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1 m e m o r y all data sheets are subject to change without notice (858) 503-3300 - fax: (858) 503-3301 - www.maxwell.com 128 megabit (16m x 8-bit) 69f1608 ?2008 maxwell technologies all rights reserved. flash memory module 03.07.08 rev 3 f eatures : ? single 5.0 v supply ? organization : - memory cell array: (4m + 128k) bit x 8bit - data register: (512 + 16) bit x 8bit - contains 4 (32 megabit) die automatic program and erase - page program: (512 + 16) byte - block erase: (8k + 256) byte - status register 528-byte page read operation - random access: 10 s (max) - serial page access: 50 ns (min) fast write cycle time - program time: 250 s (typ) - block erase time: 2 ms (typ) command/address/data multiplexed i/o port hardware data protection - program/erase lockout during power transitions reliable cmos floating-gate technology - endurance: 1,000,000 program/erase cycles - data retention: 10 years command register operation d escription : maxwell technologies? 69f1608 high-performance flash mem- ory is a 16m x 8-bit nand flash memory with a spare 128k (131,072) x 8-bit. a program operation programs the 528-byte page in 250 s and an erase operation can be performed in 2 ms on an 8k-byte block. data within a page can be read out at 50 ns cycle time per byte. the on-chip write controller auto- mates all program and erase functions, including pulse repeti- tion, where required, and internal verify and margining of data. even write-intensive systems can take advantage of the 69f1608?s extended reliability of 1,000,000 program/erase cycles by providing either ecc (error correction code) or real time mapping-out algorithm. these algorithms have been implemented in many mass storage applications. the spare 16 bytes of a page combined with the other 512 bytes can be utilized by system-level ecc. the 69f1608 is an optimum solution for large non-volatile storage applications such as solid state data storage, digital voice recorders, digital still cameras and other applications requiring nonvolatility. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shielding in the microcircuit pack- age. capable of surviving in space environments, the 69f1608 is ideal for satellite, spacecraft, and space probe missions. it is available with packaging and screening up to maxwell technologies self-defined class k. logic diagram (1 of 4 die)
2 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 t able 1. p inout d escription p in s ymbol d escription 1v ss ground 2 command latch enable (cle) the cle input controls the path activation for commands sent to the command register. when active high, commands are latched into the command register through the i/o ports on the rising edge of the we signal. 3 address latch enable (ale) the ale input controls the path activation for address and input data to the internal address/data register. addresses are latched on the rising edge or we with ale high, and input data is latched when ale is low. 4 write enable (we ) the we input controls writes to the i/o port. commands, address and data are latched on the rising edge of the we pulse. 5 write protect (wp ) the wp pin provides inadvertent write/erase protection during power transitions. the internal high voltage generator is reset when the wp pin is active low. 6, 7, 18, 19 chip enable inputs ce1 - ce4 the ce input is the device selection control. when ce goes high during a read operation, the device is returned to standby mode. however, when the device is in the busy state during program or erase, ce high is ignored, and does not return the device to standby mode. 8, 9, 10, 11 14, 15, 16, 17 i/o port: i/o0 ~i/o7 the i/o pins are used to input command, address and data, and to output data during read operations. the i/o pins float to high- z when the chip is deselected or when the outputs are disabled. 12 v ss ground 13 v cc q output buffer voltage 20 spare area enable (se ) the se input controls the spare area selection when se is high, the device is deselected the spare area during read1, sequen- tial data input and page program. 21 read/busy (r/b ) the r/b output indicates the status of the device operation. when low, it indicates that a program, erase or random read operation is in process and returns to high state upon comple- tion. it is an open drain output and does not float to high-z condi- tion when the chip is deselected or when outputs are disabled. 22 read enable (re ) the re inputs is the serial data-out control, and when active drives the data onto the i/o bus. data is valid t rea after the falling edge of re which also increments the internal column address counter by one. 23 nc no connection 24 vcc supply voltage
3 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 t able 2. 69f1608 a bsolute m aximum r atings 1,2 p arameter s ymbol m in m ax u nit voltage on any pin relative to v ss v in -0.6 7.0 v operating temperature t bias -40 125 c storage temperature t stg -65 150 c short circuit output current i os -- 5 ma 1. minimum dc voltage is -0.3 v on input/output pins. during transitions, this level may undershoot to -2.0 v for periods < 30 n s. maximum dc voltage on input/output pins is v cc + 0.3 v which, during transitions, may overshoot to v cc + 2.0 v for periods < 20 ns. 2. permanent device damage may occur if absolute maximum ratings are exceeded. functional operation should be restricted to the conditions as detailed in the operational sections of this data sheet. exposure to absolute maximum ratings conditions for extended periods may affect reliability. t able 3. 69f1608 r ecommended o perating c onditions (v cc = 5 v 10%, t a = -40 to 125 c) p arameter s ymbol m in t yp m ax u nit supply voltage v cc 4.5 5.0 5.5 v supply voltage v ss 000v input high voltage v ih 2.4 -- v cc 0.5 v input low voltage v il -0.3 -- 0.8 v t able 4. d elta l imits p aramter c ondition i cc 1 10% i sb 1 10% i sb 2 10% t able 5. 69f1608 ac t est c ondition (v cc = 5 v 10%, t a = -40 to 125 c, unless otherwise noted ) p arameter m in m ax u nit input pulse levels 0.4 2.6 v input rise times -- 5.0 ns input and output timing levels 0.8 2.0 v
4 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 t able 6. 69f1608 dc and o perating c haracteristics (v cc = 5 v 10%, t a = -40 to 125 c, unless otherwise noted ) p arameter s ymbol t est c onditions s ubgroups m in t yp m ax u nit operating current 1 1. only one (1) ce 1-4 active at a time. sequential read i cc1 t cycle = 80 ns cex = v il i out = 0 ma 1, 2, 3 -- 15 30 ma program i cc2 1, 2, 3 -- 15 30 erase i cc3 1, 2, 3 -- 25 40 stand-by-current (ttl) i sb1 ce 1-4 = v ih wp = se = 0v or v cc 1, 2, 3 -- -- 4 ma stand-by current (cmos) i sb2 ce1-4 = v cc - 0.2 wp = se = 0v or v cc 1, 2, 3 -- 40 400 ua input leakage current 2 2. ce1-4 leakage current = +/- 10ua. i li v in = 0 to 5.5 v 1, 2, 3 -40 -- 40 ua output leakage current i lo v out = 0 to 5.5 v 1, 2, 3 -40 -- 40 ua input high voltage, all inputs v ih 1, 2, 3 2.0 -- -- v input low voltage, all inputs v il 1, 2, 3 -- -- 0.8 v output high voltage level v oh i oh = -400 a 1, 2, 3 2.4 -- -- v output low voltage level v ol i ol = 2.1 ma 1, 2, 3 -- -- 0.4 v outuput low current (r/b )i ol (r/b )v ol = 0.4 v 1, 2, 3 8 10 -- ma t able 7. 69f1608 c apacitance 1 1. capacitance guarenteed by design. p arameter s ymbol s ubgroups t est c ondition m in m ax u nit input/output capacitance c i/o 4, 5, 6 v il = 0v -- 40 pf input capacitance (ce1-4 = 10pf) c in 4, 5, 6 v in = 0v -- 40 pf t able 8. 69f1608 m ode s election cle ale ce we re se wp m ode h l l h x x read mode command input l h l h x x address input (3 clock)
5 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 h l l h x h write mode command input l h l h x h address input (3 clock) lll hl/h 1 h data input lllh l/h 1 x sequential read & data output lllhhl/h 1 x during read (busy) xxxxxl/h 1 h during program (busy) xxxxxxhduring erase (busy) xx 2 xxxxlwrite protect xxhxx0v/v cc 3 0v/v cc 3 stand-by 1. when se is high, spare area is deselected. 2. x can be v il or v ih . 3. wp should be biased to cmos high or cmos low for standby. t able 9. 69f1608 p rogram /e rase c haracteristics (v cc = 5 v 10%, t a =-40 to +125c, unless otherwise noted ) p arameter s ymbol m in t yp m ax u nit program time t prog -- 0.25 1.5 ms number of partial program cycles in the same page n op -- -- 10 cycles block erase time t bers -- 2 10 ms t able 8. 69f1608 m ode s election cle ale ce we re se wp m ode
6 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 t able 10. 69f1608 ac t iming c haracteristics for c ommand /a ddress /d ata i nput (v cc = 5 v 10%, t a =-40 to +125 c, unless otherwise noted ) p arameter s ymbol s ubgroups m in m ax u nit cle set-up time t cls 9, 10, 11 0 -- ns cle hold time t clh 9, 10, 11 10 -- ns ce setup time t cs 9, 10, 11 0 -- ns ce hold time t ch 9, 10, 11 10 -- ns we pulse width t wb 9, 10, 11 25 -- ns ale setup time t als 9, 10, 11 0 -- ns ale hold time t alh 9, 10, 11 10 -- ns data setup time t ds 9, 10, 11 20 -- ns data hold time t dh 9, 10, 11 10 -- ns write cycle time t wc 9, 10, 11 50 -- ns we high hold time t wh 9, 10, 11 15 -- ns t able 11. 69f1608 ac c haracteristics for o peration (v cc = 5 v 10%, t a = -40 to +125 c, unless otherwise noted ) p arameter s ymbol s ubgroups m in m ax u nit data transfer from cell to register t r 9, 10, 11 -- 10 s ale to re delay (read id) t ar1 9, 10, 11 150 -- ns ale to re delay (read cycle) t ar2 9, 10, 11 50 -- ns ce to re delay (id read) t cr 9, 10, 11 100 -- ns ready to re low 1 t rr 9, 10, 11 20 -- ns re pulse width t rp 9, 10, 11 30 -- ns we high to busy t wb 9, 10, 11 -- 100 ns read cycle time t rc 9, 10, 11 50 -- ns re access time t rea 9, 10, 11 -- 35 ns re high to output hi-z 1 t rhz 9, 10, 11 15 30 ns ce high to output hi-z 1 t chz 9, 10, 11 -- 20 ns re high hold time t reh 9, 10, 11 15 -- ns output hi-z to re low 1 t ir 9, 10, 11 0 -- ns last re high to busy (at sequential read) t rb 9, 10, 11 -- 100 ns ce high to ready (in case of interception by ce at read) 2 t cry 9, 10, 11 -- 50 + tr (r/b ) 3 ns ce high hold time (at the last serial read) 4 t ceh 9, 10, 11 100 -- ns re low to status output t rsto 9, 10, 11 -- 35 ns
7 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 nand f lash t echnical n otes invalid block(s) invalid blocks are defined as blocks that contain one or more invalid bits whose reliability is not guaranteed by the manufacturer. typically, an invalid block will contain a single bad bit. the information regarding the invalid block(s) is called the invalid block information. the invalid block information is written to the 1st or the 2nd page of the invalid block(s) with 00h data. devices with invalid block(s) have the same quality level as devices with all valid blocks and have the same ac and dc characteristics. an invalid block(s) does not affect the performance of valid block(s) because it is isolated from the bit line and the common source line by a select transistor. the system design must be able to mask out the invalid block(s) via address mapping. the 1st block of the nand flash, however, is fully guaran- teed to be a valid block. identifying invalid block(s) all device locations are erased (ffh) prior to shipping. therefore, the system must be able to create the invalid block table via the following suggested flow chart (figure 1). ce low to status output t csto 9, 10, 11 -- 45 ns re high to we low t rhw 9, 10, 11 0 -- ns we high to re low t whr 9, 10, 11 60 -- ns re access time (read id) t readid 9, 10, 11 -- 35 ns device resetting time (read/program/erase) after erase suspend t rst 9, 10, 11 -- 5/10/500 s 1. not tested 2. if ce goes high within 30 ns after the rising edge of the last re , r/b will not return to v ol . 3. the time to ready depends on the value of the pull-up resistor tied to r/b pin. 4. to break the sequential read cycle, ce must be held high for longer than t ceh . t able 12. 69f1608 v alid b locks 1,2 1. the device may include invalid blocks. invalid blocks are defined as blocks that contain one or more bad bits. do not try to access these invalid blocks for program and erase. during its life time of 10 years and/or 1 million program/erase cycles, the minimum number of valid blocks are guaranteed though its initial number could be reduced. 2. the 1st block, which is placed on the 00h block address, is guaranteed to be a valid block. p arameter s ymbol m in t yp m ax u nit valid block number n vb 502 508 512 blocks t able 11. 69f1608 ac c haracteristics for o peration (v cc = 5 v 10%, t a = -40 to +125 c, unless otherwise noted ) p arameter s ymbol s ubgroups m in m ax u nit
8 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 1. f low chart to create invalid block table error in write or read operation over its lifetime, additional invalid blocks may occur. the following possible failure modes should be considered to implement a highly reliable system. in the case of status read failure after erase or program, block replacement should be done. to improve the efficiency of memory space, it is recommended that the read or verification failure due to sin- gle bit error be reclaimed by ecc without any block replacement. the said additional block failure rate does not include those reclaimed blocks. ecc: error correcting code / hamming code, etc. example. 1-bit correction and 2-bit detection f ailure m ode d etection and c ountermeasure write erase failure status read after erase / block replacement program failure status read after program / block replacement read back (verify after program) / block replacement or ecc correction read single bit failure verify ecc correction
9 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 2. p rogram flow chart
10 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 3. e rase f low c hart
11 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 4. r ead f low c hart f igure 5. b lock r eplacement
12 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 pointer operation: the 69f1608 has three modes to set the destination of the pointer. the pointer is set to ?a? area by the ?00h? com- mand, to ?b? area by the ?01h? command, and to ?c? area by the ?50h? command. the destination pointer table shows the destination of the pointer, and the block diagram shows the diagram of its operation. t able 12. d estination of p ointer t able f igure 6. b lock d iagram of p ointer o peration
13 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 7. e xamples of p rogramming with s uccessive p ointer o peration t able 13. p oint s tatus a fter e ach o peration system interface using ce don?t-care. for an easier system interface, ce may be inactive during the data-loading or sequential data-reading as shown below. the internal 528 byte page registers are utilized as seperate buffers for this operation and the system design gets more flexible. in addition, for voice or audio applications which use slow cycle time on the order of u-seconds, de- activating ce during the data-loading and reading would provide significant savings in power consumption.
14 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 8. p rogram o peration with ce d on ? t c are f igure 9. r ead o peration w ith ce d on ? t c are
15 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 10. c ommand l atch c ycle f igure 11. a ddress l atch c ycle
16 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 12. i nput d ata l atch c ycle f igure 13. s equential o ut c ycle after r ead (cle = l, we = h, ale = l)
17 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 14. s tatus r ead c ycle f igure 15. read1 o peration (r ead o ne p age )
18 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 16. read1 o peration (i ntercepted by ce ) f igure 17. read2 o peration (r ead o ne p age )
19 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 18. s equential r ow r ead o peration f igure 19. p age p rogram o peration
20 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 20. b lock e rase o peration (e rase o ne b lock ) f igure 21. m anufacture & d evice id r ead o peration
21 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 device operation page read upon initial device power up, the device defaults to read1 mode. this operation is also initiated by writing 00h to the command register along with three address cycles. once the command is latched, it does not need to be written for the following page read operation. three types of operations are available : random read, serial page read and sequential read. the random read mode is enabled when the page address is changed. the 528 bytes of data within the selected page are transferred to the data registers in less than 10 us(t r ). the cpu can detect the completion of this data transfer(t r ) by analyzing the output of r/b pin. once the data in a page is loaded into the regis- ters, they may be read out in 50 ns cycle time by sequentially pulsing re with ce staying low. high to low transitions of the re clock output the data starting from the selected column address up to the last column address(column 511 or 527 depending on state of se pin). after the data of last column address is clocked out, the next page is automatically selected for sequential read. waiting 10 s again allows for reading of the selected page. the sequential read operation is terminated by bringing ce high. the way the read1 and read2 commands work is like a pointer set to either the main area or the spare area. the spare area of bytes 512 to 527 may be selectively accessed by writing the read2 command with se pin low. toggling se during operation is prohibited. addresses a0 to a3 set the starting address of the spare area while addresses a4 to a7 are ignored. unless the operation is aborted, the page address is automatically incremented for sequential read as in read1 operation and spare sixteen bytes of each page may be sequentially read. the read1 command (00h/01h) is needed to move the pointer back to the main area. figures 22 thru 25 show typical sequence and timings for each read opera- tion.
22 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 22. read1 o peration
23 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 23. read2 o peration
24 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 24. s equential r ow read1 o peration f igure 25. s equential read2 o peration (se = fixed low )
25 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 page program the device is programmed basically on a page basis, but it does allow multiple partial page programming of a byte or consecutive bytes up to 528, in a single page program cycle. the number of consecutive partial page programming operation within the same page without an intervening erase operation must not exceed ten. the addressing may be done in any random order in a block. a page program cycle consists of a serial data loading period in which up to 528 bytes of data may be loaded into the page register, followed by a non- volatile programming period where the loaded data is programmed into the appropriate cell. serial data loading can be started from 2nd half array. about the pointer operation, please refer to the attached technical notes.the serial data loading period begins by inputting the serial data input command (80h), followed by the three cycle address input and then serial data loading. the bytes other than those to be programmed do not need to be loaded. the page program confirm command (10h) initiates the programming process. writing 10h alone without perviously entering the serial data will not initiate the programming process. the internal write controller automatically executes the algorithms and timings necessary for program and verify, thereby freeing the cpu for other tasks. once the program process starts, the read status register command may be entered, with re and ce low, to read the status register. the cpu can detect the completion of a program cycle by monitoring the r/b output, or the status bit (i/o6) of the status register. only the read status command and reset command are valid while programming is in progress. when the page program is complete, the write status bit (i/o0) may be checked (figure 26). the internal write verify detects only errors for "1"s that are not successfully programmed to "0"s. the command register remains in read status command mode until another valid command is written to the command register. f igure 26. p rogram & r ead s tatus operation
26 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 block erase the erase operation can erase on a block (8k byte) basis. block address loading is accomplished in two cycles initiated by an erase setup command (60h). only address a13 to a21 is valid while a9 to a12 is ignored. the addresses of the block to be erased to ffh. the erase confirm command (d0h) following the block address loading initiates the internal erasing process. this two-step sequence of setup followed by execution ensures that memory contents are not accidentally erased due to external noise conditions. at the rising edge of we after the erase confirm command input, the internal write controller handles erase and erase-verify. when the erase operation is completed, the write status bit (i/o0) may be checked. figure 27 details the sequence. f igure 27. b lock e rase o peration read status the device contains a status register which may be read to find out whether program or erase operation is complete, and whether the program or erase operation completed successfully. after writing 70h command to the command register, a read cycle outputs the contents of the status register to the i/o pins on the fall- ing edge of ce or re , whichever occurs last. this two line control allows the system to poll the progress of each device in multiple memory connections even when r/b pins are common-wired. re or ce does not need to be toggled for updated status. refer to table 14 for specific status register definitions. the com- mand register remains in status read mode until further commands are issued to it. therefore, if the status register is read during a random read cycle, a read command (00h or 50h) should be given before sequential page read cycle.
27 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 t able 14. r ead s tatus r egister d efinition read id the device contains a product identification mode, initiated by writing 90h to the command register, followed by an address input of 00h. two read cycles sequentially output the manufacture code(ech), and the device code (e3h) respectively. the command register remains in read id mode until further commands are issued to it. figure 28 shows the operation sequence. f igure 28. r ead id o peration
28 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 reset the device offers a reset feature, executed by writing ffh to the command register. when the device is in busy state during random read, program or erase modes, the reset operation will abort these operation. the contents of memory cells being altered are no longer valid, as the data will be partially programmed or erased. internal address registers are cleared to "0"s and data registers to "1"s. the command register is cleared to wait for the next command, and the status register is cleared to value c0h when wp is high. refer to table 15 for device status after reset operation. if the device is already in reset state a new reset command will not be accepted to by the command register. the r/b pin transitions to low for t rst after the reset command is written. reset command is not necessary for normal operation. refer to figure 29 below. f igure 29. reset o peration t able 15. d evice s tatus data protection the device is designed to offer protection from any involuntary program/erase during power-transitions. an internal voltage detector disables all functions whenever v cc is below about 2v. wp pin provides hardware protection and is recommended to be kept at v il during power-up and power-down as shown in figure 30. the two step command sequence for program/erase provides additional software protection.
29 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 30. ac w aveforms for p ower t ransition ready/busy the device has a r/b output that provides a hardware method of indicating the completion of a page pro- gram, erase and random read completion. the r/b pin is normally high but transitions to low after program or erase command is written to the command register or random read is begin after address loading. it returns to high when the internal controller has finished the operation. the pin is an open-drain driver thereby allowing two or more r/b outputs to be or-tied. an appropriate pull-up resister is required for proper operation and the value may be calculated by following equation.
30 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 f igure 31. ready/busy
31 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 note: all dimensions in inches 24 p in r ad -p ak ? f lat p ackage s ymbol d imension m in n om m ax a 0.284 0.310 0.336 a2 0.030 0.035 0.040 b 0.013 0.016 0.018 c 0.006 0.008 0.010 d 0.810 0.820 0.830 d2 0.780 0.800 0.820 e 1.132 1.140 1.148 e1 -- -- 1.170 e2 2.020 2.240 2.464 e3 0.960 0.980 1.000 e 0.050 bsc l 0.410 0.420 0.430 q 0.212 0.230 0.248 s1 0.000 0.038 -- n24
32 all data sheets are subject to change without notice ?2008 maxwell technologies all rights reserved. 128 megabit (16m x 8-bit) flash memory module 69f1608 03.07.08 rev 3 important notice: these data sheets are created using the chip manufacturer?s published specifications. maxwell technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. the specifications presented within these data sheets represent the latest and most accurate information available to date. however, these specifications are subject to change without notice and maxwell technologies assumes no responsibility for the use of this information. maxwell technologies? products are not authorized for use as critical components in life support devices or systems without express written approval from maxwell technologies. any claim against maxwell technologies must be made within 90 days from the date of shipment from maxwell tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.

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