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1 features ? single 2.5v - 3.6v or 2.7v - 3.6v supply serial peripheral interface (spi) compatible 20 mhz max clock frequency page program operation ? single cycle reprogram (erase and program) ? 4096 pages (264 bytes/page) main memory supports page and block erase operations two 264-byte sram data buffers ? allows receiving of data while reprogramming of nonvolatile memory continuous read capabili ty through entire array ? ideal for code shadowing applications low power dissipation ? 4 ma active read current typical ? 2 a cmos standby current typical hardware data protection feature 100% compatible to at45db081 and at45db081a 5.0v-tolerant inputs: si, sck, cs , reset and wp pins commercial and industri al temperature ranges green (pb/halide-free) packaging options description the at45db081b is a 2.5-volt or 2.7-volt onl y, serial interface flash memory ideally suited for a wide variety of digital voice-, image-, program code- and data-storage applications. its 8,650,752 bits of memory are organized as 4096 pages of 264 bytes each. in addition to the main memory, the at45db081b also contains two sram data buffers of 264 bytes each. the buffers allow receiving of data while a page in the main memory is being reprogrammed, as well as writing a continuous data stream. 8-megabit 2.5-volt only or 2.7-volt only dataflash ? at45db081b tsop top view ty p e 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 rdy/busy reset wp nc nc vcc gnd nc nc nc cs sck si so nc nc nc nc nc nc nc nc nc nc nc nc nc nc cbga top view through package a b c d e 12 3 nc vcc wp reset nc nc gnd rdy/bsy si nc sck cs so nc soic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 gnd nc nc cs sck si so nc nc nc nc nc nc nc vcc nc nc wp reset rdy/busy nc nc nc nc nc nc nc nc pin configurations pin name function cs chip select sck serial clock si serial input so serial output wp hardware page write protect pin reset chip reset rdy/busy ready/busy rev. 2225i?dflsh?9/05 cason top view through package si sck reset cs so gnd vcc wp 8 7 6 5 1 2 3 4
2 at45db081b 2225i?dflsh?9/05 eeprom emulation (bit or byte alterability) is easily handl ed with a self-contained three step read-modify-write operation. unlike conventional flash memories that are accessed randomly with multiple address li nes and a parallel interface, the dataflash uses a spi serial interface to sequentially access its data. dataflash supports spi mode 0 and mode 3. the simple seri al interface facilit ates hardware layout, increases system reliability, minimizes switching noise, and reduces package size and active pin count. the device is optimized for use in many commercial and industrial applications where high density, low pin count, low voltage, and low power are essential. the device oper- ates at clock frequencies up to 20 mhz with a typical active read current consumption of 4 ma. to allow for simple in-sys tem reprogrammabilit y, the at45db081b does not require high input voltages for programming. the device operates from a single power supply, 2.5v to 3.6v or 2.7v to 3.6v, for both the program and read operations. the at45db081b is enabled through the chip select pin (cs ) and accessed via a three-wire interface consisting of the serial input (si), serial output (so), and the serial clock (sck). all programming cycles are self-timed, and no separate erase cycle is required before programming. when the device is shipped from atmel, the most significant page of the memory array may not be erased. in other words, the contents of the last page may not be filled with ffh. block diagram memory array to provide optimal flexibility, the memory array of the at45db 081b is divided into three levels of granularity comprising of sectors, blocks, and pages. the memory architecture diagram illustrates the breakd own of each level and deta ils the number of pages per sector and block. all program operations to the dataflash occur on a page-by-page basis; however, the optional erase operati ons can be performed at the block or page level. flash memory array page (264 bytes) buffer 2 (264 bytes) buffer 1 (264 bytes) i/o interface sck cs reset vcc gnd rdy/busy wp so si
3 at45db081b 2225i?dflsh?9/05 memory architecture diagram device operation the device operation is controlled by instructions from the host processor. the list of instructions and their associated opcodes are contained in tables 1 through 4. a valid instruction starts with the falling edge of cs followed by the appropriate 8-bit opcode and the desired buffer or main memory address location. while the cs pin is low, tog- gling the sck pin controls the loading of the opcode and the desired buffer or main memory address location through the si (serial input) pin. all instructions, addresses and data are transferred with the most significant bit (msb) first. buffer addressing is referenced in the da tasheet using the terminology bfa8 - bfa0 to denote the nine address bits required to designate a byte address within a buffer. main memory addressing is referenced using the terminology pa11 - pa0 and ba8 - ba0 where pa11 - pa0 denotes the 12 address bits required to designate a page address and ba8 - ba0 denotes the nine address bits required to designate a byte address within the page. read commands by specifying the appropriate opcode, data can be read from the main memory or from either one of the two data buffers. the dataflash supports two categories of read modes in relation to the sck signal. the differences between the modes are in respect to the inactive state of the sck signal as well as which clock cycle data will begin to be output. the two categories, which are comprised of four modes total, are defined as inactive clock polarity low or inactive clock polarity high and spi mode 0 or spi mode 3. a separate opcode (refer to table 1 on page 10 for a complete list) is used to select which category will be used for reading . please refer to the ?detailed bit-level read timing? diagrams in th is datasheet for details on th e clock cycle sequences for each mode. continuous array read: by supplying an initial starting address for the main memory array, the continuous array read command can be utilized to sequentially read a continuous stream of data from the device by simply providing a clock signal; no additional addressing information or control signals need to be provided. the dataflash incorporates an in ternal address counter that will auto matically increment on every clock sector 0 = 8 pages 2112 bytes (2k + 64) sector 1 = 248 pages 65,472 bytes (62k + 1984) block = 2112 bytes (2k + 64) 8 pages sector 0 sector 1 page = 264 bytes (256 + 8) page 0 page 1 page 6 page 7 page 8 page 9 page 4094 page 4095 block 0 page 14 page 15 page 16 page 17 page 18 page 4093 block 1 sector architecture block architecture page architecture block 0 block 1 block 30 block 31 block 32 block 33 block 510 block 511 block 62 block 63 block 64 block 65 sector 2 sector 8 = 512 pages 135,168 bytes (128k + 4k) block 2 sector 2 = 256 pages 67,584 bytes (64k + 2k) sector 3 = 512 pages 135,168 bytes (128k + 4k) sector 4 = 512 pages 135,168 bytes (128k + 4k) sector 9 = 512 pages 135,168 bytes (128k + 4k)
4 at45db081b 2225i?dflsh?9/05 cycle, allowing one continuous read operatio n without the need of additional address sequences. to perform a continuous read, an opcode of 68h or e8h must be clocked into the device followed by 24 address bits and 32 don?t care bits. the first three bits of the 24-bit address sequence are reserved for upward and downward compatibility to larger and smaller density devices (see notes under ?command sequence for read/write operations? diagram). the next 12 address bits (pa11 - pa0) specify which page of the main memory array to read, and the last nine bits (ba8 - ba0) of the 24-bit address sequence specify the starting byte address within the page. the 32 don?t care bits that follow the 24 address bits are needed to initialize the read operation. following the 32 don?t care bits, addi tional clock pulses on the sck pin will result in serial data being output on the so (serial output) pin. the cs pin must remain low during the loading of the opcode, the address bits, the don?t care bits, and the reading of data. when the end of a page in main memory is reached during a continuous array re ad, the device will continue re ading at the beginning of the next page with no delays incurred during t he page boundary crossover (the crossover from the end of one page to the beginning of the next page). when the last bit in the main memory array has been read, the device will continue reading back at the begin- ning of the first page of memory. as wit h crossing over page boundaries, no delays will be incurred when wrapping around from the end of the array to the beginning of the array. a low-to-high transition on the cs pin will terminate the read operation and tri-state the so pin. the maximum sck frequency allowable for the continuous array read is defined by the f car specification. the continuous array read bypasses both data buff- ers and leaves the contents of the buffers unchanged. main memory page read: a main memory page read allows the user to read data directly from any one of the 4096 pages in the main memory, bypassing both of the data buffers and leaving the contents of the buffers unchanged. to start a page read, an opcode of 52h or d2h must be clocked into the device followed by 24 address bits and 32 don?t care bits. the first three bits of the 24-bit address sequence are reserved bits, the next 12 address bits (pa11 - pa0) specify the page address, and the next nine address bits (ba8 - ba0) specify the starting byte address within the page. the 32 don?t care bits which follow the 24 address bits are sent to initialize the read operation. fol- lowing the 32 don?t care bits, additional pulses on sck result in serial data being output on the so (serial output) pin. the cs pin must remain low during the loading of the opcode, the address bits, the don?t care bits, and the reading of data. when the end of a page in main memory is re ached during a main memory page read, the device will con- tinue reading at the beginning of the same page. a low-to-high transition on the cs pin will terminate the read operation and tri- state the so pin. buffer read: data can be read from either one of the two buffers, using different opcodes to specify which buffer to read from. an opcode of 54h or d4h is used to read data from buffer 1, and an opcode of 56h or d6h is used to read data from buffer 2. to perform a buffer read, the eight bits of t he opcode must be followed by 15 don?t care bits, nine address bits, and eight don?t care bi ts. since the buffer size is 264 bytes, nine address bits (bfa8 - bfa0) are required to s pecify the first byte of data to be read from the buffer. the cs pin must remain low during the loading of the opcode, the address bits, the don?t care bits, and the reading of data. when the end of a buffer is reached, the device will continue reading back at the beginning of the buffer. a low-to-high transi- tion on the cs pin will terminate th e read operation and tri-state the so pin. status register read: the status register can be used to determine the device?s ready/busy status, the result of a main memory page to buffer compare operation, or the device density. to read the status register, an opcode of 57h or d7h must be
5 at45db081b 2225i?dflsh?9/05 loaded into the device. after the last bit of the opcode is shifted in, the eight bits of the status register, starting with the msb (bit 7), will be shifted out on the so pin during the next eight clock cycles. the five most significant bits of t he status register will contain device information, while the remaining three least-significant bits are reserved for future use and will have undefined values. after bit 0 of the status register has been shifted out, the sequence will repeat itself (as long as cs remains low and sck is being tog- gled) starting again with bit 7. the data in the status register is constantly updated, so each repeating sequence will output new data. ready/busy status is indicated using bit 7 of the status register. if bit 7 is a 1, then the device is not busy and is ready to accept the next command. if bit 7 is a 0, then the device is in a busy state. the user can cont inuously poll bit 7 of the status register by stopping sck at a low level once bit 7 has been output. the status of bit 7 will continue to be output on the so pin, and once the device is no longer busy, the state of so will change from 0 to 1. there are eight operations which can cause the device to be in a busy state: main memory page to buffer transfer, main memory page to buffer com- pare, buffer to main memory page program with built-in erase, buffer to main memory page program without built-in erase, page erase, block erase, main memory page program, and auto page rewrite. the result of the most recent main memory page to buffer compare operation is indi- cated using bit 6 of the status register. if bit 6 is a 0, then the data in the main memory page matches the data in the buffer. if bit 6 is a 1, then at least one bit of the data in the main memory page does not match the data in the buffer. the device density is indicated using bits 5, 4, 3 and 2 of the status register. for the at45db081b, the four bits are 1, 0, 0 and 1. the decimal value of these four binary bits does not equate to the device density; the three bits represent a combinational code relating to differing densities of serial dataflash devices, allowing a total of sixteen dif- ferent density configurations. program and erase commands buffer write: data can be shifted in from the si pin into either buffer 1 or buffer 2. to load data into either buffer, an 8-bit opcode, 84h for buffer 1 or 87h for buffer 2, must be followed by 15 don?t care bits and nine address bits (bfa8 - bfa0). the nine address bits specify the first byte in the buffer to be written. the data is entered following the address bits. if the end of the data buffer is reac hed, the device will wrap around back to the beginning of the buffer. data will co ntinue to be loaded in to the buffer until a low-to-high transition is detected on the cs pin. buffer to main memory page program with built-in erase: data written into either buffer 1 or buffer 2 can be programmed into the main memory. to start the operation, an 8-bit opcode, 83h for buffer 1 or 86h for buffer 2, must be followed by the three reserved bits, 12 address bits (pa11 - pa0) that specify the page in the main memory to be written, and nine additional don ?t care bits. when a low-to-high transition occurs on the cs pin, the part will first erase the selected page in main memory to all 1s and then program the data stored in the buffer into the specified page in the main mem- ory. both the erase and the programming of the page are internally self-timed and should take place in a maximum time of t ep . during this time, the status register will indi- cate that the part is busy. status register format bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 rdy/busy comp1001xx
6 at45db081b 2225i?dflsh?9/05 buffer to main memory page program without built-in erase: a previously erased page within main memory can be programmed with the contents of either buffer 1 or buffer 2. to start the operation, an 8-bit opcode, 88h for buffer 1 or 89h for buffer 2, must be followed by the three reserved bits, 12 address bits (pa11 - pa0) that specify the page in the main memory to be written, and nine addi- tional don?t care bits. when a low-to -high transition occurs on the cs pin, the part will program the data stored in the buffer into the specified page in the main memory. it is necessary that the page in main memory that is being programmed has been previously erased. the programming of the page is internally self-timed and should take place in a maximum time of t p . during this time, the status regi ster will indicate that the part is busy. successive page programming operations without doing a page erase are not recom- mended. in other words, changing bytes within a page from a ?1? to a ?0? during multiple page programming operations without erasing that page is not recommended. page erase: the optional page erase command can be used to individually erase any page in the main memory array allowing the buffer to main memory page program without built-in erase command to be utilized at a later time . to perform a page erase, an opcode of 81h must be loaded into the device, followed by three reserved bits, 12 address bits (pa11 - pa0), and nine don?t care bits. the 12 address bits are used to specify which page of the memory array is to be erased. when a low-to-high transition occurs on the cs pin, the part will erase the selected page to 1s. the erase operation is internally self-timed and should take place in a maximum time of t pe . during this time, the status register will indica te that the part is busy. block erase: a block of eight pages can be erased at one time allowing the buffer to main memory page program without built -in erase command to be utilized to reduce programming times when writing large amounts of data to the device. to perform a block erase, an opcode of 50h must be loaded into the device, followed by three reserved bits, nine address bits (pa11 - pa3), and 12 don?t care bits. the nine address bits are used to specify which block of eigh t pages is to be erased. when a low-to-high transition occurs on the cs pin, the part will erase the selected block of eight pages to 1s. the erase operation is internally self-timed and should take place in a maximum time of t be . during this time, the status regist er will indicate that the part is busy. block erase addressing pa11 pa10 pa9 pa8 pa7 pa6 pa5 pa4 pa3 pa2 pa1 pa0 block 0 0 0000000xxx 0 0 0 0000001xxx 1 0 0 0000010xxx 2 0 0 0000011xxx 3 1 1 1111100xxx508 1 1 1111101xxx509 1 1 1111110xxx510 1 1 1111111xxx511
7 at45db081b 2225i?dflsh?9/05 main memory page program through buffer: this operation is a combina- tion of the buffer write and buffer to main memory page program with built-in erase operations. data is first shifted into buffer 1 or buffer 2 from the si pin and then pro- grammed into a specified page in the main memory. to initiate the operation, an 8-bit opcode, 82h for buffer 1 or 85h for buffer 2, must be followed by the three reserved bits and 21 address bits. the 12 most significant address bits (pa11 - pa0) select the page in the main memory where data is to be written, and the next nine address bits (bfa8 - bfa0) select the first byte in the buffer to be written. after all address bits are shifted in, the part will take data from the si pin and store it in one of the data buffers. if the end of the buffer is reached, the device will wrap arou nd back to the beginning of the buffer. when there is a low-to-high transition on the cs pin, the part will first erase the selected page in main memory to all 1s and then program the data stored in the buffer into the specified page in the main memory. both the erase and the programming of the page are internally self-timed and should take place in a maximum of time t ep . during this time, the status register will indicate that the part is busy. additional commands main memory page to buffer transfer: a page of data can be transferred from the main memory to either buffer 1 or buffer 2. to start the operation, an 8-bit opcode, 53h for buffer 1 and 55h for buffer 2, must be followed by the three reserved bits, 12 address bits (pa11 - pa0) which specif y the page in main memory that is to be transferred, and nine don?t care bits. the cs pin must be low while toggling the sck pin to load the opcode, the address bits, and the don?t care bits from the si pin. the transfer of the page of data from the main memory to the buffer will begin when the cs pin tran- sitions from a low to a high state. during the transfer of a page of data (t xfr ), the status register can be read to determine whether the transfer has been completed or not. main memory page to buffer compare: a page of data in main memory can be compared to the data in buffer 1 or buffer 2. to initiate the operation, an 8-bit opcode, 60h for buffer 1 and 61h for buffer 2, must be followed by 24 address bits consisting of the three reserved bits, 12 address bits (pa11 - pa0) which specify the page in the main memory that is to be compared to the buffer, and nine don?t care bits. the cs pin must be low while toggling the sck pin to load the opcode, the address bits, and the don?t care bits from the si pin. on the low-to-high transition of the cs pin, the 264 bytes in the selected main memory page will be compared with the 264 byte s in buffer 1 or buffer 2. during this time (t xfr ), the status register will indicate that the part is busy. on comple- tion of the compare operation, bit 6 of the status register is updated with the result of the compare. auto page rewrite: this mode is only needed if multiple bytes within a page or multiple pages of data are modified in a random fashion. this mode is a combination of two operations: main memory page to buffer transfer and buffer to main memory page program with built-in erase. a page of data is first transferred from the main memory to buffer 1 or buffer 2, and then the same data (from buffer 1 or buffer 2) is programmed back into its original page of main memory. to start the rewrite operation, an 8-bit opcode, 58h for buffer 1 or 59h for buffer 2, must be followed by the three reserved bits, 12 address bits (pa11 - pa0) that specify the page in main memory to be rewritten, and nine additional don?t care bits. when a low-to-high transition occurs on the cs pin, the part will first transfer data from the page in main memory to a buffer and then program the data from the buffer back into same page of main memory. the operation is inter- nally self-timed and should take place in a maximum time of t ep . during this time, the status register will indica te that the part is busy.
8 at45db081b 2225i?dflsh?9/05 if a sector is programmed or reprogrammed sequentially page-by-page, then the pro- gramming algorithm shown in figure 1 on page 26 is recommended. otherwise, if multiple bytes in a page or several pages are programmed randomly in a sector, then the programming algorithm shown in figure 2 on page 27 is recommended. each page within a sector must be updated/rewritten at least once within every 10,000 cumulative page erase/program operations in that sector. operation mode summary the modes described can be separated into two groups ? modes which make use of the flash memory array (group a) and modes which do not make use of the flash memory array (group b). group a modes consist of: 1. main memory page read 2. main memory page to buffer 1 (or 2) transfer 3. main memory page to buffer 1 (or 2) compare 4. buffer 1 (or 2) to main memory page program with built-in erase 5. buffer 1 (or 2) to main memory page program without built-in erase 6. page erase 7. block erase 8. main memory page program through buffer 9. auto page rewrite group b modes consist of: 1. buffer 1 (or 2) read 2. buffer 1 (or 2) write 3. status register read if a group a mode is in progress (not fully completed) then another mode in group a should not be started. however, during th is time in which a group a mode is in progress, modes in group b can be started. this gives the serial dataflash the ability to virtually accommodate a continuous data stream. while data is being programmed into main memory from buffer 1, data can be loaded into buffer 2 (or vice versa). see application note an-4 (?using atmel?s serial dataflash?) for more details. pin descriptions serial input (si): the si pin is an input-only pin and is used to shift data into the device. the si pin is used for all data in put including opcodes and address sequences. serial output (so): the so pin is an output-only pin and is used to shift data out from the device. serial clock (sck): the sck pin is an input-only pin and is used to control the flow of data to and from the dataflash. data is always clocked into the device on the rising edge of sck and clocked out of the device on the falling edge of sck. chip select (cs ): the dataflash is selected when the cs pin is low. when the device is not selected, data will not be accepted on the si pin, and the so pin will remain in a high-impedance state. a high-to-low transition on the cs pin is required to start an operation, and a low-to-high transition on the cs pin is required to end an operation.
9 at45db081b 2225i?dflsh?9/05 write protect: if the wp pin is held low, the first 256 pages of the main memory cannot be reprogrammed. the only way to reprogram the first 256 pages is to first drive the protect pin high and then use the program commands previously mentioned. if this pin and feature are not utilized it is recommended that the wp pin be driven high externally. reset : a low state on the reset pin (reset ) will terminate the operation in progress and reset the internal state ma chine to an idle state. the device will remain in the reset condition as long as a low level is present on the reset pin. normal operation can resume once the reset pin is brought back to a high level. the device incorporates an internal power-on reset circuit, so there are no restrictions on the reset pin during power-on sequences. if this pin and feature are not utilized it is recommended that the reset pin be driven high externally. ready/busy : this open drain output pin will be driv en low when the device is busy in an internally self-timed operation. this pin, which is normally in a high state (through a1k ? external pull-up resistor ), will be pulled low during pr ogramming operations, com- pare operations, and during page-to-buffer transfers. the busy status indicates that the flash memory array and one of the buffers cannot be accessed; read and wr ite operations to the other buff er can still be performed. power-on/reset state when power is first applied to the device, or when recovering from a reset condition, the device will default to spi mo de 3. in addition, the so pin will be in a high-impedance state, and a high-to-low transition on the cs pin will be required to start a valid instruc- tion. the spi mode will be automatica lly selected on every falling edge of cs by sampling the inactive clock state. after power is applied and v cc is at the minimum datasheet value, the system should wait 20 ms before an operatio nal mode is started.
10 at45db081b 2225i?dflsh?9/05 note: in tables 2 and 3, an sck mode designation of ?any? denotes an y one of the four modes of operation (inactive clock polarit y low, inactive clock polarity high, spi mode 0, or spi mode 3). table 1. read commands command sck mode opcode continuous array read inactive clock polarity low or high 68h spi mode 0 or 3 e8h main memory page read inactive clock polarity low or high 52h spi mode 0 or 3 d2h buffer 1 read inactive clock polarity low or high 54h spi mode 0 or 3 d4h buffer 2 read inactive clock polarity low or high 56h spi mode 0 or 3 d6h status register read inactive clock polarity low or high 57h spi mode 0 or 3 d7h table 2. program and erase commands command sck mode opcode buffer 1 write any 84h buffer 2 write any 87h buffer 1 to main memory page program with built-in erase any 83h buffer 2 to main memory page program with built-in erase any 86h buffer 1 to main memory page program without built-in erase any 88h buffer 2 to main memory page program without built-in erase any 89h page erase any 81h block erase any 50h main memory page program through buffer 1 any 82h main memory page program through buffer 2 any 85h table 3. additional commands command sck mode opcode main memory page to buffer 1 transfer any 53h main memory page to buffer 2 transfer any 55h main memory page to buffer 1 compare any 60h main memory page to buffer 2 compare any 61h auto page rewrite through buffer 1 any 58h auto page rewrite through buffer 2 any 59h
11 at45db081b 2225i?dflsh?9/05 note: r = reserved bit p = page address bit b = byte/buffer address bit x = don?t care table 4. detailed bit-level addressing sequence opcode opcode address byte address byte address byte additional don?t care bytes required 50h 01010000r r r ppppppppp xxxxxxxxxxxx n/a 52h 01010010r r r pppppppppppp bbbbbbbbb 4 bytes 53h 01010011r r r pppppppppppp xxxxxxxxx n/a 54h 01010100x x x xxxxxxxxxxxx bbbbbbbbb 1 byte 55h 01010101r r r pppppppppppp xxxxxxxxx n/a 56h 01010110x x x xxxxxxxxxxxx bbbbbbbbb 1 byte 57h 01010111 n/a n/a n/a n/a 58h 01011000r r r pppppppppppp xxxxxxxxx n/a 59h 01011001r r r pppppppppppp xxxxxxxxx n/a 60h 01100000r r r pppppppppppp xxxxxxxxx n/a 61h 01100001r r r pppppppppppp xxxxxxxxx n/a 68h 01101000r r r pppppppppppp bbbbbbbbb 4 bytes 81h 10000001r r r pppppppppppp xxxxxxxxx n/a 82h 10000010r r r pppppppppppp bbbbbbbbb n/a 83h 10000011r r r pppppppppppp xxxxxxxxx n/a 84h 10000100x x x xxxxxxxxxxxx bbbbbbbbb n/a 85h 10000101r r r pppppppppppp bbbbbbbbb n/a 86h 10000110r r r pppppppppppp xxxxxxxxx n/a 87h 10000111x x x xxxxxxxxxxxx bbbbbbbbb n/a 88h 10001000r r r pppppppppppp xxxxxxxxx n/a 89h 10001001r r r pppppppppppp xxxxxxxxx n/a d2h 11010010r r r pppppppppppp bbbbbbbbb 4 bytes d4h 11010100x x x xxxxxxxxxxxx bbbbbbbbb 1 byte d6h 11010110x x x xxxxxxxxxxxx bbbbbbbbb 1 byte d7h 11010111 n/a n/a n/a n/a e8h 11101000r r r pppppppppppp bbbbbbbbb 4 bytes r eserve d r eserve d r eserve d pa 11 pa 10 pa 9 pa 8 pa 7 pa 6 pa 5 pa 4 pa 3 pa 2 pa 1 pa 0 ba 8 ba 7 ba6 ba 5 ba4 ba 3 ba 2 ba1 ba0
12 at45db081b 2225i?dflsh?9/05 note: 1. after power is applied and v cc is at the minimum specified da tasheet value, the system should wait 20 ms before an opera- tional mode is started. note: 1. i cc1 during a buffer read is 20ma maximum. absolute maximum ratings* temperature under bias .... ........... ............ ..... -55 c to +125 c *notice: stresses beyond those listed under ?absolute maximum ratings? may cause permanent dam- age 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. storage temperature ..................................... -65 c to +150 c all input voltages (including nc pins) with respect to ground ...................................-0.6v to +6.25v all output voltages with respect to ground .............................-0.6v to v cc + 0.6v dc and ac operating range at45db081b (2.5v version) at45db081b operating temperature (case) com. 0 c to 70 c0 c to 70 c ind. ? -40 c to 85 c v cc power supply (1) 2.5v to 3.6v 2.7v to 3.6v dc characteristics symbol parameter condition min typ max units i sb standby current cs , reset , wp = v cc , all inputs at cmos levels 210a i cc1 (1) active current, read operation f = 20 mhz; i out = 0 ma; v cc = 3.6v 410ma i cc2 active current, program/erase operation v cc = 3.6v 15 35 ma i li input load current v in = cmos levels 1 a i lo output leakage current v i/o = cmos levels 1 a v il input low voltage 0.6 v v ih input high voltage 2.0 v v ol output low voltage i ol = 1.6 ma; v cc = 2.7v 0.4 v v oh output high voltage i oh = -100 a v cc - 0.2v v
13 at45db081b 2225i?dflsh?9/05 ac characteristics symbol parameter at45db081b (2.5v version) at45db081b units min max min max f sck sck frequency 15 20 mhz f car sck frequency for continuous array read 15 20 mhz t wh sck high time 30 22 ns t wl sck low time 30 22 ns t cs minimum cs high time 250 250 ns t css cs setup time 250 250 ns t csh cs hold time 250 250 ns t csb cs high to rdy/busy low 200 200 ns t su data in setup time 10 5 ns t h data in hold time 15 10 ns t ho output hold time 0 0 ns t dis output disable time 20 18 ns t v output valid 25 20 ns t xfr page to buffer transfer/compare time 300 250 s t ep page erase and programming time 20 20 ms t p page programming time 14 14 ms t pe page erase time 8 8 ms t be block erase time 12 12 ms t rst reset pulse width 10 10 s t rec reset recovery time 1 1 s
14 at45db081b 2225i?dflsh?9/05 input test waveforms and measurement levels t r , t f < 3 ns (10% to 90%) output test load ac waveforms two different timing diagrams are show n below. waveform 1 shows the sck signal being low when cs makes a high-to-low transition, and waveform 2 shows the sck sig- nal being high when cs makes a high-to-low transition. both waveforms show valid timing diagrams. the setup and hold times for the si signal are referenced to the low-to- high transition on the sck signal. waveform 1 shows timing that is also compatible with spi mode 0, and waveform 2 shows timing that is compatible with spi mode 3. waveform 1 ? inactive clock po larity low and spi mode 0 waveform 2 ? inactive clock polarity high and spi mode 3 ac driving levels ac measurement level 0.45v 2.0 0.8 2.4v device under test 30 pf cs sck si so t css valid in t h t su t wh t wl t csh t cs t v high impedance valid out t ho t dis high impedance cs sck si so t css valid in t h t su t wl t wh t csh t cs t v high z valid out t ho t dis high impedance
15 at45db081b 2225i?dflsh?9/05 reset timing (inactive clock polarity low shown) note: the cs signal should be in th e high state before the reset signal is deasserted. command sequence for read/write operat ions (except stat us register read) notes: 1. ?r? designates bits rese rved for larger densities. 2. it is recommended that ?r? be a logical ?0 ? for densities of 8m bits or smaller. 3. for densities larger than 8m bits, the ?r? bits become the most significant page address bi t for the appropr iate density. cs sck reset so high impedance high impedance si t rst t rec t css si cmd 8 bits 8 bits 8 bits msb reserved for larger densities page address (pa11-pa0) byte/buffer address (ba8-ba0/bfa8-bfa0) lsb r r r x x x x x x x x x x x x x x x x x x x x x
16 at45db081b 2225i?dflsh?9/05 write operations the following block diagram and waveforms illustrate the various write sequences available. main memory page program through buffers buffer write buffer to main memory page program (dat a from buffer progra mmed into flash page) flash memory array page (256 bytes) buffer 2 (256 bytes) buffer 1 (256 bytes) i/o interface si buffer 1 to page program page program through buffer 2 buffer 2 to page program page program through buffer 1 buffer 1 write buffer 2 write si cmd n n+1 last byte completes writing into selected buffer starts self-timed erase/program operation cs rrr, pa11-7 pa6-0, bfa8 bfa7-0 si cmd x xx, bfa8 bfa7-0 n n+1 last byte completes writing into selected buffer cs si cmd rrr, pa11-7 pa6-0, x cs starts self-timed erase/program operation x each transition represents 8 bits and 8 clock c y cles n = 1st byte read n+1 = 2nd byte read
17 at45db081b 2225i?dflsh?9/05 read operations the following block diagram and waveforms illustrate the various read sequences available. main memory page read main memory page to buff er transfer (data from fl ash page read into buffer) buffer read flash memory array page (264 bytes) buffer 2 (264 bytes) buffer 1 (264 bytes) i/o interface main memory page to buffer 1 main memory page to buffer 2 main memory page read buffer 1 read buffer 2 read so si cmd rrr, pa11-7 pa6-0, ba8 ba7-0 x xxx cs n n+1 so si cmd rrr, pa11-7 pa6-0, x x starts reading page data into buffer cs so si cmd x xx, bfa8 bfa7-0 cs n n+1 so x each transition represents 8 bits and 8 clock c y cles n = 1st byte read n+1 = 2nd byte read
18 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? inactive clock polarity low continuous array read (opcode: 68h) main memory page read (opcode: 52h) si 0 1xx cs so sck 12 63 64 65 66 67 68 high-impedance d 7 d 6 d 5 d 2 d 1 d 0 d 7 d 6 d 5 data out bit 0 of page n+1 bit 2111 of page n lsb msb t su t v si 0 1 0 10 xxx cs so sck 12345 60 61 62 63 64 65 66 67 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v
19 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? inac tive clock polarity low (continued) buffer read (opcode: 54h or 56h) status register read (opcode: 57h) si 0 1 0 10 xxx cs so sck 12345 36 37 38 39 40 41 42 43 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v si 0 1 0 10 111 cs so sck 12345 78910 11 12 16 17 high-impedance d 7 d 6 d 5 status register output command opcode msb t su t v 6 d 1 d 0 d 7 lsb msb
20 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? inactive clock polarity high continuous array read (opcode: 68h) main memory page read (opcode: 52h) si 0 1xxx cs so sck 12 63 64 65 66 67 high-impedance d 7 d 6 d 5 d 2 d 1 d 0 d 7 d 6 d 5 bit 0 of page n+1 bit 2111 of page n lsb msb t su t v data out si 0 1 0 10 xxx cs so sck 12345 61 62 63 64 65 66 67 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v d 4 68
21 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? inac tive clock polarity high (continued) buffer read (opcode: 54h or 56h) status register read (opcode: 57h) si 0 1 0 10 xxx cs so sck 12345 37 38 39 40 41 42 43 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v d 4 44 si 0 1 0 10 111 cs so sck 12345 78910 11 12 17 18 high-impedance d 7 d 6 d 5 status register output command opcode msb t su t v 6 d 4 d 0 d 7 lsb msb d 6
22 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? spi mode 0 continuous array read (opcode: e8h) main memory page read (opcode: d2h) si 1 1xxx cs so sck 12 62 63 64 65 66 67 high-impedance d 7 d 6 d 5 d 2 d 1 d 0 d 7 d 6 d 5 data out bit 0 of page n+1 bit 2111 of page n lsb msb t su t v si 1 1 0 10 xxx cs so sck 12345 60 61 62 63 64 65 66 67 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v d 4
23 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? spi mode 0 buffer read (opcode: d4h or d6h) status register read (opcode: d7h) si 1 1 0 10 xxx cs so sck 12345 36 37 38 39 40 41 42 43 xx high-impedance command opcode t su d 7 d 6 d 5 data out msb t v d 4 si 1 1 0 10 111 cs so sck 12345 78910 11 12 16 17 high-impedance status register output command opcode msb t su 6 d 1 d 0 d 7 lsb msb d 7 d 6 d 5 t v d 4
24 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? spi mode 3 continuous array read (opcode: e8h) main memory page read (opcode: d2h) si 1 1xxx cs so sck 12 63 64 65 66 67 high-impedance d 7 d 6 d 5 d 2 d 1 d 0 d 7 d 6 d 5 bit 0 of page n+1 bit 2111 of page n lsb msb t su t v data out si 1 1 0 10 xxx cs so sck 12345 61 62 63 64 65 66 67 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v d 4 68
25 at45db081b 2225i?dflsh?9/05 detailed bit-level read timing ? spi mode 3 (continued) buffer read (opcode: d4h or d6h) status register read (opcode: d7h) si 1 1 0 10 xxx cs so sck 12345 37 38 39 40 41 42 43 xx high-impedance d 7 d 6 d 5 data out command opcode msb t su t v d 4 44 si 1 1 0 10 111 cs so sck 12345 78910 11 12 17 18 high-impedance d 7 d 6 d 5 status register output command opcode msb t su t v 6 d 4 d 0 d 7 lsb msb d 6
26 at45db081b 2225i?dflsh?9/05 figure 1. algorithm for sequentially programming or reprogramming the entire array notes: 1. this type of algorithm is used for applications in wh ich the entire array is programmed sequentially, filling the array page-by- page. 2. a page can be written using either a main memory page progra m operation or a buffer write operation followed by a buffer to main memory page program operation. 3. the algorithm above shows the programming of a single page . the algorithm will be repeated sequentially for each page within the entire array. start main memory page program through buffer (82h, 85h) end provide address and data buffer write (84h, 87h) buffer to main memory page program (83h, 86h)
27 at45db081b 2225i?dflsh?9/05 figure 2. algorithm for randomly modifying data notes: 1. to preserve data integrity, each page of a dataflash se ctor must be updated/rewritten at least once within every 10,000 cumulative page erase/program operations. 2. a page address pointer must be maintained to indicate wh ich page is to be rewritten. the auto page rewrite command must use the address specified by the page address pointer. 3. other algorithms can be used to rewrite portions of the flash array. low-power applications may choose to wait until 10,000 cumulative page erase/program operations have accumulated be fore rewriting all pages of t he sector. see application note an-4 (?using atmel?s serial da taflash?) for more details. sector addressing pa11 pa10 pa9 pa8 pa7 pa6 pa5 pa4 pa3 pa2 - pa0 secto r 000000000x0 0000 xxxxxx1 0001 xxxxxx2 0 0 1xxxxxxx3 1 0 0xxxxxxx6 1 0 1xxxxxxx7 1 1 0xxxxxxx8 1 1 1xxxxxxx9 start main memory page to buffer transfer (53h, 55h) increment page address pointer (2) auto page rewrite (2) (58h, 59h) end provide address of page to modify if planning to modify multiple bytes currently stored within a page of the flash array main memory page program through buffer (82h, 85h) buffer write (84h, 87h) buffer to main memory page program (83h, 86h)
28 at45db081b 2225i?dflsh?9/05 note: green packages cover lead-free requirements. ordering information f sck (mhz) i cc (ma) ordering code package operation range active standby 20 10 0.01 at45db081b-cc at45db081b-cnc at45db081b-rc at45db081b-tc 14c1 8cn3 28r 28t commercial (0 c to 70 c) 20 10 0.01 at45db081b-ci at45db081b-cni at45db081b-ri at45db081b-ti 14c1 8cn3 28r 28t industrial (-40 c to 85 c) 15 10 0.01 at45db081b-cc-2.5 at45db081b-cnc-2.5 at45db081b-rc-2.5 at45db081b-tc-2.5 14c1 8cn3 28r 28t commercial (0 c to 70 c) 2.5v to 3.6v green packaging options (pb/halide-free) f sck (mhz) i cc (ma) ordering code package operation range active standby 20 10 0.01 at45db081b-cnu at45db081b-ru AT45DB081B-TU at45db081b-cu 8cn3 28r 28t 14c1 industrial (-40 c to 85 c) package type 14c1 14-ball (3 x 5 array), plastic chip -scale ball grid array (cbga) 8cn3 8-pad (6 mm x 8 mm ) chip array small outline no lead package (cason ) 28r 28-lead, 0.330" wide, plastic gull wing small outline package (soic) 28t 28-lead, plastic thin small outline package (tsop)
29 at45db081b 2225i?dflsh?9/05 packaging information 14c1 ? cbga 2325 orchard parkway san jose, ca 95131 title drawing no. r rev. 14c1 , 14-ball (3 x 5 array), 4.5 x 7 x 1.4 mm body, 1.0 mm ball pitch chip-scale ball grid array package (cbga) a 14c1 04/11/01 dimensions in millimeters and (inches). controlling dimension: millimeters. a b c d e 321 4.0 (0.157) 1.25 (0.049) ref 0.46 (0.018) dia ball typ 2.0 (0.079) 7.10(0.280) 6.90(0.272) 1.40 (0.055) max 0.30 (0.012)min 4.60(0.181) 4.40(0.173) 1.00 (0.0394) bsc non-accumulative 1.50 (0.059) ref a1 id 1.00 (0.0394) bsc non-accumulative top view side view bottom view
30 at45db081b 2225i?dflsh?9/05 8cn3 ? cason 2325 orchard parkway san jose, ca 95131 title drawing no. r rev. 8cn3, 8-pad (6 x 8 x 1.0 mm body), lead pitch 1.27 mm, chip array small outline no lead package (cason) b 8cn3 7/10/03 notes: 1. all dimensions and tolerance conform to asme y 14.5m, 1994. 2. the surface finish of the package shall be edm charmille #24-27. 3. unless otherwise specified tolerance: decimal 0.05, angular 2 o . 4. metal pad dimensions. common dimensions (unit of measure = mm) symbol min nom max note a 1.0 a1 0.17 0.21 0.25 b 0.41 typ 4 d 7.90 8.00 8.10 e 5.90 6.00 6.10 e 1.27 bsc e1 1.095 ref l 0.67 typ 4 l1 0.92 0.97 1.02 4 pin1 pad corner marked pin1 indentifier 0.10 mm typ 4 3 2 1 5 6 7 8 top view l b e l1 e1 side view a1 a bottom view e d
31 at45db081b 2225i?dflsh?9/05 28r ? soic a 2. 3 9 ? 2.79 a1 0.050 ? 0. 3 56 d 1 8 .00 ? 1 8 .50 note 1 e 11.70 ? 12.50 e 1 8 .59 ? 8 .79 note 1 b 0. 3 56 ? 0.50 8 c 0.20 3 ? 0. 3 05 l 0.94 ? 1.27 e 1.27 typ pin 1 0o ~ 8 o 2 3 25 orch a rd p a rkw a y sa n jo s e, ca 951 3 1 title drawing no. r rev. 2 8 r, 2 8 -le a d, 0. 33 0" body width, pl as tic g u ll wing s m a ll o u tline ( s oic) c 2 8 r 5/1 8 /2004 common dimen s ion s (unit of me asu re = mm) s ymbol min nom max note a e c a 1 e 1 e d l b note: 1. dimen s ion s d a nd e1 do not incl u de mold fl as h or protr us ion. mold fl as h or protr us ion s h a ll not exceed 0.25 mm (0.010").
32 at45db081b 2225i?dflsh?9/05 28t ? tsop 2325 orchard parkway san jose, ca 95131 title drawing no. r rev. 28t , 28-lead (8 x 13.4 mm) plastic thin small outline package, type i (tsop) c 28t 12/06/02 pin 1 0o ~ 5o d1 d pin 1 identifier area b e e a a1 a2 c l gage plane seating plane l1 common dimensions (unit of measure = mm) symbol min nom max note notes: 1. this package conforms to jedec reference mo-183. 2. dimensions d1 and e do not include mold protrusion. allowable protrusion on e is 0.15 mm per side and on d1 is 0.25 mm per side. 3. lead coplanarity is 0.10 mm maximum. a ? ? 1.20 a1 0.05 ? 0.15 a2 0.90 1.00 1.05 d 13.20 13.40 13.60 d1 11.70 11.80 11.90 note 2 e 7.90 8.00 8.10 note 2 l 0.50 0.60 0.70 l1 0.25 basic b 0.17 0.22 0.27 c 0.10 ? 0.21 e 0.55 basic
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