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features ? single voltage, range 3v to 3.6v supply 3-volt only read and write operation software protected programming fast read access time ? 150 ns low power dissipation ? 15 ma active current ? 40 a cmos standby current sector program operation ? single cycle reprogram (erase and program) ? 2048 sectors (256 bytes/sector) ? internal address and data latches for 256 bytes two 16k bytes boot blocks with lockout fast sector program cycle time ? 20 ms max internal program control and timer data polling for end of program detection typical endurance > 10,000 cycles cmos and ttl compatible inputs and outputs commercial and industrial temperature ranges green (pb/halide-free) packaging option 1. description the at29lv040a is a 3-volt only in-system flash programmable and erasable read only memory (perom). its 4 megabits of memory is organized as 524,288 words by 8 bits. manufactured with atmel?s advanced nonvolatile cmos eeprom technology, the device offers access times to 150 ns, and a low 54 mw power dissipation. when the device is deselected, the cmos standby current is less than 40 a. the device endurance is such that any sector can typically be written to in excess of 10,000 times. the programming algorithm is compatib le with other devices in atmel?s 3-volt only flash memories. to allow for simple in-system reprogrammability, the at29lv040a does not require high input voltages for programming. three-volt-only commands determine the opera- tion of the device. reading data out of the device is similar to reading from an eprom. reprogramming the at29lv040a is performed on a sector basis; 256 bytes of data are loaded into the device and then simultaneously programmed. during a reprogram cycle, the address locations and 256 bytes of data are captured at microprocessor speed and internally latched, freeing the address and data bus for other operations. following the initiation of a program cycle, the device will automati- cally erase the sector and then program the latched data using an internal control timer. the end of a program cycle can be detected by data polling of i/o7. once the end of a program cycle has been detected, a new access for a read or program can begin. 4-megabit (512k x 8) 3-volt only 256-byte sector flash memory at29lv040a 0334g?flash?2/05
2 0334g?flash?2/05 at29lv040a 2. pin configurations 2.1 32-lead plcc top view 2.2 32-lead tsop (type 1) top view pin name function a0 - a18 addresses ce chip enable oe output enable we write enable i/o0 - i/o7 data inputs/outputs nc no connect 5 6 7 8 9 10 11 12 13 29 28 27 26 25 24 23 22 21 a7 a6 a5 a4 a3 a2 a1 a0 i/o0 a14 a13 a8 a9 a11 oe a10 ce i/o7 4 3 2 1 32 31 30 14 15 16 17 18 19 20 i/o1 i/o2 gnd i/o3 i/o4 i/o5 i/o6 a12 a15 a16 a18 vcc we a17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 a11 a9 a8 a13 a14 a17 we vcc a18 a16 a15 a12 a7 a6 a5 a4 oe a10 ce i/o7 i/o6 i/o5 i/o4 i/o3 gnd i/o2 i/o1 i/o0 a0 a1 a2 a3
3 0334g?flash?2/05 at29lv040a 3. block diagram 4. device operation 4.1 read the at29lv040a is accessed like an eprom. when ce and oe are low and we is high, the data stored at the memory location determined by the address pins is asserted on the outputs. the outputs are put in the high impedance state whenever ce or oe is high. this dual-line con- trol gives designers flexibility in preventing bus contention. 4.2 software data protection programming the at29lv040a has 2048 individual sectors, each 256 bytes. using the software data protec- tion feature, byte loads are used to enter the 256 bytes of a sector to be programmed. the at29lv040a can only be programmed or reprogrammed using the software data protection fea- ture. the device is programmed on a sector basis. if a byte of data within the sector is to be changed, data for the entire 256-byte sector must be loaded into the device. the at29lv040a automatically does a sector erase prior to loading the data into the sector. an erase command is not required. software data protection protects the device from inadvertent programming. a series of three program commands to specific addresses with specific data must be presented to the device before programming may occur. the same three program commands must begin each program operation. all software program commands must obey the sector program timing specifications. power transitions will not reset the software data protection feature, however the software fea- ture will guard against inadvertent program cycles during power transitions. any attempt to write to the device without the 3-byte command sequence will start the internal write timers. no data will be written to the device; however, for the duration of t wc , a read opera- tion will effectively be a polling operation. after the software data protection?s 3-byte command code is given, a byte load is performed by applying a low pulse on the we or ce input with ce or we low (respectively) and oe high. the address is latched on the falling edge of ce or we , whichever occurs last. the data is latched by the first rising edge of ce or we . the 256 bytes of data must be loaded into each sector. any byte that is not loaded during the programming of its sector will be erased to read ffh. once the bytes of a sector are loaded into the device, they are simultaneously programmed during the internal programming period. after
4 0334g?flash?2/05 at29lv040a the first data byte has been loaded into the devic e, successive bytes are entered in the same manner. each new byte to be programmed must have its high-to-low transition on we (or ce ) within 150 s of the low-to-high transition of we (or ce ) of the preceding byte. if a high-to-low transition is not detected within 150 s of the last low-to-high transition, the load period will end and the internal programming period will start. a8 to a18 specify the sector address. the sector address must be valid during each high-to-low transition of we (or ce ). a0 to a7 specify the byte address within the sector. the bytes may be loaded in any order; sequential loading is not required. once a programming operation has been initiated, and for the duration of t wc , a read operation will effectively be a polling operation. 4.3 hardware data protection hardware features protect against inadvertent programs to the at29lv040a in the following ways: (a) v cc sense ? if v cc is below 1.8v (typical), the pr ogram function is inhibited; (b) v cc power on delay ? once v cc has reached the v cc sense level, the device will automatically time out 10 ms (typical) before programming; (c) program inhibit ? holding any one of oe low, ce high or we high inhibits program cycles; and (d) noise filter ? pulses of less than 15 ns (typical) on the we or ce inputs will not initiate a program cycle. 4.4 input levels while operating with a 3.3v 10% power supply, the address inputs and control inputs (oe , ce and we ) may be driven from 0 to 5.5v without adversely affecting the operation of the device. the i/o lines can only be driven from 0 to 3.6v. 4.5 product identification the product identification mode identifies the device and manufacturer as atmel. it may be accessed by hardware or software operation. the hardware operation mode can be used by an external programmer to identify the correct programming algorithm for the atmel product. in addition, users may wish to use the software product identification mode to identify the part (i.e., using the device code), and have the system software use the appropriate sector size for pro- gram operations. in this manner, the user can have a common board design for 256k to 4- megabit densities and, with each density?s sector size in a memory map, have the system soft- ware apply the appropriate sector size. for details, see operating modes (for hardware operation) or software product identification. the manufacturer and device code is the same for both modes. 4.6 data polling the at29lv040a features data polling to indicate the end of a program cycle. during a pro- gram cycle an attempted read of the last byte loaded will result in the complement of the loaded data on i/o7. once the program cycle has been completed, true data is valid on all outputs and the next cycle may begin. data polling may begin at any time during the program cycle. 4.7 toggle bit in addition to data polling the at29lv040a provides another method for determining the end of a program or erase cycle. during a program or erase operation, successive attempts to read data from the device will result in i/o6 toggling between one and zero. once the program cycle has completed, i/o6 will stop toggling and valid data will be read. examining the toggle bit may begin at any time during a program cycle.
5 0334g?flash?2/05 at29lv040a 4.8 optional chip erase mode the entire device can be erased by using a 6-byte software code. please see software chip erase application note for details. 4.9 boot block programming lockout the at29lv040a has two designated memory blocks that have a programming lockout feature. this feature prevents programming of data in the designated block once the feature has been enabled. each of these blocks consists of 16k bytes; the programming lockout feature can be set independently for either block. while the lockout feature does not have to be activated, it can be activated for either or both blocks. these two 16k memory sections are referred to as boot blocks . secure code which will bring up a system can be contained in a boot block. the at29lv040a blocks are located in the first 16k bytes of memory and the last 16k bytes of memory. the boot block programming lockout feature can therefore support systems that boot from the lower addresses of memory or the higher addresses. once the programming lockout feature has been activated, the data in that block can no longer be erased or programmed; data in other memo ry locations can still be changed through the regular programming methods. to activate the lockout feature, a series of seven program commands to specific addresses with specific data must be performed. please see boot block lockout feature enable algorithm. if the boot block lockout feature has been activated on either block, the chip erase function will be disabled. 4.9.1 boot block lockout detection a software method is available to determine whether programming of either boot block section is locked out. see software product identification entr y and exit sections. when the device is in the software product identification mode, a read from location 00002h will show if programming the lower address boot block is locked out while reading location. 7fff2h will do so for the upper boot block. if the data is fe, the corresponding block can be programmed; if the data is ff, the program lockout feature has been activated and the corre- sponding block cannot be programmed. the software product identification exit mode should be used to return to standard operation. 5. absolute maximum ratings* temperature under bias................................ -55 c to +125 c *notice: stresses beyond those listed under ?absolute maximum ratings? may cause permanent dam- age to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. storage temperature ..................................... -65 c to +150 c all input voltages (including nc pins) with respect to ground ...................................-0.6v to +6.25v all output voltages with respect to ground .............................-0.6v to v cc + 0.6v voltage on a9 (including nc pins) with respect to ground ...................................-0.6v to +13.5v
6 0334g?flash?2/05 at29lv040a notes: 1. after power is applied and v cc is at the minimum specified datasheet value, the system should wait 20 ms before an opera- tional mode is started. notes: 1. x can be v il or v ih . 2. refer to ac programming waveforms. 3. v h = 12.0v 0.5v. 4. manufacturer code: 1f, device code: c4. 5. see details under software product identification entry/exit. 6. dc and ac operating range at29lv040a-15 at29lv040a-20 at29lv040a-25 operating temperature (case) com. 0c - 70c 0c - 70c 0c - 70c ind. -40c - 85c -40c - 85c -40c - 85c v cc power supply (1) 3.3v 0.3v 3.3v 0.3v 3.3v 0.3v 2. not recommended for new designs. 7. operating modes mode ce oe we ai i/o read v il v il v ih ai d out program (2) v il v ih v il ai d in standby/write inhibit v ih x (1) xx high z program inhibit x x v ih program inhibit x v il x output disable x v ih xhigh z product identification hardware v il v il v ih a1 - a18 = v il , a9 = v h (3) , a0 = v il manufacturer code (4) a1 - a18 = v il , a9 = v h (3) , a0 = v ih device code (4) software (5) a0 = v i manufacturer code (4) a0 = v ih device code (4) 8. dc characteristics symbol parameter condition min max units i li input load current v in = 0v to v cc 1 a i lo output leakage current v i/o = 0v to v cc 1 a i sb1 v cc standby current cmos ce = v cc - 0.3v to v cc com. 40 a ind. 50 a i sb2 v cc standby current ttl ce = 2.0v to v cc 1ma i cc v cc active current f = 5 mhz; i out = 0 ma; v cc = 3.6v 15 ma v il input low voltage 0.6 v v ih input high voltage 2.0 v v ol output low voltage i ol = 1.6 ma; v cc = 3.0v .45 v v oh output high voltage i oh = -100 a; v cc = 3.0v 2.4 v
7 0334g?flash?2/05 at29lv040a 10. ac read waveforms (1)(2)(3)(4) notes: 1. ce may be delayed up to t acc - t ce after the address transition without impact on t acc . 2. oe may be delayed up to t ce - t oe after the falling edge of ce without impact on t ce or by t acc - t oe after an address change without impact on t acc . 3. t df is specified from oe or ce whichever occurs first (cl = 5 pf). 4. this parameter is characterized and is not 100% tested. 9. ac read characteristics symbol parameter at29lv040a-15 at29lv040a-20 at29lv040a-25 units min max min max min max t acc address to output delay 150 200 250 ns t ce (1) ce to output delay 150 200 250 ns t oe (2) oe to output delay 0 50 0 100 0 120 ns t df (3)(4) ce or oe to output float 0 30 0 50 0 60 ns t oh output hold from oe , ce or address, whichever occurred first 00 0 ns note: not recommended for new designs.
8 0334g?flash?2/05 at29lv040a 11. input test waveforms and measurement level 12. output test load note: 1. these parameters are characterized and not 100% tested. t r , t f < 5 ns 13. pin capacitance f = 1 mhz, t = 25c (1) symbol typ max units conditions c in 46pfv in = 0v c out 812pfv out = 0v
9 0334g?flash?2/05 at29lv040a 15. ac byte load waveforms (1)(2) 15.1 we controlled 15.2 ce controlled notes: 1. the 3-byte address and data commands shown on the next page must be applied prior to byte loads. 2. a complete sector (256 bytes) should be loaded using these waveforms shown in these byte load waveform diagrams. 14. ac byte load characteristics symbol parameter min max units t as , t oes address, oe set-up time 10 ns t ah address hold time 100 ns t cs chip select set-up time 0 ns t ch chip select hold time 0 ns t wp write pulse width (we or ce )200ns t ds data set-up time 100 ns t dh , t oeh data, oe hold time 10 ns t wph write pulse width high 200 ns
10 0334g?flash?2/05 at29lv040a 17. software protected program waveform notes: 1. oe must be high when we and ce are both low. 2. a8 through a18 must specify the sector address during each high-to-low transition of we (or ce ) after the software code has been entered. 3. all words that are not loaded within the sector being programmed will be indeterminate. 18. programming algorithm (1) 16. program cycle characteristics symbol parameter min max units t wc write cycle time 20 ms t as address set-up time 10 ns t ah address hold time 100 ns t ds data set-up time 100 ns t dh data hold time 10 ns t wp write pulse width 200 ns t blc byte load cycle time 150 s t wph write pulse width high 200 ns load data aa to address 5555 load data 55 to address 2aaa load data a0 to address 5555 load data to sector (256 bytes) (3) writes enabled enter data protect state (2) notes: 1. data format: i/o7 - i/o0 (hex); address format: a14 - a0 (hex). 2. data protect state will be re-activated at end of program cycle. 3. 256 bytes of data must be loaded.
11 0334g?flash?2/05 at29lv040a notes: 1. these parameters are characterized and not 100% tested. 2. see t oe spec in ac read characteristics. 20. data polling waveforms notes: 1. these parameters are characterized and not 100% tested. 2. see t oe spec in ac read characteristics. 22. toggling bit waveforms (1)(3) notes: 1. toggling either oe or ce or both oe and ce will operate toggle bit. 2. beginning and ending state of i/o6 will vary. 3. any address location may be used by the address should not vary. 19. data polling characteristics (1) symbol parameter min typ max units t dh data hold time 10 ns t oeh oe hold time 10 ns t oe oe to output delay (2) ns t wr write recovery time 0 ns 21. toggle bit characteristics (1) symbol parameter min typ max units t dh data hold time 10 ns t oeh oe hold time 10 ns t oe oe to output delay (2) ns t oehp oe high pulse 150 ns t wr write recovery time 0 ns
12 0334g?flash?2/05 at29lv040a 23. software product identification entry (1) 24. software product identification exit (1) notes: 1. data format: i/o7 - i/o0 (hex); address format: a14 - a0 (hex). 2. a1 - a18 = v il . manufacturer code is read for a0 = v il ; device code is read for a0 = v ih . 3. the device does not remain in identification mode if powered down. 4. the device returns to standard operation mode. 5. manufacturer code is 1f. the device code is c4. load data aa to address 5555 load data 55 to address 2aaa load data 90 to address 5555 pause 20 ms enter product identification mode (2)(3)(5) load data aa to address 5555 load data 55 to address 2aaa load data f0 to address 5555 pause 20 ms exit product identification mode (4) 25. boot block lockout feature enable algorithm (1) notes: 1. data format: i/o7 - i/o0 (hex); address format: a14 - a0 (hex). 2. lockout feature set on lower address boot block. 3. lockout feature set on higher address boot block. load data aa to address 5555 load data 55 to address 2aaa load data 80 to address 5555 load data aa to address 5555 load data 55 to address 2aaa load data 40 to address 5555 load data 00 to address 00000h (2) pause 20 ms load data ff to address fffffh (3) pause 20 ms
13 0334g?flash?2/05 at29lv040a 26. ordering information 26.1 standard package t acc (ns) i cc (ma) ordering code package operation range active standby 150 15 0.04 AT29LV040A-15JC at29lv040a-15tc 32j 32t commercial (0 to 70 c) 15 0.05 at29lv040a-15ji at29lv040a-15ti 32j 32t industrial (-40 to 85 c) 200 15 0.04 at29lv040a-20jc at29lv040a-20tc 32j 32t commercial (0 to 70 c) 15 0.05 at29lv040a-20ji at29lv040a-20ti 32j 32t industrial (-40 to 85 c) 250 15 0.04 at29lv040a-25jc at29lv040a-25tc 32j 32t commercial (0 to 70 c) 15 0.05 at29lv040a-25ji at29lv040a-25ti 32j 32t industrial (-40 to 85 c) note: not recommended for new designs. 26.2 green package option (pb/halide-free) t acc (ns) i cc (ma) ordering code package operation range active standby 150 15 0.05 at29lv040a-15ju at29lv040a-15tu 32j 32t industrial (-40 to 85 c) package type 32j 32-lead, plastic j-leaded chip carrier (plcc) 32t 32-lead, thin small outline package (tsop)
14 0334g?flash?2/05 at29lv040a 27. packaging information 27.1 32j ? plcc drawing no. rev. 2325 orchard parkway san jose, ca 95131 r title 32j , 32-lead, plastic j-leaded chip carrier (plcc) b 32j 10/04/01 1.14(0.045) x 45? pin no. 1 identifier 1.14(0.045) x 45? 0.51(0.020)max 0.318(0.0125) 0.191(0.0075) a2 45? max (3x) a a1 b1 e2 b e e1 e d1 d d2 common dimensions (unit of measure = mm) symbol min nom max note notes: 1. this package conforms to jedec reference ms-016, variation ae. 2. dimensions d1 and e1 do not include mold protrusion. allowable protrusion is .010"(0.254 mm) per side. dimension d1 and e1 include mold mismatch and are measured at the extreme material condition at the upper or lower parting line. 3. lead coplanarity is 0.004" (0.102 mm) maximum. a 3.175 ? 3.556 a1 1.524 ? 2.413 a2 0.381 ? ? d 12.319 ? 12.573 d1 11.354 ? 11.506 note 2 d2 9.906 ? 10.922 e 14.859 ? 15.113 e1 13.894 ? 14.046 note 2 e2 12.471 ? 13.487 b 0.660 ? 0.813 b1 0.330 ? 0.533 e 1.270 typ
15 0334g?flash?2/05 at29lv040a 27.2 32t ? tsop 2325 orchard parkway san jose, ca 95131 title drawing no. r rev. 32t , 32-lead (8 x 20 mm package) plastic thin small outline package, type i (tsop) b 32t 10/18/01 pin 1 d1 d pin 1 identifier b e e a a1 a2 0o ~ 8o c l gage plane seating plane l1 common dimensions (unit of measure = mm) symbol min nom max note notes: 1. this package conforms to jedec reference mo-142, variation bd. 2. dimensions d1 and e do not include mold protrusion. allowable protrusion on e is 0.15 mm per side and on d1 is 0.25 mm per side. 3. lead coplanarity is 0.10 mm maximum. a ? ? 1.20 a1 0.05 ? 0.15 a2 0.95 1.00 1.05 d 19.80 20.00 20.20 d1 18.30 18.40 18.50 note 2 e 7.90 8.00 8.10 note 2 l 0.50 0.60 0.70 l1 0.25 basic b 0.17 0.22 0.27 c 0.10 ? 0.21 e 0.50 basic
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