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fm25v02a 256-kbit (32k 8) serial (spi) f-ram cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document number: 001-90865 rev. *f revised january 14, 2016 256-kbit (32k 8) serial (spi) f-ram features 256-kbit ferroelectric random access memory (f-ram) logically organized as 32k 8 ? high-endurance 100 trillion (10 14 ) read/writes ? 151-year data retention (see the data retention and endurance table) ? nodelay? writes ? advanced high-reliability ferroelectric process very fast serial peripheral interface (spi) ? up to 40-mhz frequency ? direct hardware replacement for serial flash and eeprom ? supports spi mode 0 (0, 0) and mode 3 (1, 1) sophisticated write-protection scheme ? hardware protection using the write protect (wp ) pin ? software protection using write disable instruction ? software block protection for 1/4, 1/2, or entire array device id ? manufacturer id and product id low power consumption ? 2.5-ma active current at 40 mhz ? 150- ? a standby current ? 8- ? a sleep mode current low-voltage operation: v dd = 2.0 v to 3.6 v industrial temperature: ?40 ? c to +85 ? c packages ? 8-pin small outline integrated circuit (soic) package ? 8-pin dual flat no-leads (dfn) package restriction of hazardous substances (rohs) compliant functional description the fm25v02a is a 256-kbit nonvolatile memory employing an advanced ferroelectric process. an f-ram is nonvolatile and performs reads and writes similar to a ram. it provides reliable data retention for 151 years while eliminating the complexities, overhead, and system-level reliab ility problems caused by serial flash, eeprom, and other nonvolatile memories. unlike serial flash and eeprom, the fm25v02a performs write operations at bus speed. no write delays are incurred. data is written to the memory array immediately after each byte is successfully transferred to the device. the next bus cycle can commence without the need for data polling. in addition, the product offers substantial write endurance compared with other nonvolatile memories. the fm25v02a is capable of supporting 10 14 read/write cycles, or 100 million times more write cycles than eeprom. these capabilities make the fm25v02a ideal for nonvolatile memory applications requirin g frequent or rapid writes. examples range from data loggin g, where the number of write cycles may be critical, to demanding industrial controls where the long write time of serial flash or eeprom can cause data loss. the fm25v02a provides substantia l benefits to users of serial eeprom or flash as a hardwa re drop-in replacement. the fm25v02a uses the high-speed spi bus, which enhances the high-speed write capability of f-ram technology. the device incorporates a read-only device id that allows the host to determine the manufacturer, product density, and product revision. the device specific ations are guaranteed over an industrial range of ?40 ? c to +85 ? c. for a complete list of related resources, click here . logic block diagram instruction decoder clock generator control logic write protect instruction register address register counter 32 k x 8 f-ram array 15 data i/ o register 8 nonvolatile status register 3 wp cs hold sck so si
fm25v02a document number: 001-90865 rev. *f page 2 of 23 contents pinouts .............................................................................. 3 pin definitions .................................................................. 3 functional overview ........................................................ 4 memory architecture ........................................................ 4 serial peripheral interface - spi bus .............................. 4 spi overview ............................................................... 4 spi modes ................................................................... 5 power-up to first access ....... ..................................... 6 command structure .................................................... 6 wren - set write enable latch .......... .............. ......... 6 wrdi - reset write enable latch ............................... 6 status register and write prot ection ............................. 7 rdsr - read status register ..................................... 7 wrsr - write status register .................................... 7 memory operation ............................................................ 8 write operation ........................................................... 8 read operation ........................................................... 8 fast read operation ................................................... 8 hold pin operation ................................................. 10 sleep mode ............................................................... 10 device id ................................................................... 11 endurance ................................................................. 12 maximum ratings ........................................................... 13 operating range ............................................................. 13 dc electrical characteristics ........................................ 13 data retention and endurance ..................................... 14 capacitance .................................................................... 14 thermal resistance ........................................................ 14 ac test conditions ........................................................ 14 ac switching characteristics ....................................... 15 power cycle timing ....................................................... 17 ordering information ...................................................... 18 ordering code definitions ..... .................................... 18 package diagrams .......................................................... 19 acronyms ........................................................................ 21 document conventions ................................................. 21 units of measure ....................................................... 21 document history page ................................................. 22 sales, solutions, and legal information ...................... 23 worldwide sales and design s upport ......... .............. 23 products .................................................................... 23 psoc? solutions ...................................................... 23 cypress developer community ................................. 23 technical support ................. .................................... 23
fm25v02a document number: 001-90865 rev. *f page 3 of 23 pinouts figure 1. 8-pin soic pinout figure 2. 8-pin dfn pinout pin definitions pin name i/o type description sck input serial clock . all i/o activity is synchronized to the serial clock. inputs are latched on the rising edge and outputs occur on the falling edge. because the device is synchronous, the clock frequency may be any value between 0 and 40 mhz and may be interrupted at any time. cs input chip select . this active low input activates the dev ice. when high, the device enters the low-power standby mode, ignores other inputs, and the output is tristated. when low, the device internally activates the sck signal. a falling edge on cs must occur before every opcode. si [1] input serial input . all data is input to the device on this pin. the pin is sampled on the rising edge of sck and is ignored at other times. it should always be driven to a valid logic level to meet i dd specifica- tions. so [1] output serial output . this is the data output pin. it is driven during a read a nd remains tristated at all other times including when hold is low. data transitions are driven on the falling edge of the serial clock. wp input write protect . this active low pin prevents write oper ation to the status register when wpen is set to ?1?. this is critical be cause other write protec tion features are controlled through the status register. a complete explanation of write protection is provided on status register and write protection on page 7 . this pin must be tied to v dd if not used. hold input hold pin . the hold pin is used when the host cpu must in terrupt a memory operation for another task. when hold is low, the current operation is su spended. the device ignores any transition on sck or cs . all transitions on hold must occur while sck is low. this pin has a weak internal pull-up (refer to the r in spec in dc electrical characteristics ). v ss power supply ground for the device. must be connected to the ground of the system. v dd power supply power supply input to the device. exposed pad no connect the exposed pad on the bottom of 8-pi n dfn package is not connected to the die. the exposed pad should not be soldered on the pcb. hold sck 1 2 3 4 5 cs 8 7 6 v dd si so top view not to scale v ss wp so cs v ss wp si v dd sck hold 1 2 45 6 7 8 3 o pad exposed top view not to scale note 1. si may be connected to so for a single pin data interface .
fm25v02a document number: 001-90865 rev. *f page 4 of 23 functional overview the fm25v02a is a serial f-ra m memory. the memory array is logically organized as 32,768 8 bits and is accessed using an industry-standard serial peripheral interface (spi) bus. the functional operation of the f-ram is similar to serial flash and serial eeproms. the major diff erence between the fm25v02a and a serial flash or eeprom with the same pinout is the f-ram's superior write performance, high endurance, and low power consumption. memory architecture when accessing the fm25v02a, the user addresses 32k locations of eight data bits each. these eight data bits are shifted in or out serially. the addresses are accessed using the spi protocol, which includes a chip select (to permit multiple devices on the bus), an opcode, and a tw o-byte address. the upper bit of the address range is 'don't care' value. the complete address of 15 bits specifies each byte address uniquely. most functions of the fm25v02a are either controlled by the spi interface or are handled by on-board circuitry. the access time for the memory operation is essentially zero, beyond the time needed for the serial protocol. th at is, the memory is read or written at the speed of the spi bus. unlike a serial flash or eeprom, it is not necessary to poll the device for a ready condition because writes occur at bus speed. by the time a new bus transaction can be shifted in to the device, a write operation is complete. this is explained in more detail in memory operation on page 8 . serial peripheral in terface - spi bus the fm25v02a is a spi slave devi ce and operates at speeds up to 40 mhz. this high-speed serial bus provides high-perfor- mance serial communication to a spi master. many common microcontrollers have hardware spi ports allowing a direct interface. it is quite simple to emulate the port using ordinary port pins for microcontrollers that do not. the fm25v02a operates in spi mode 0 and 3. spi overview the spi is a four-pin inte rface with chip select (cs ), serial input (si), serial output (so), a nd serial clock (sck) pins. the spi is a synchronous serial interface, which uses clock and data pins for memory access and supports multiple devices on the data bus. a device on the spi bus is activated using the cs pin. the relationship between chip select, clock, and data is dictated by the spi mode. this device supports spi modes 0 and 3. in both of these modes, data is clocked into the f-ram on the rising edge of sck starting from the first rising edge after cs goes active. the spi protocol is controlled by opcodes. these opcodes specify the commands from the bus master to the slave device. after cs is activated, the first byte transferred from the bus master is the opcode. followin g the opcode, any addresses and data are then transferred. the cs must go inactive after an operation is complete and before a new opcode can be issued. the commonly used terms in the spi protocol are as follows: spi master the spi master device controls the operations on a spi bus. an spi bus may have only one master with one or more slave devices. all the slaves share the same spi bus lines and the master may select any of t he slave devices using the cs pin. all of the operations must be initiated by the master activating a slave device by pulling the cs pin of the slave low. the master also generates the sck and all the data transmission on si and so lines are synchronize d with this clock. spi slave the spi slave device is activated by the master through the chip select line. a slave device gets th e sck as an input from the spi master and all the communicat ion is synchronized with this clock. an spi slave never in itiates a communication on the spi bus and acts only on the instruction from the master. the fm25v02a operates as an spi slave and may share the spi bus with other spi slave devices. chip select (cs ) to select any slave device, the master needs to pull down the corresponding cs pin. any instruction can be issued to a slave device only while the cs pin is low. when the device is not selected, data through the si pin is ignored and the serial output pin (so) remains in a high-impedance state. note a new instruction must begin with the falling edge of cs . therefore, only one opcode can be issued for each active chip select cycle. serial clock (sck) the serial clock is generated by the spi master and the communication is synchronized with this clock after cs goes low. the fm25v02a enables spi modes 0 and 3 for data communi- cation. in both of these modes, the inputs are latched by the slave device on the rising edge of sck and outputs are issued on the falling edge. therefore, the first rising edge of sck signifies the arrival of the first bit (msb) of a spi instruction on the si pin. further, all data inputs and outputs are synchronized with sck. data transmission (si/so) the spi data bus consists of two lines, si and so, for serial data communication. si is also referred to as master out slave in (mosi) and so is referred to as master in slave out (miso). the master issues instructions to t he slave through the si pin, while the slave responds through the so pin. multiple slave devices may share the si and so lines as described earlier. the fm25v02a has two separate pins for si and so, which can be connected with the master as shown in figure 3 .
fm25v02a document number: 001-90865 rev. *f page 5 of 23 for a microcontroller that has no dedicated spi bus, a general-purpose port may be used. to reduce hardware resources on the controller, it is possible to connect the two data pins (si, so) together and tie off (high) the hold and wp pins. figure 4 shows such a configuration, which uses only three pins. most significant bit (msb) the spi protocol requires that the first bit to be transmitted is the most significant bit (msb). this is valid for both address and data transmission. the 256-kbit serial f-ram requires a 2-byte address for any read or write operation. because the address is only 15 bits, the upper bit which is fed in is ignored by the device. although the upper bit is ?don?t care?, cypress recommends that these bits be set to 0s to enable seamless transition to higher memory densities. serial opcode after the slave device is selected with cs going low, the first byte received is treated as the opcode for the intended operation. fm25v02a uses the standard opcodes for memory accesses. invalid opcode if an invalid opcode is received, the opcode is ignored and the device ignores any additional serial data on the si pin until the next falling edge of cs , and the so pin remains tristated. status register fm25v02a has an 8-bit status register. the bits in the status register are used to configure the device. these bits are described in table 3 on page 7 . spi modes fm25v02a may be driven by a microcontroller with its spi peripheral running in either of the following two modes: spi mode 0 (cpol = 0, cpha = 0) spi mode 3 (cpol = 1, cpha = 1) for both these modes, the input data is latched in on the rising edge of sck starting from the first rising edge after cs goes active. if the clock starts from a high state (in mode 3), the first rising edge after the clock toggles is considered. the output data is available on the falling edge of sck.the two spi modes are shown in figure 5 on page 6 and figure 6 on page 6 . the status of the clock when the bus master is not transferring data is: sck remains at 0 for mode 0 sck remains at 1 for mode 3 figure 3. system configuration with spi port figure 4. system conf iguration without spi port cs1 cs2 hold1 hold2 fm25v02a fm25v02a wp1 wp2 sck si so sck si so cs hold wp cs hold wp sck mosi miso spi microcontroller fm25v02a microcontroller sck si so cs hold wp p1.2 p1.1 p1.0
fm25v02a document number: 001-90865 rev. *f page 6 of 23 the device detects the spi mode fr om the status of the sck pin when the device is selected by bringing the cs pin low. if the sck pin is low when the device is selected, spi mode 0 is assumed and if the sck pin is high, it works in spi mode 3. power-up to first access the fm25v02a is not accessible for a t pu time after power-up. users must comply with the timing parameter t pu , which is the minimum time from v dd (min) to the first cs low. command structure there are nine commands, call ed opcodes, that can be issued by the bus master to the fm25v02a. they are listed in table 1 . these opcodes control the functions performed by the memory. wren - set write enable latch the fm25v02a will power up with writes disabled. the wren command must be issued before any write operation. sending the wren opcode allows the user to issue subsequent opcodes for write operations. these incl ude writing the status register (wrsr) and writing the memory (write). sending the wren opcode causes the internal write enable latch to be set. a flag bit in the status register, called wel, indicates the state of t he latch. wel = ?1? indicates that writes are permitted. attempting to write the wel bit in the status register has no effect on the state of this bit - only the wren opcode can set this bit. the wel bit will be aut omatically cleared on the rising edge of cs following a wrdi, a wrsr, or a write operation. this prevents further writes to t he status register or the f-ram array without another wren command. figure 7 illustrates the wren command bus configuration. wrdi - reset write enable latch the wrdi command disables all write activity by clearing the write enable latch. the user can verify that writes are disabled by reading the wel bit in the status register and verifying that wel is equal to ?0?. figure 8 illustrates the wrdi command bus configuration. figure 5. spi mode 0 figure 6. spi mode 3 table 1. opcode commands name description opcode wren set write enable latch 0000 0110b wrdi reset write enable latch 0000 0100b rdsr read status register 0000 0101b wrsr write status register 0000 0001b read read memory data 0000 0011b fstrd fast read memory data 0000 1011b write write memory data 0000 0010b sleep enter sleep mode 1011 1001b rdid read device id 1001 1111b reserved reserved 1100 0011b 1100 0010b 0101 1010b 0101 1011b lsb msb 76543210 cs sck si 01 2 3 4 5 67 cs sck si 765432 10 lsb msb 01 2 3 4 5 67 figure 7. wren bus configuration figure 8. wrdi bus configuration 0 0 0 0 0 1 1 0 cs sck si so hi-z 0 1 2 3 4 5 6 7 0 0 0 cs sck si so hi-z 0 1 2 3 4 5 6 7 0 0 00 1
fm25v02a document number: 001-90865 rev. *f page 7 of 23 status register and write protection the write protection featur es of the fm25v02a are multi-tiered and are enabled through the status regist er. the status register is organized as follows (the default value shipped from t he factory for bits in the status register is ?0?): bits 0 and 4-6 are fixed at ?0?; none of these bits can be modified. note that bit 0 ("ready or write in progress? bit in serial flash and eeprom) is unnecessary, as the f-ram writes in real-time and is never busy, so it reads out as a ?0?. an exception to this is when the device is waking up from sleep mode, which is described in sleep mode on page 10 . the bp1 and bp0 control the software write-protection features and are nonvolatile bits. the wel flag indicates the state of the write enable latch. attempting to directly write the wel bit in the status register has no effect on its state. this bit is internally set and cleared via the wren and wrdi commands, respectively. bp1 and bp0 are memory block write protection bits. they specify portions of me mory that are write- protected as shown in ta b l e 4 . the bp1 and bp0 bits and the write enable latch are the only mechanisms that protect the memory from writes. the remaining write protection features protect inadvertent changes to the block protect bits. the write protect enable bit (wpen) in the status register controls the effect of the hardware write protect (wp ) pin. when the wpen bit is set to '0', the status of the wp pin is ignored. when the wpen bit is set to '1', a low on the wp pin inhibits a write to the status register. thus the status register is write-protected only when wpen = '1' and wp = '0'. ta b l e 5 summarizes the write protection conditions. rdsr - read status register the rdsr command allows the bus master to verify the contents of the status register. reading the status register provides information about the current state of the write-protection features. fo llowing the rdsr opcode, the fm25v02a will return one byte with the contents of the status register. wrsr - write status register the wrsr command allows the spi bus master to write into the status register and change th e write protect configuration by setting the wpen, bp0, and bp1 bits as required. prior to issuing a wrsr command, the wp pin must be high or inactive. note that on the fm25v02a, wp only prevents writing to the status register, not the memory array. before sending the wrsr command, the user mu st send a wren command to enable writes. executing a wrsr command is a write operation and therefore, clears t he write enable latch. table 2. status register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 wpen (0) x (0) x (0) x (0) bp1 (0) bp0 (0) wel (0) x (0) table 3. status register bit definition bit definition description bit 0 don?t care this bit is non-writable and always returns ?0? upon read. bit 1 (wel) write enable wel indicates if the device is writ e enabled. this bit defaults to ?0? (disabled) on power-up. wel = '1' --> write enabled wel = '0' --> write disabled bit 2 (bp0) block protect bit ?0? used for block protection. for details, see table 4 on page 7 . bit 3 (bp1) block protect bit ?1? used for block protection. for details, see table 4 on page 7 . bit 4-6 don?t care these bits are non-writable and always return ?0? upon read. bit 7 (wpen) write protect enable bit used to ena ble the function of write protect pin (wp ). for details, see table 5 on page 7 . table 4. block memory write protection bp1 bp0 protected address range 0 0 none 0 1 6000h to 7fffh (upper 1/4) 1 0 4000h to 7fffh (upper 1/2) 1 1 0000h to 7fffh (all) table 5. write protection wel wpen wp protected blocks unprotected blocks status register 0 x x protected protected protected 1 0 x protected unprotected unprotected 1 1 0 protected unprotected protected 1 1 1 protected unprotected unprotected
fm25v02a document number: 001-90865 rev. *f page 8 of 23 memory operation the spi interface, which is capable of a high clock frequency, highlights the fast write capability of the f-ram technology. unlike serial flash and eeproms, the fm25v02a can perform sequential writes at bus speed. no page register is needed and any number of sequential wr ites may be performed. write operation all writes to the memory begin with a wren opcode with cs being asserted and deasserted. the next opcode is write. the write opcode is followed by a two-byte address containing the 15-bit address (a14-a0) of the fi rst data byte to be written into the memory. the upper bit of t he two-byte address is ignored. subsequent bytes are data bytes, which are written sequentially. addresses are incremented internally as long as the bus master continues to issue clocks and keeps cs low. if the last address of 7fffh is reached, the counter will roll over to 0000h. data is written msb first. the rising edge of cs terminates a write operation. a write operation is shown in figure 11 . note when a burst write reaches a protected block address, the automatic address increment stops and all the subsequent data bytes received for write will be ignored by the device. eeproms use page buffers to in crease their write throughput. this compensates for the technology's inherently slow write operations. f-ram memories do not have page buffers because each byte is written to the f-ram array immediately after it is clocked in (after the eighth clock). this allows any number of bytes to be written without page buffer delays. note if the power is lost in the mi ddle of the write operation, only the last completed byte will be written. read operation after the falling edge of cs , the bus master can issue a read opcode. following the read command is a two-byte address containing the 15-bit address (a14-a0) of the first byte of the read operation. the upper bit of the address is ignored. after the opcode and address are issued, the device drives out the read data on the next eigh t clocks. the si input is ignored during read data bytes. subsequent bytes are data bytes, which are read out sequentially. addresses are incremented internally as long as the bus master continues to issue clocks and cs is low. if the last address of 7fffh is reach ed, the counter will roll over to 0000h. data is read msb first. the rising edge of cs terminates a read operation and tristates the so pin. a read operation is shown in figure 12 . fast read operation the fm25v02a supports a fast read opcode (0bh) that is provided for code compatibility with serial flash devices. the fast read opcode is followed by a two-byte address containing the 15-bit address (a14-a0) of the first byte of the read operation and then a dummy byte. the dummy byte inserts a read latency of an 8-clock cycl e. the fast r ead operation is otherwise the same as an ordinary read operation except that it figure 9. rdsr bus configuration figure 10. wrsr bus configuration (wren not shown) cs sck so 01234567 si 000001 0 0 1 hi-z 012345 67 lsb d0 d1 d2 d3 d4 d5 d6 msb d7 opcode data cs sck so 0123 4567 si 00 00000 1 msb lsb d2 d3 d7 hi-z 012345 67 opcode data x x x x x
fm25v02a document number: 001-90865 rev. *f page 9 of 23 requires an additional dummy byte. after receiving the opcode, address, and a dummy byte, the fm25v02a starts driving its so line with data bytes, with the ms b first, and continues trans- mitting as long as the device is selected and the clock is available. in case of bulk read, the internal address counter is incremented automatically, and af ter the last address 7fffh is reached, the counter rolls over to 0000h. when the device is driving data on its so line, any transition on its si line is ignored. the rising edge of cs terminates a fast read operation and tristates the so pin. a fast read operation is shown in figure 13 . figure 11. memory write (wren not shown) operation figure 12. memory read operation figure 13. fast read operation ~ ~ cs sck so 01234 5 6 70 7 6 5 4 3 2 1 1213141501234567 msb lsb data d0 d1 d2 d3 d4 d5 d6 d7 si opcode 0000001 x a14 a13 a12 a11 a9 0 a10 a8 a3 a1 a2 a0 15-bit address msb lsb hi-z ~ ~ cs sck so 01 23456 70 7 6 5 4 3 2 1 12131415012345 6 7 msb lsb data si opcode 0000001 x a14 a13 a12 a11 a9 1 a10 a8 a3 a1 a2 a0 15-bit address msb lsb d0 d1 d2 d3 d4 d5 d6 d7 hi-z ~ ~ cs sck so 012345670 7 6 5 4 3 2 1 121314151617181920 212223 data si opcode 0000101 x a14 a13 a11 a9 1 a10 a8 a3 a1 a2 a0 15-bit address msb lsb msb lsb d0 d1 d2 d3 d4 d5 d6 d7 012345 67 x x x x x x x x dummy byte hi-z a12
fm25v02a document number: 001-90865 rev. *f page 10 of 23 hold pin operation the hold pin can be used to interrupt a serial operation without aborting it. if the bus master pulls the hold pin low while sck is low, the current operati on will pause. taking the hold pin high while sck is low will resume an operation. the transitions of hold must occur while sck is low, but the sck and cs pin can toggle during a hold state. sleep mode a low-power sleep mode is implemented on the fm25v02a device. the device will enter the low-power state when the sleep opcode b9h is clocked- in and a rising edge of cs is applied. when in sleep mode, the sck and si pins are ignored and so will be hi-z, but the device continues to monitor the cs pin. on the next falling edge of cs , the device will return to normal operation within t rec time. the so pin remains in a hi-z state during the wakeup period. the device does not necessarily respond to an opcode within the wakeup period. to start the wakeup procedure, the controller may send a ?dummy? read, for example, and wait the remaining t rec time. figure 14. hold operation [2] cs sck hold so ~ ~ ~ ~ si valid in valid in figure 15. sleep mode operation cs sck si so hi-z 0 enters sleep mode valid in t su t rec recovers from sleep mode 10111 00 1 1 2 3 4 5 6 7 2. figure 14 shows the hold operation for input mode and output mode.
fm25v02a document number: 001-90865 rev. *f page 11 of 23 device id the fm25v02a device can be interrogated for its manufacturer, product identification, and die revision. the rdid opcode 9fh allows the user to read the manu facturer id and product id, both of which are read-only bytes. the jedec-assigned manufacturer id places the cypress (ramtron) identifier in bank 7; therefore, there are six bytes of the continuation code 7fh followed by the single byte c2h. there are two bytes of product id, which includes a family code , a density code, a sub code, and the product revision code. table 6. device id device id (9 bytes) device id description 71?16 (56 bits) 15?13 (3 bits) 12?8 (5 bits) 7?6 (2 bits) 5?3 (3 bits) 2?0 (3 bits) manufacturer id product id family density sub rev rsvd 7f7f7f7f7f7fc22208h 0111111101111111011111110111 1111011111110111111111 000010 001 00010 00 001 000 figure 16. read device id cs sck so si opcode ~ ~ 01 2 3 456 70 7 6 5 4 3 2 1 444546 5556575859606162636465666768697071 10011111 lsb msb hi-z 47 48 49 50 51 52 53 54 9-byte device id d7 d6 d5 d4 d3 d2 d1 d0 d3 d1 d7 d2 d0 d5 d3 d1 d4 d2 d7 d5 d3 d6 d4 d6 d0 d1 d7 d5 d0 d6 d3 d1 d2 d0 d2 d4
fm25v02a document number: 001-90865 rev. *f page 12 of 23 endurance the fm25v02a devices are capable of being accessed at least 10 14 times, reads or writes. an f-ram memory operates with a read and restore mechanism. therefore, an endurance cycle is applied on a row basis for each access (read or write) to the memory array. the f-ram architecture is based on an array of rows and columns of 4k rows of 64-bits each. the entire row is internally accessed once whether a single byte or all eight bytes are read or written. each byte in the row is counted only once in an endurance calculation. ta b l e 7 shows endurance calculations for a 64-byte repeating loop, which includes an opcode, a starting address, and a sequential 64-byte data stream. this causes each byte to experience one en durance cycle through the loop. table 7. time to reach endurance limit for repeating 64-byte loop sck freq (mhz) endurance cycles/sec endurance cycles/year years to reach limit 40 74,620 2.35 10 12 42.6 20 37,310 1.18 10 12 85.1 10 18,660 5.88 10 11 170.2 5 9,330 2.94 10 11 340.3
fm25v02a document number: 001-90865 rev. *f page 13 of 23 maximum ratings exceeding maximum ratings may shorten the useful life of the device. these user guidelines are not tested. storage temperature ............................... ?55 ? c to + 125 ? c maximum accumulated storage time at 125 c ambient temperature ................................. 1000 h at 85 c ambient temperature ................................ 10 years ambient temperature with power applied ..... ............... ............... ?55 c to +125 c supply voltage on v dd relative to v ss ........?1.0 v to + 4.5 v input voltage ........... ?1.0 v to +4.5 v and v in < v dd + 1.0 v dc voltage applied to outputs in hi-z state ........................................ ?0.5 v to v dd + 0.5 v transient voltage (< 20 ns) on any pin to ground potential ............ ..... ?2.0 v to v dd + 2.0 v package power dissipation capability (t a = 25 c) ................................................. 1.0 w surface mount lead soldering temperature (3 seconds) ........ .............. .............. .... + 260 ? c dc output current (1 output at a time, 1s duration) .... 15 ma electrostatic discharge voltage human body model (jedec std jesd22-a114-b) ................ 2 kv charged device model (jedec std jesd22-c101-a) ........... 500 v latch-up current .................................................... > 140 ma operating range range ambient temperature (t a ) v dd industrial ?40 ? c to +85 ? c 2.0 v to 3.6 v dc electrical characteristics over the operating range parameter description test conditions min typ [3] max unit v dd power supply 2.0 3.3 3.6 v i dd v dd supply current sck toggling between v dd ? 0.2 v and v ss , other inputs v ss or v dd ? 0.2 v. so = open. f sck = 40 mhz ? ? 2.5 ma f sck = 1 mhz ? ? 0.22 ma i sb v dd standby current cs = v dd . all other inputs v ss or v dd . ? 90 150 ? a i zz sleep mode current cs = v dd . all other inputs v ss or v dd .?58 ? a i li input leakage current (except hold ) v ss < v in < v dd ?1 ? +1 ? a input leakage current (for hold ) ?100 ? +1 ? a i lo output leakage current v ss < v out < v dd ?1 ? +1 ? a v ih input high voltage 0.7 v dd ?v dd + 0.3 v v il input low voltage ? 0.3 ? 0.3 v dd v v oh1 output high voltage i oh = ?1 ma, v dd = 2.7 v. 2.4 ? ? v v oh2 output high voltage i oh = ?100 ? av dd ? 0.2 ? ? v v ol1 output low voltage i ol = 2 ma, v dd = 2.7 v ? ? 0.4 v v ol2 output low voltage i ol = 150 ? a??0.2v r in [4] input resistance (hold )for v in = v il (max) 800 ? ? k ? for v in = v ih (min) 30 ? ? k ? notes 3. typical values are at 25 c, v dd = v dd (typ). not 100% tested. 4. the input pull-up circuit is strong (30 k ? ) when the input voltage is above v ih and weak (800 k ? ) when the input voltage is below v il .
fm25v02a document number: 001-90865 rev. *f page 14 of 23 ac test conditions input pulse levels .................................10% and 90% of v dd input rise and fall times ...................................................3 ns input and output timing reference levels ................0.5 v dd output load capacitance .............................................. 30 pf data retention and endurance parameter description test condition min max unit t dr data retention t a = 85 ? c 10 ? years t a = 75 ? c38? t a = 65 ? c151? nv c endurance over operating temperature 10 14 ? cycles capacitance parameter [5] description test conditions max unit c o output pin capacitance (so) t a = 25 ? c, f = 1 mhz, v dd = v dd (typ) 8 pf c i input pin capacitance 6 pf thermal resistance parameter description test conditions 8-pin soic 8-pin dfn unit ? ja thermal resistance (junction to ambient) test conditions follow standard test methods and procedures for measuring thermal impedance, per eia/ jesd51. 146 31 ? c/w ? jc thermal resistance (junction to case) 48 35 ? c/w note 5. this parameter is periodically sampled and not 100% tested.
fm25v02a document number: 001-90865 rev. *f page 15 of 23 ac switching characteristics over the operating range parameters [6] description v dd = 2.0 v to 3.6 v v dd = 2.7 v to 3.6 v unit cypress parameter alt. parameter min max min max f sck ? sck clock frequency 0 25 0 40 mhz t ch ? clock high time 18 ? 11 ? ns t cl ? clock low time 18 ? 11 ? ns t csu t css chip select setup 12 ? 10 ? ns t csh t csh chip select hold 12 ? 10 ? ns t od [7, 8] t hzcs output disable time ? 20 ? 12 ns t odv t co output data valid time ? 16 ? 9 ns t oh ? output hold time 0 ? 0 ? ns t d ? deselect time 60 ? 40 ? ns t r [9, 10] ? data in rise time ? 50 ? 50 ns t f [9, 10] ? data in fall time ? 50 ? 50 ns t su t sd data setup time 8 ? 5 ? ns t h t hd data hold time 8 ? 5 ? ns t hs t sh hold setup time 12 ? 10 ? ns t hh t hh hold hold time 12 ? 10 ? ns t hz [7, 8] t hhz hold low to hi-z ? 25 ? 20 ns t lz [8] t hlz hold high to data active ? 25 ? 20 ns notes 6. test conditions assume a signal transition time of 3 ns or less, timing reference levels of 0.5 v dd , input pulse levels of 10% to 90% of v dd , output loading of the specified i ol /i oh and 30 pf load capacitance shown in ac test conditions . 7. t od and t hz are specified with a load capacitance of 5 pf. transition is measured when the outputs enter a high impedance state. 8. characterized but not 100% tested in production. 9. rise and fall times measured between 10% and 90% of waveform. 10. these parameters are guaranteed by design and are not tested.
fm25v02a document number: 001-90865 rev. *f page 16 of 23 figure 17. synchronous data timing (mode 0) figure 18. hold timing hi-z valid in hi-z cs sck si so t cl t ch t csu t su t h t odv t oh t d t csh t od valid in valid in cs sck hold so t hs t hz t lz t hh t hs t hh ~ ~ ~ ~ si t su valid in valid in
fm25v02a document number: 001-90865 rev. *f page 17 of 23 power cycle timing over the operating range parameter description min max unit t pu power-up v dd (min) to first access (cs low) 1 ? ms t pd last access (cs high) to power-down (v dd (min)) 0 ? s t vr [11, 12] v dd power-up ramp rate 50 ? s/v t vf [11, 12] v dd power-down ramp rate 100 ? s/v t rec [13] recovery time from sleep mode ? 400 s figure 19. power cycle timing cs ~ ~ ~ ~ t pu t vr t vf v dd v dd(min) t pd v dd(min) notes 11. slope measured at any point on v dd waveform. 12. these parameters are guaranteed by design and are not tested. 13. refer to figure 15 on page 10 for sleep mode recovery timing.
fm25v02a document number: 001-90865 rev. *f page 18 of 23 ordering code definitions ordering information ordering code package diagram package type operating range fm25v02a-g 51-85066 8-pin soic industrial fm25v02a-gtr 51-85066 8-pin soic fm25v02a-dg 001-85260 8-pin dfn FM25V02A-DGTR 001-85260 8-pin dfn all these parts are pb-free. contact your local cypre ss sales representative for availability of these parts. option: blank = standard; tr = tape and reel package type: x = g or dg g = 8-pin soic; dg = 8-pin dfn device revision: a density: 02 = 256-kbit voltage: v = 2.0 v to 3.6 v spi f-ram cypress 25 fm v 02 -x tr a
fm25v02a document number: 001-90865 rev. *f page 19 of 23 package diagrams figure 20. 8-pin soic (150 mils) package outline, 51-85066 51-85066 *h
fm25v02a document number: 001-90865 rev. *f page 20 of 23 figure 21. 8-pin dfn (4.0 mm 4.5 mm 0.8 mm) package outline, 001-85260 package diagrams (continued) 001-85260 *b
fm25v02a document number: 001-90865 rev. *f page 21 of 23 acronyms document conventions units of measure acronym description cpha clock phase cpol clock polarity dfn dual flat no-lead eeprom electrically erasable programmable read-only memory eia electronic industries alliance f-ram ferroelectric random access memory i/o input/output jedec joint electron devices engineering council jesd jedec standards lsb least significant bit msb most significant bit rohs restriction of hazardous substances spi serial peripheral interface soic small outline integrated circuit symbol unit of measure c degree celsius hz hertz khz kilohertz k ? kilohm kbit kilobit mhz megahertz ? a microampere ? f microfarad ? s microsecond ma milliampere ms millisecond ns nanosecond ? ohm % percent pf picofarad v volt w watt
fm25v02a document number: 001-90865 rev. *f page 22 of 23 document history page document title: fm25v02a, 256-kb it (32k 8) serial (spi) f-ram document number: 001-90865 rev. ecn no. orig. of change submission date description of change ** 4265427 gvch 01/29/2014 new data sheet. *a 4390913 gvch 06/20/2014 changed status from advance to preliminary. updated pin definitions : updated details in ?description? column of ?hold ? pin (added the sentence, ?this pin has a weak internal pull-up (refer to the r in spec in dc electrical characteristics )?). updated maximum ratings : removed ?machine model? under ?ele ctrostatic discharge voltage?. updated dc electrical characteristics : added typical value for i sb and i zz parameters. changed minimum value of r in parameter from 40 k ?? to 30 k ?? corresponding to test condition ?v in = v ih (min)?. changed minimum value of r in parameter from 1 m ?? to 800 k ?? corresponding to test condition ?v in = v il (max)?. updated note 4. updated thermal resistance : added thermal resistance values. *b 4571858 gvch 11/18/2014 updated serial peripheral interface - spi bus : updated command structure : updated table 1 : added reserved opcodes - 0xc3, 0xc2, 0x5a, 0x5b. *c 4197512 zsk 02/10/2015 changed status from preliminary to final. replaced ?tdfn? with ?dfn? in all instances across the document. updated functional description : added ?for a complete list of related resources, click here .? at the end. updated pin definitions : updated details in ?description? column of ?exposed pad? pin. updated package diagrams : spec 51-85066 ? changed revision from *f to *g. *d 4784430 gvch 06/02/2015 updated package diagrams : spec 001-85260 ? changed revision from *a to *b. updated to new template. *e 4879715 zsk / psr 08/11/2015 updated maximum ratings : removed ?maximum junction temperature?. added ?maximum accumulated storage time?. added ?ambient temperature with power applied?. *f 5085935 gvch 01/14/2016 updated ordering information : updated part numbers. updated package diagrams : spec 51-85066 ? changed revision from *g to *h.
document number: 001-90865 rev. *f revised january 14, 2016 page 23 of 23 all products and company names mentioned in this document may be the trademarks of their respective holders. fm25v02a ? cypress semiconductor corporation, 2014-2016. the information contained herein is subject to change without notice. cypress s emiconductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress product. nor does it convey or imply any license under patent or other rights. cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement wi th cypress. furthermore, cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. any source code (software and/or firmware) is owned by cypress semiconductor corporation (cypress) and is protected by and subj ect to worldwide patent protection (united states and foreign), united states copyright laws and internatio nal treaty provisions. cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the cypress source code and derivative works for the sole purpose of creating custom software and or firmware in su pport of licensee product to be used only in conjunction with a cypress integrated circuit as specified in the applicable agreement. any reproduction, modification, translation, compilation, or repre sentation of this source code except as specified above is prohibited without the express written permission of cypress. disclaimer: cypress makes no warranty of any kind, express or implied, with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. cypress reserves the right to make changes without further notice to t he materials described herein. cypress does not assume any liability arising out of the application or use of any product or circuit described herein. cypress does not authori ze its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress? prod uct in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. use may be limited by and subject to the applicable cypress software license agreement. sales, solutions, and legal information worldwide sales and design support cypress maintains a worldwide network of offices, solution center s, manufacturer?s representatives, and distributors. to find t he office closest to you, visit us at cypress locations . products automotive cypress.co m/go/automotive clocks & buffers cypress.com/go/clocks interface cypress. com/go/interface lighting & power control cypress.com/go/powerpsoc memory cypress.com/go/memory psoc cypress.com/go/psoc touch sensing cyp ress.com/go/touch usb controllers cypress.com/go/usb wireless/rf cypress.com/go/wireless psoc ? solutions psoc.cypress.com/solutions psoc 1 | psoc 3 | psoc 4 | psoc 5lp cypress developer community community | forums | blogs | video | training technical support cypress.com/go/support

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