word address must be set. This is done by sending the word address to the 24LC65 as part of a write operation (R/W bit set to 0). After the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. Then the master issues the control byte again but with the R/W bit set to a one. The 24LC65 will then issue an acknowledge and transmit the eight bit data word. The master will not acknowledge the transfer but does generate a stop condition which causes the 24LC65 to discontinue transmission (Figure 4-4). 5.3 5.4 Contiguous Addressing Across Multiple Devices The device select bits A2, A1, A0 can be used to expand the contiguous address space for up to 512K bits by adding up to eight 24LC65's on the same bus. In this case, software can use A0 of the control byte as address bit A13, A1 as address bit A14, and A2 as address bit A15. 5.5 Noise Protection The SCL and SDA inputs have filter circuits which suppress noise spikes to assure proper device operation even on a noisy bus. All I/O lines incorporate Schmitt triggers for 400 KHz (Fast Mode) compatibility. 5.6 High Endurance Block The location of the high-endurance block within the memory map is programmed by setting the leading bit 7 (S/HE) of the configuration byte to 0. The upper bits of the address loaded in this command will determine which 4K block within the memory map will be set to high endurance. This block will be capable of 10,000,000 ERASE/WRITE cycles typical (Figure 8-1). Note: The High Endurance Block cannot be changed after the security option has been set. If the H.E. block is not programmed by the user, the default location is the highest block of memory. Sequential Read Sequential reads are initiated in the same way as a random read except that after the 24LC65 transmits the first data byte, the master issues an acknowledge as opposed to the stop condition used in a random read. This acknowledge directs the 24LC65 to transmit the next sequentially addressed 8 bit word (Figure 4-5). Following the final byte transmitted to the master, the master will NOT generate an acknowledge but will generate a stop condition. To provide sequential reads the 24LC65 contains an internal address pointer which is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation. 1996 Microchip Technology Inc. DS21073E-page 7 24LC65 5.7 Security Options The 24LC65 has a sophisticated mechanism for write-protecting portions of the array. This write protect function is programmable and allows the user to protect 0-15 contiguous 4K blocks. The user sets the security option by sending to the device the starting block number for the protected region and the number of blocks to be protected. If the security option is invoked with 0 blocks protected, then all portions of the array will be unprotected. All parts will come from the factory in the default configuration with the starting block number set to 15 and the number of protected blocks set to zero. THE SECURITY OPTION CAN BE SET ONLY ONCE. To invoke the security option, a write command is sent to the device with the leading bit (bit 7) of the first address byte set to a 1 (Figure 8-1). Bits 1-4 of the first address byte define the starting block number for the protected region. For example, if the starting block number is to be set to 5, the first address byte would be 1XX0101X. Bits 0, 5 and 6 of the first address byte are disregarded by the device and can be either high or low. The device will acknowledge after the first address byte. A byte of don’t care bits is then sent by the master, with the device acknowledging afterwards. The third byte sent to the device has bit 7 (S/HE) set high and bit 6 (R) set low. Bits 4 and 5 are don’t cares and bits 0-3 define the number of blocks to be write protected. For example, if three blocks are to be protected, the third byte would be 10XX0011. After the third byte is sent to the device, it will acknowledge and a STOP bit is then sent by the master to complete the command. During a normal write sequence, if an attempt is made to write to a protected address, no data will be written and the device will not report an error or abort the command. If a write command is attempted across a secure boundary, unprotected addresses will be written and protected addresses will not. 5.8 Security Configuration Read The status of the secure portion of memory can be read by using the same technique as programming this option except the READ bit (bit 6) of the configuration byte is set to a one. After the configuration byte is sent, the device will acknowledge and then send two bytes of data to the master just as in a normal read sequence. The master must acknowledge the first byte and not acknowledge the second, and then send a stop bit to end the sequence. The upper four bits of both of these bytes will always be read as '1's. The lower four bits of the first byte contains the starting secure block. The lower four bits of the second byte contains the number of secure blocks. The default starting secure block is fifteen and the default number of secure blocks is zero (Figure 8-1). DS21073E-page 8 6.0 ACKNOWLEDGE POLLING Since the device will not acknowledge during a write cycle, this can be used to determine when the cycle is complete (this feature can be used to maximize bus throughput). Once the stop condition for a write command has been issued from the master, the device initiates the internally timed write cycle. ACK polling can be initiated immediately. This involves the master sending a start condition followed by the control byte for a write command (R/W = 0). If the device is still busy with the write cycle, then no ACK will be returned. If the cycle is complete, then the device will return the ACK and the master can then proceed with the next read or write command. See Figure 6-1 for flow diagram. FIGURE 6-1: ACKNOWLEDGE POLLING FLOW Send Write Command Send Stop Condition to Initiate Write Cycle Send Start Send Control Byte with R/W = 0 Did Device Acknowledge (ACK = 0)? NO YES Next Operation 1996 Microchip Technology Inc. 24LC65 7.0 PAGE CACHE AND ARRAY MAPPING The cache is a 64 byte (8 pages x 8 bytes) FIFO buffer. The cache allows the loading of up to 64 bytes of data before the write cycle is actually begun, effectively providing a 64-byte burst write at the maximum bus rate. Whenever a write command is initiated, the cache starts loading and will continue to load until a stop bit is received to start the internal write cycle. The total length of the write cycle will depend on how many pages are loaded into the cache before the stop bit is given. Maximum cycle time for each page is 5 ms. Even if a page is only partially loaded, it will still require the same cycle time as a full page. If more than 64 bytes of data are loaded before the stop bit is given, the address pointer will 'wrap around' to the beginning of cache page 0 and existing bytes in the cache will be overwritten. The device will not respond to any commands while the write cycle is in progress. 7.1 Cache Write Starting at a Page Boundary If a write command begins at a page boundary (address bits A2, A1 and A0 are zero), then all data loaded into the cache will be written to the array in sequential addresses. This includes writing across a 4K block boundary. In the example shown below, (Figure 8-2) a write command is initiated starting at byte 0 of page 3 with a fully loaded cache (64 bytes). The first byte in the cache is written to byte 0 of page 3 (of the array), with the remaining pages in the cache written to sequential pages in the array. A write cycle is executed after each page is written. Since the write begins at page 3 and 8 pages are loaded into the cache, the last 3 pages of the cache are written to the next row in the array. 7.2 Cache Write Starting at a Non-Page Boundary When a write command is initiated that does not begin at a page boundary (i.e., address bits A2, A1 and A0 are not all zero), it is important to note how the data is loaded into the cache, and how the data in the cache is written to the array. When a write command begins, the first byte loaded into the cache is always loaded into page 0. The byte within page 0 of the cache where the load begins is determined by the three least significant address bits (A2, A1, A0) that were sent as part of the write command. If the write command does not start at byte 0 of a page and the cache is fully loaded, then the last byte(s) loaded into the cache will roll around to page 0 of the cache and fill the remaining empty bytes. If more than 64 bytes of data are loaded into the cache, data already loaded will be overwritten. In the example shown in Figure 8-3, a write command has been initiated starting at byte 2 of page 3 in the array with a fully loaded cache of 64 bytes. Since the cache started loading at byte 2, the last two bytes loaded into the cache 1996 Microchip Technology Inc. will 'roll over' and be loaded into the first two bytes of page 0 (of the cache). When the stop bit is sent, page 0 of the cache is written to page 3 of the array. The remaining pages in the cache are then loaded sequentially to the array. A write cycle is executed after each page is written. If a partially loaded page in the cache remains when the STOP bit is sent, only the bytes that have been loaded will be written to the array. 7.3 Power Management The design incorporates a power standby mode when not in use and automatically powers off after the normal termination of any operation when a stop bit is received and all internal functions are complete. This includes any error conditions, i.e. not receiving an acknowledge or stop condition per the two-wire bus specification. The device also incorporates VDD monitor circuitry to prevent inadvertent writes (data corruption) during low-voltage conditions. The VDD monitor circuitry is powered off when the device is in standby mode in order to further reduce power consumption. 8.0 PIN DESCRIPTIONS 8.1 A0, A1, A2 Chip Address Inputs The A0..A2 inputs are used by the 24LC65 for multiple device operation and conform to the two-wire bus standard. The levels applied to these pins define the address block occupied by the device in the address map. A particular device is selected by transmitting the corresponding bits (A2, A1, A0) in the control byte (Figure 3-2 and Figure 8-1). 8.2 SDA Serial Address/Data Input/Output This is a bidirectional pin used to transfer addresses and data into and data out of the device. It is an open drain terminal, therefore the SDA bus requires a pullup resistor to VCC (typical 10KΩ for 100 kHz, 1KΩ for 400 kHz). For normal data transfer SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the START and STOP conditions. 8.3 SCL Serial Clock This input is used to synchronize the data transfer from and to the device. DS21073E-page 9 24LC65 FIGURE 8-1: CONTROL SEQUENCE BIT ASSIGNMENTS Control Byte 1 0 1 0 A A A R/W 2 1 0 Address Byte 1 Address Byte 0 S 0 0 A A A A A 12 11 10 9 8 A A 7 • • • • • • 0 Configuration Byte R X X B B B B 3 2 1 0 S/HE Slave Device Address Select Bits Block Count Security Read S t a r t Acknowledge from Master Acknowledges from Device Data from Device R No ACK S t Data from Device o p A A A A A 1 0 1 0 A A A 0 C 1 X X X X X X X C X X X X X X X X C 1 1 X X X X X X C 1 1 1 1 B B B B C 1 1 1 1 N N N N 2 1 0 3 2 1 0 3 2 1 0 K K K K K S/HE Starting Block Number Number of Blocks to Protect Security Write S t a r t S t o p Acknowledges from Device R A A A A 1 0 1 0 A A A 0 C 1 X X B B B B X C X X X X X X X X C 1 0 X X N N N N C 3 2 1 0 K 2 1 0 3 2 1 0 K K K S/HE Starting Block Number Number of Blocks to Protect High Endurance Block Read S t a r t No ACK Acknowledges from Device Data from Device R S t o p A A A A 1 0 1 0 A A A 0 C 1 X X X X X X X C X X X X X X X X C 0 1 X X X X X X C 1 1 1 1 B B B B 2 1 0 3 2 1 0 K K K K S/HE High Endurance Block Number High Endurance Block Write S t a r t Acknowledges from Device R S t o p A A A A 1 0 1 0 A A A 0 C 1 X X B B B B X C X X X X X X X X C 0 0 X X 0 0 0 0 C 2 1 0 3 2 1 0 K K K K High Endurance Block Number DS21073E-page 10 S/HE 1996 Microchip Technology Inc. 24LC65 FIGURE 8-2: CACHE WRITE TO THE ARRAY STARTING AT A PAGE BOUNDARY 1 Write command initiated at byte 0 of page 3 in the array; First data byte is loaded into the cache byte 0. 2 64 bytes of data are loaded into cache. cache page 0 cache byte 0 cache byte 1 cache byte 7 • • • cache page 1 cache page 2 bytes 8-15 bytes 16-23 3 Write from cache into array initiated by STOP bit. Page 0 of cache written to page 3 of array. Write cycle is executed after every page is written. page 0 page 1 page 2 byte 0 byte 1 page 0 page 1 page 2 • • • cache page 7 bytes 56-63 4 Remaining pages in cache are written to sequential pages in array. • • • byte 7 page 3 page 4 • • • page 7 array row n page 4 • • • page 7 array row n + 1 5 Last page in cache written to page 2 in next row. FIGURE 8-3: Last 2 bytes loaded into page 0 of cache. CACHE WRITE TO THE ARRAY STARTING AT A NON-PAGE BOUNDARY 1 Write command initiated; 64 bytes of data loaded into cache starting at byte 2 of page 0. 3 cache byte 0 cache byte 1 cache byte 2 • • • cache byte 7 2 Last 2 bytes loaded 'roll over' to beginning. cache page 1 cache page 2 bytes 8-15 bytes 16-23 • • • cache page 7 bytes 56-63 4 Write from cache into array initiated by STOP bit. 5 Remaining bytes in cache are Page 0 of cache written to page 3 of array. Write cycle is executed after every page is written. written sequentially to array. page 0 page 1 page 2 byte 0 byte 1 byte 2 page 0 page 1 page 2 byte 3 page 3 byte 4 • • • byte 7 page 4 • • • page 4 • • • page 7 array row n page 7 array row n+1 6 Last 3 pages in cache written to next row in array. 1996 Microchip Technology Inc. DS21073E-page 11 24LC65 24LC65 Product Identification System To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed sales offices. 24LC65 – /P Package: P = Plastic DIP (300 mil Body) SM = Plastic SOIC (207 mil Body, EIAJ standard) Temperature Range: Device: Blank = 0˚C to +70˚C I = -40˚C to +85˚C 24LC65 24LC65T 64K I2C Serial EEPROM (100 kHz/400kHz) 64K I2C Serial EEPROM (Tape and Reel) AMERICAS AMERICAS (CONT) EUROPE Corporate Office Microchip Technology Inc. 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 602 786-7200 Fax: 602 786-7277 Technical Support: 602 786-7627 Web: http://www.microchip.com Atlanta Microchip Technology Inc. 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770 640-0034 Fax: 770 640-0307 Boston Microchip Technology Inc. 5 Mount Royal Avenue Marlborough, MA 01752 Tel: 508 480-9990 Fax: 508 480-8575 Chicago Microchip Technology Inc. 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 708 285-0071 Fax: 708 285-0075 Dallas Microchip Technology Inc. 14651 Dallas Parkway, Suite 816 Dallas, TX 75240-8809 Tel: 972 991-7177 Fax: 972 991-8588 Dayton Microchip Technology Inc. Suite 150 Two Prestige Place Miamisburg, OH 45342 Tel: 513 291-1654 Fax: 513 291-9175 Los Angeles Microchip Technology Inc. 18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 714 263-1888 Fax: 714 263-1338 New York Microchip Technmgy Inc. 150 Motor Parkway, Suite 416 Hauppauge, NY 11788 Tel: 516 273-5305 Fax: 516 273-5335 San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408 436-7950 Fax: 408 436-7955 Toronto Microchip Technology Inc. 5925 Airport Road, Suite 200 Mississauga, Ontario L4V 1W1, Canada Tel: 905 405-6279 Fax: 905 405-6253 United Kingdom Arizona Microchip Technology Ltd. Unit 6, The Courtyard Meadow Bank, Furlong Road Bourne End, Buckinghamshire SL8 5AJ Tel: 44 1628 850303 Fax: 44 1628 850178 France Arizona Microchip Technology SARL Zone Industrielle de la Bonde 2 Rue du Buisson aux Fraises 91300 Massy - France Tel: 33 1 69 53 63 20 Fax: 33 1 69 30 90 79 Germany Arizona Microchip Technology GmbH Gustav-Heinemann-Ring 125 D-81739 Muenchen, Germany Tel: 49 89 627 144 0 Fax: 49 89 627 144 44 Italy Arizona Microchip Technology SRL Centro Direzionale Colleone Pas Taurus 1 Viale Colleoni 1 20041 Agrate Brianza Milan Italy Tel: 39 39 6899939 Fax: 39 39 689 9883 Printed on recycled paper. ASIA/PACIFIC China Microchip Technology Unit 406 of Shanghai Golden Bridge Bldg. 2077 Yan’an Road West, Hongiao District Shanghai, Peoples Republic of China Tel: 86 21 6275 5700 Fax: 011 86 21 6275 5060 Hong Kong Microchip Technology RM 3801B, Tower Two Metroplaza 223 Hing Fong Road Kwai Fong, N.T. Hong Kong Tel: 852 2 401 1200 Fax: 852 2 401 3431 India Microchip Technology No. 6, Legacy, Convent Road Bangalore 560 025 India Tel: 91 80 526 3148 Fax: 91 80 559 9840 Korea Microchip Technology 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku, Seoul, Korea Tel: 82 2 554 7200 Fax: 82 2 558 5934 Singapore Microchip Technology 200 Middle Road #10-03 Prime Centre Singapore 188980 Tel: 65 334 8870 Fax: 65 334 8850 Taiwan, R.O.C Microchip Technology 10F-1C 207 Tung Hua North Road Taipei, Taiwan, ROC Tel: 886 2 717 7175 Fax: 886 2 545 0139 JAPAN Microchip Technology Intl. Inc. Benex S-1 6F 3-18-20, Shin Yokohama Kohoku-Ku, Yokohama Kanagawa 222 Japan Tel: 81 45 471 6166 Fax: 81 45 471 6122 9/3/96 All rights reserved. 1996, Microchip Technology Incorporated Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. All rights reserved. All other trademarks mentioned herein are the property of their respective companies. DS21073E-page 12 1996 Microchip Technology Inc.