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fm16w08 64-kbit (8 k 8) wide voltage bytewide f-ram memory cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document number: 001-86210 rev. *c revised march 10, 2014 2-mbit (128 k 16) f-ram memory features 64-kbit ferroelectric random access memory (f-ram) logically organized as 8 k 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 sram and eeprom compatible ? industry-standard 8 k 8 sram and eeprom pinout ? 70-ns access time, 130-ns cycle time superior to battery-backed sram modules ? no battery concerns ? monolithic reliability ? true surface mount solution, no rework steps ? superior for moisture, shock, and vibration ? resistant to negative voltage undershoots low power consumption ? active current 12 ma (max) ? standby current 20 ? a (typ) wide voltage operation: v dd = 2.7 v to 5.5 v industrial temperature: ?40 ? c to +85 ? c 28-pin small outline integrated circuit (soic) package restriction of hazardous substances (rohs) compliant functional overview the fm16w08 is a 8 k 8 nonvolatile memory that reads and writes similar to a standard sram. a ferroelectric random access memory or f-ram is nonvolatile, which means that data is retained after power is removed. it provides data retention for over 151 years while eliminating the reliability concerns, functional disadvantages, and system design complexities of battery-backed sram (bbsram). fast write timing and high write endurance make the f-ram superior to other types of memory. the fm16w08 operation is simila r to that of other ram devices and therefore, it can be used as a drop-in replacement for a standard sram in a system. minimu m read and write cycle times are equal. the f-ram memory is nonvolatile due to its unique ferroelectric memory process. these features make the fm16w08 ideal for nonvolatile memory applications requiring frequent or rapid writes. the device is available in a 28-pin soic surface mount package. device specifications are guaranteed over the industrial temperature range ?40 c to +85 c. logic block diagram address latch and decoder ce control logic we a i/o latch & bus driver oe dq 8 k x 8 f-ram array 12-0 7-0 a 12-0
fm16w08 document number: 001-86210 rev. *c page 2 of 18 contents pinout ................................................................................ 3 pin definitions .................................................................. 3 device operation .............................................................. 4 memory architecture ............... .................................... 4 memory operation....................................................... 4 read operation ........................................................... 4 write operation ........................................................... 4 pre-charge operation.................................................. 4 endurance ......................................................................... 4 f-ram design considerations........................................ 5 maximum ratings............................................................. 7 operating range............................................................... 7 dc electrical characteristics .......................................... 7 data retention and endurance ....................................... 7 capacitance ...................................................................... 8 thermal resistance.......................................................... 8 ac test conditions .......................................................... 8 ac switching characteristics ......................................... 9 sram read cycle ...................................................... 9 sram write cycle..................................................... 10 power cycle timing ....................................................... 12 functional truth table................................................... 13 ordering information...................................................... 14 ordering code definitions ...... ................................... 14 package diagram............................................................ 15 acronyms ........................................................................ 16 document conventions ................................................. 16 units of measure ....................................................... 16 document history page ................................................. 17 sales, solutions, and legal information ...................... 18 worldwide sales and design supp ort............. .......... 18 products .................................................................... 18 psoc? solutions ...................................................... 18 cypress developer community................................. 18 technical support .................. ................................... 18
fm16w08 document number: 001-86210 rev. *c page 3 of 18 pinout figure 1. 28-pin soic pinout pin definitions pin name i/o type description a 12 ?a 0 input address inputs : the 13 address lines select one of 8,192 bytes in the f-ram array. dq 7 ?dq 0 input/output data i/o lines : 8-bit bidirectional data bus for accessing the f-ram array. we input write enable : a write cycle begins when we is asserted. asserting we low causes the fm16w08 to write the contents of the data bus to the address location latched by the falling edge of ce . ce input chip enable : the device is selected when ce is low. asserting ce low causes the address to be latched internally. address changes that occur after ce goes low will be ignored until the next falling edge occurs. oe input output enable : when oe is low, the fm16w08 drives the data bus when the valid read data is available. deasserting oe high tristates the dq pins. v ss ground ground for the device. must be connected to the ground of the system. v dd power supply power supply input to the device. nc no connect no connect. this pin is not connected to the die. dq 4 dq 5 dq 6 dq 7 oe a 8 nc we a 9 a 10 a 11 v dd ce dq 3 nc a 3 a 2 a 1 a 0 dq 0 dq 1 dq 2 v ss a 12 a 7 a 6 a 5 a 4 28-pin soic (x 8) top view (not to scale) 1 2 3 4 13 14 5 6 7 8 9 10 11 12 16 15 19 18 17 21 20 24 23 22 26 25 28 27
fm16w08 document number: 001-86210 rev. *c page 4 of 18 device operation the fm16w08 is a bytewide f-ram memory logically organized as 8,192 8 and accessed using an industry-standard parallel interface. all data written to the part is immediately nonvolatile with no delay. functional operation of the f-ram memory is the same as sram type devices, except the fm16w08 requires a falling edge of ce to start each memory cycle. see the functional truth table on page 13 for a complete description of read and write modes. memory architecture users access 8,192 memory loca tions, each with 8 data bits through a parallel interface. the complete 13-bit address specifies each of the 8,192 bytes uniquely. the f-ram array is organized as 1024 rows of 8-bytes each. this row segmentation has no effect on operation, however the user can group data into blocks by its endurance characte ristics as explained in the endurance section. the cycle time is the same for read and write memory operations. this simplifies memory controller logic and timing circuits. likewise the access time is the same for read and write memory operations. when ce is deasserted high, a pre-charge operation begins, and is requir ed of every memory cycle. thus unlike sram, the access and cycle times are not equal. writes occur immediately at the end of the access with no delay. unlike an eeprom, it is not necessary to poll the device for a ready condition since writes occur at bus speed. it is the user?s responsibility to ensure that v dd remains within datasheet tolerances to prevent incorrect operation. also proper voltage level and timing relationships between v dd and ce must be maintained during power-up and power-down events. see ?power cycle timing? on page 12. memory operation the fm16w08 is designed to operate in a manner similar to other bytewide memory products. for users familiar with bbsram, the performance is comparable but the bytewide interface operates in a slightly different manner as described below. for users familiar with eeprom, the differences result from the higher write performance of f-ram technology including nodelay writes and much higher write endurance. read operation a read operation begins on the falling edge of ce . at this time, the address bits are latched and a memory cycle is initiated. once started, a full memory cycl e must be completed internally even if ce goes inactive. data becomes available on the bus after the access time is met. after the address has been latched, the address value may be changed upon satisfying the hold time parameter. unlike an sram, changing address values will have no effect on the memory operation after the address is latched. the fm16w08 will drive the data bus when oe is asserted low and the memory access time is met. if oe is asserted after the memory access time is met, the data bus will be driven with valid data. if oe is asserted before completing the memory access, the data bus will not be driven until valid data is available. this feature minimizes supply current in the system by eliminating transients caused by invalid data being driven to the bus. when oe is deasserted high, the data bus will remain in a hi-z state. write operation in the fm16w08, writes occur in the same interval as reads. the fm16w08 supports both ce and we controlled write cycles. in both cases, the address is latched on the falling edge of ce . in a ce -controlled write, the we signal is asserted before beginning the memory cycle. that is, we is low when the device is activated with the chip enable. in this case, the device begins the memory cycle as a wr ite. the fm16w08 will not drive the data bus regardless of the state of oe . in a we -controlled write, the memory cycle begins on the falling edge of ce . the we signal falls after the falling edge of ce . therefore, the memory cycle begins as a read. the data bus will be driven according to the state of oe until we falls. the ce and we controlled write timing cases are shown in the page 12 . write access to the array begins asynchronously after the memory cycle is initiated. the write access terminates on the rising edge of we or ce , whichever comes first. a valid write operation requires the user to m eet the access time specification before deasserting we or ce . the data setup time indicates the interval during which data cannot change before the end of the write access. unlike other nonvolatile memory te chnologies, there is no write delay with f-ram. because the read and write access times of the underlying memory are the same, the user experiences no delay through the bus. the entire memory operation occurs in a single bus cycle. therefore, any op eration including read or write can occur immediately following a write. data polling, a technique used with eeproms to determi ne if a write is complete, is unnecessary. pre-charge operation the pre-charge operation is an in ternal condition in which the memory state is prepared for a new access. all memory cycles consist of a memory access and a pre-charge. pre-charge is user-initiated by driving the ce signal high. it must remain high for at least the minimum pre-charge time, t pc . the user determines the beginning of this operation since a pre-charge will not begin until ce rises. however, the device has a maximum ce low time specification that must be satisfied. endurance internally, a f-ram operates with a read and restore mechanism. therefore, each read and write cycle involves a change of state. the memory arch itecture is based on an array of rows and columns. each re ad or write access causes an endurance cycle for an entire row. in the fm16w08, a row is 64 bits wide. every 8-byte boundar y marks the beginning of a new row. endurance can be optimized by ensuring frequently accessed data is located in different rows. regardless, f-ram
fm16w08 document number: 001-86210 rev. *c page 5 of 18 offers substantially higher writ e endurance than other nonvolatile memories. the rated endurance limit of 10 14 cycles will allow 150,000 accesses per second to the same row for over 20 years. f-ram design c onsiderations when designing with f-ram for the first time, users of sram will recognize a few minor differences. first, bytewide f-ram memories latch each address on the falling edge of chip enable. this allows the address bus to change after starting the memory access. since every access latches the memory address on the falling edge of ce , users cannot ground it as they might with sram. users who are modifying existing designs to use f-ram should examine the memory controller for timing compatibility of address and control pins. ea ch memory access must be qualified with a low transition of ce . in many cases, this is the only change required. an example of the signal relationships is shown in figure 2 below. also shown is a common sram signal relationship that will not work for the fm16w08. the reason for ce to strobe for each address is twofold: it latches the new address and creates the necessary pre-charge period while ce is high. a second design consideration relates to the level of v dd during operation. battery-backed srams are forced to monitor v dd in order to switch to battery backup. they typically block user access below a certain v dd level in order to prevent loading the battery with current demand from an active sram. the user can be abruptly cut off from access to the nonvolatile memory in a power down situation with no warning or indication. f-ram memories do not need this system overhead. the memory will not block access at any v dd level that complies with the specified operating range. th e user should take measures to prevent the processor from accessing memory when v dd is out-of-tolerance. the common design practice of holding a processor in reset during power-down may be sufficient. it is recommended that chip enable is pulled high and allowed to track v dd during power-up and powe r-down cycles. it is the user?s responsibility to ensure that chip enable is high to prevent accesses below v dd min. (2.7 v). figure 3 shows a pull-up resistor on ce , which will keep the pin high during power cycles, assuming the mcu / mpu pin tristates during the reset condition. the pull-up resistor value should be chosen to ensure the ce pin tracks v dd to a high enough value, so that the current drawn when ce is low is not an issue. figure 2. chip enable and memory address relationships valid strobing of ce f-ram signaling ce address a1 a2 data d1 d2 invalid strobing of ce sram signaling ce address a1 a2 data d1 d2 figure 3. use of pull-up resistor on ce mcu / mpu ce we oe a 12-0 dq 7-0 fm16w08 v dd
fm16w08 document number: 001-86210 rev. *c page 6 of 18 note that if ce is tied to ground, the user must be sure we is not low at power-up or power-down events. if the chip is enabled and we is low during power cycles, data will be corrupted. figure 4 shows a pull-up resistor on we , which will keep the pin high during power cycles, assuming the mcu / mpu pin tristates during the reset condition. the pull-up resistor value should be chosen to ensure the we pin tracks v dd to a high enough value, so that the current drawn when we is low is not an issue. figure 4. use of pull-up resistor on we mcu / mpu ce we oe a 12-0 dq 7-0 fm16w08 v dd
fm16w08 document number: 001-86210 rev. *c page 7 of 18 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 junction temperature ................................... 95 ? c supply voltage on v dd relative to v ss ........?1.0 v to + 7.0 v voltage applied to outputs in high z state .................................... ?0.5 v to v dd + 0.5 v input voltage .......... ?1.0 v to + 7.0 v and v in < v dd + 1.0 v transient voltage (< 20 ns) on any pin to ground potential ............ ..... ?2.0 v to v cc + 2.0 v package power dissipation capability (t a = 25 c) ................................................. 1.0 w surface mount pb soldering temperature (3 seconds) ........ .............. .............. ..... +260 ? c dc output current (1 output at a time, 1s duration) .... 15 ma static discharge voltage human body model (aec-q100- 002 rev. e) ............ 4 kv charged device model (aec-q100-011 rev. b) .. 1.25 kv machine model (aec-q100-003 re v. e) ................. 300 v latch-up current ................................................... > 140 ma operating range range ambient temperature (t a ) v dd industrial ?40 ? c to +85 ? c 2.7 v to 5.5 v dc electrical characteristics over the operating range parameter description test conditions min typ [1] max unit v dd power supply voltage 2.7 3.3 5.5 v i dd v dd supply current v dd = 5.5 v, ce cycling at min. cycle time. all inputs toggling at cmos levels (0.2 v or v dd ? 0.2 v), all dq pins unloaded. ??12ma i sb standby current v dd = 5.5 v, ce at v ih , all other pins are static and at cmos levels (0.2 v or v dd ? 0.2 v) ?2050a i li input leakage current v in between v dd and v ss ??+ 1a i lo output leakage current v out between v dd and v ss ??+ 1a 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 = ?1.0 ma, v dd > 2.7 v 2.4 ? ? v v oh2 output high voltage i oh = ?100 a v 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 ? ? 0.2 v data retention and endurance parameter description test condition min max unit t dr data retention at +85 ? c 10 ? years at +75 ? c38? at +65 ? c151? nv c endurance over operating temperature 10 14 ? cycles note 1. typical values are at 25 c, v dd = v dd (typ). not 100% tested.
fm16w08 document number: 001-86210 rev. *c page 8 of 18 ac test conditions input pulse levels .................................10% and 90% of v dd input rise and fall times (10%?90%) ........................... < 5 ns input and output timing reference levels ................... 0.5 v dd output load capacitance ............................................. 100 pf capacitance parameter description test conditions max unit c i/o input/output capacitance (dq) t a = 25 ? c, f = 1 mhz, v dd = v dd (typ) 8 pf c in input capacitance 6pf thermal resistance parameter description test conditions 28-pin soic unit ? ja thermal resistance (junction to ambient) test conditions follow standard test methods and procedures for measuring thermal impedance, in accordance with eia/jesd51. 58 ? c/w ? jc thermal resistance (junction to case) 26 ? c/w figure 5. ac test loads 5.5 v output c l r1 r2 497 ? 919 ? 100 pf
fm16w08 document number: 001-86210 rev. *c page 9 of 18 ac switching characteristics over the operating range parameters [2] description v dd = 2.7 v to 3.0 v v dd = 3.0 v to 5.5 v unit cypress parameter alt parameter min max min max sram read cycle t ce t ace chip enable access time ? 80 ? 70 ns t ca ? chip enable active time 80 ? 70 ? ns t rc ? read cycle time 145 ? 130 ? ns t pc ? pre-charge time 65 ? 60 ? ns t as t sa address setup time 0? 0? ns t ah t ha address hold time 15 ? 15 ? ns t oe t doe output enable access time ? 15 ? 12 ns t hz [3, 4] t hzce chip enable to output hi-z ? 15 ? 15 ns t ohz [3, 4] t hzoe output enable high to output hi-z ? 15 ? 15 ns notes 2. test conditions assume a signal transition time of 5 ns or less, timing reference levels of 0.5 v dd , input pulse levels of 10% and 90% of v dd , output loading of the specified i ol /i oh and load capacitance shown in ac test conditions on page 8 . 3. t hz and t ohz are specified with a load capacitance of 5 pf. transition is measured when the outputs enter a high impedance state. 4. this parameter is characterized but not 100% tested.
fm16w08 document number: 001-86210 rev. *c page 10 of 18 sram write cycle t wc t wc write cycle time 145 ? 130 ? ns t ca ? chip enable active time 80 ? 70 ? ns t cw t sce chip enable to write enable high 80 ? 70 ? ns t pc ? pre-charge time 65 ? 60 ? ns t wp t pwe write enable pulse width 50 ? 40 ? ns t as t sa address setup time 0?0? ns t ah t ha address hold time 15 ? 15 ? ns t ds t sd data input setup time 40 ? 30 ? ns t dh t hd data input hold time 0?0? ns t wz [5, 6] t hzwe write enable low to output hi-z ? 15 ? 15 ns t wx [6] ? write enable high to output driven 10 ? 10 ? ns t hz [5] ? chip enable to output hi-z ? 15 ? 15 ns t ws [7] ? write enable to ce low setup time 0 ? 0 ? ns t wh [7] ? write enable to ce high hold time 0 ? 0 ? ns ac switching characteristics (continued) over the operating range parameters [2] description v dd = 2.7 v to 3.0 v v dd = 3.0 v to 5.5 v unit cypress parameter alt parameter min max min max notes 5. t wz and t hz is specified with a load capacitance of 5 pf. transiti on is measured when the outputs enter a high impedance state. 6. this parameter is characterized but not 100% tested. 7. the relationship between ce and we determines if a ce or we controlled write occurs.
fm16w08 document number: 001-86210 rev. *c page 11 of 18 figure 6. read cycle timing 1 figure 7. read cycle timing 2 (ce controlled) t as t ohz ce oe dq t ah t ce t oe t ca t rc t pc t hz 7-0 a 12-0 ce we t as t ah t ca t wc t pc oe t ws t ds t dh t wh a 12-0 dq 7-0
fm16w08 document number: 001-86210 rev. *c page 12 of 18 figure 8. write cycle timing 1 (we controlled) t ws t dh t wh ce we t as t ah t ca t wc t pc oe t ds t wp t wz t wx t c w a 12-0 dq 7-0 (out) dq 7-0 (in) power cycle timing over the operating range parameter description min max unit t pu power-up (after v dd min. is reached) to first access time 10 ? ms t pd last write (we high) to power down time 0 ? s t vr [8] v dd power-up ramp rate 30 ? s/v t vf [8] v dd power-down ramp rate 30 ? s/v figure 9. power cycle timing v dd t vf v dd min min v dd t vr t pu t pd access allowed v il (max) v ih (min) note 8. slope measured at any point on the v dd waveform.
fm16w08 document number: 001-86210 rev. *c page 13 of 18 functional truth table ce we operation [9, 10] h x standby/pre-charge x latch address (and begin write if we = low) l h read l write notes 9. h = logic high, l = logic low, v = valid data, x = don't care, = toggle low, = toggle high. 10. the oe pin controls only the dq output buffers.
fm16w08 document number: 001-86210 rev. *c page 14 of 18 ordering code definitions ordering information ordering code package di- agram package type operating range FM16W08-SG 51-85026 28-pin soic industrial FM16W08-SGtr 51-85026 28-pin soic all the above parts are pb-free. option: blank = standard; tr = tape and reel package type: sg = 28-pin soic i/o width: 8 voltage: 2.7 v to 5.5 v 64-kbit parallel f-ram cypress 16 fm w 08 - sg tr
fm16w08 document number: 001-86210 rev. *c page 15 of 18 package diagram figure 10. 28-pin soic package outline, 51-85026 51-85026 *g
fm16w08 document number: 001-86210 rev. *c page 16 of 18 acronyms document conventions units of measure acronym description cpu central processing unit cmos complementary metal oxide semiconductor jedec joint electron devices engineering council jesd jedec standards eia electronic industries alliance f-ram ferroelectric random access memory i/o input/output mcu microcontroller unit mpu microprocessor unit rohs restriction of hazardous substances r/w read and write soic small outline integrated circuit sram static random access memory symbol unit of measure c degree celsius hz hertz khz kilohertz k ? kilohm mhz megahertz ? a microampere ? f microfarad ? s microsecond ma milliampere ms millisecond m ? megaohm ns nanosecond ? ohm % percent pf picofarad v volt w watt
fm16w08 document number: 001-86210 rev. *c page 17 of 18 document history page document title: fm16w08, 64-kbit (8 k 8) wide voltage bytewide f-ram memory document number: 001-86210 rev. ecn no. orig. of change submission date description of change ** 3912933 gvch 02/25/2013 new spec *a 4000965 gvch 05/15/2013 added appendix a - errata for fm16w08 *b 4045491 gvch 06/30/2013 all errata items are fixed and the errata is removed. *c 4274813 gvch 03/10/2014 converted to cypress standard format changed datasheet status from ?preliminary to final? typo fixed: address fixed from a 14 -a 0 to a 12 -a 0 updated maximum ratings table - removed moisture sensitivity level (msl) - added junction temperature and latch up current updated data retention and endurance table added thermal resistance table removed package marking scheme (top mark)
document number: 001-86210 rev. *c revised march 10, 2014 page 18 of 18 all products and company names mentioned in this document may be the trademarks of their respective holders. fm16w08 ? cypress semiconductor corporation, 2013-2014. 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 representative s, 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 cypress.com/go/plc 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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