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may 2006 rev 2 1/9 1 m87c257 address latched 256 kbit (32kb x8) uv eprom and otp eprom feature summary 5v 10% supply voltage in read operation integrated address latch access time: 45ns low power consumption: ? active current 30ma ? standby current 100a programming voltage: 12.75v 0.25v programming times of around 3s electronic signature ? manufacturer code: 20h ? device code: 80h ecopack? packages available 1 28 fdip28w (f) plcc32 (c) www.st.com obsolete product(s) - obsolete product(s)
contents m87c257 2/22 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 two line output control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 system considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.6 presto ii programming algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.7 program inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.8 program verify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.9 electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.10 erasure operation (applies for uv eprom) . . . . . . . . . . . . . . . . . . . . . . . 10 3 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 obsolete product(s) - obsolete product(s)
m87c257 list of tables 3/22 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3. operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 4. electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 5. ac measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 6. capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 7. read mode dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 8. programming mode dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 9. read mode ac characteristics 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 10. read mode ac characteristics 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 11. programming mode ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 12. fdip28wb - 28 pin ceramic frit -seal dip, with win dow (round 0.280"), package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 13. plcc32 - 32 pin rectangular plastic leaded chip carrier, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 14. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 15. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 obsolete product(s) - obsolete product(s)
list of figures m87c257 4/22 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. dip connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. lcc connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. programming flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 5. ac testing input output waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 6. ac testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 7. read mode ac waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 8. programming and verify modes ac waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 9. fdip28w - 28 pin ceramic frit-seal dip, with window, package outline . . . . . . . . . . . . . . 18 figure 10. plcc32 - 32 pin rectangular plastic leaded chip carrier, package outline. . . . . . . . . . . 19 obsolete product(s) - obsolete product(s)
m87c257 description 5/22 1 description the m87c257 is a 256 kbit eprom offered in the two ranges uv (ultra violet erase) and otp (one time programmable). it incorporates latches for all address inputs to minimize chip count, reduce cost, and simplify the design of multiplexed bus systems and is organized as 32,768 by 8 bits. the fdip28w (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. a new pattern can then be written to the device by following the programming procedure. for applications where the content is programmed only one time and erasure is not required, the m87c257 is offered in plcc32 package. in order to meet environmental requirements, st offers the m87c257 in ecopack? packages. ecopack packages are lead-free. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com . figure 1. logic diagram ai00928b 15 a0-a14 asv pp q0-q7 v cc m87c257 g e v ss 8 obsolete product(s) - obsolete product(s)
description m87c257 6/22 figure 2. dip connections figure 3. lcc connections table 1. signal names a0-a14 address inputs q0-q7 data outputs e chip enable g output enable as v pp address strobe / program supply v cc supply voltage v ss ground nc not connected internally du don?t use a1 a0 q0 a7 a4 a3 a2 a6 a5 a13 a10 a8 a9 q7 a14 a11 g e q5 q1 q2 q3 v ss q4 q6 a12 asv pp v cc ai00929 m87c257 8 1 2 3 4 5 6 7 9 10 11 12 13 14 16 15 28 27 26 25 24 23 22 21 20 19 18 17 ai00930 a13 a8 a10 q4 17 a0 nc q0 q1 q2 du q3 a6 a3 a2 a1 a5 a4 9 a14 a9 1 asv pp a11 q6 a7 q7 32 du v cc m87c257 a12 nc q5 g e 25 v ss obsolete product(s) - obsolete product(s)
m87c257 device operation 7/22 2 device operation the modes of operation of the m87c257 are listed in the operating modes. a single power supply is required in the read mode. all inputs are ttl levels except for v pp and 12v on a9 for electronic signature. 2.1 read mode the m87c257 has two control functions, both of which must be logically active in order to obtain data at the outputs. chip enable (e ) is the power control and should be used for device selection. output enable (g ) is the output control and should be used to gate data to the output pins, independent of device selection. assuming that the addresses are stable (as = v ih ) or latched (as = v il ), the address access time (t avqv ) is equal to the delay from e to output (t elqv ). data is available at the output after delay of t glqv from the falling edge of g , assuming that e has been low and the addresses have been stable for at least t avqv - t glqv .the m87c257 reduces the hardware interface in multiplexed address-data bus systems. the processor multiplexed bus (ad0-ad7) may be tied to the m87c257's address and data pins. no separate address latch is needed because the m87c257 latches all address inputs when as is low. 2.2 standby mode the m87c257 has a standby mode which reduces the active current from 30ma to 100a (address stable). the m87c257 is placed in the standby mode by applying a cmos high signal to the e input. when in the standby mode, the outputs are in a high impedance state, independent of the g input. 2.3 two line output control because eproms are usually used in larger me mory arrays, this product features a 2 line control function which accommodates the use of multiple memory connection. the two line control function allows: the lowest possible memory power dissipation, complete assurance that output bus contention will not occur. for the most efficient use of these two control lines, e should be decoded and used as the primary device selecting function, while g should be made a common connection to all devices in the array and connected to the read line from the system control bus. this ensures that all deselected memory devices are in their low power standby mode and that the output pins are only active when data is desired from a particular memory device. obsolete product(s) - obsolete product(s)
device operation m87c257 8/22 2.4 system considerations the power switching characteristics of advance cmos eproms require careful decoupling of the devices. the supply current, i cc , has three segments that are of interest to the system designer: the standby current level, the active current level, and transient current peaks that are produced by the fallin g and rising edges of e . the magnitude of this transient current peaks is dependent on the capacitive and inductive loading of the device at the output. the associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. it is recommended that a 0.1f ceramic capacitor be used on every device between v cc and v ss . this should be a high frequency capacitor of low inherent inductance and should be placed as close to the device as possible. in addition, a 4.7f bulk elec trolytic capacitor should be used between v cc and v ss for every eight devices. the bulk capacitor should be located near the power supply connection point. the purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of pcb traces. 2.5 programming when delivered (and after each erasure for uv eprom), all bits of the m87c257 are in the '1' state. data is introduced by selectively programming '0's into the desired bit locations. although only '0's will be programmed, both '1 's and '0's can be present in the data word. the only way to change a '0' to a '1' is by die exposition to ultraviolet light (uv eprom). the m87c257 is in the programming mode when v pp input is at 12.75v, g is at v ih and e is pulsed to v il . the data to be programmed is applied to 8 bits in parallel to the data output pins. the levels required for the address and data inputs are ttl. v cc is specified to be 6.25 v 0.25 v. 2.6 presto ii programming algorithm presto ii programming algorithm allows to program the whole array with a guaranteed margin, in a typical time of 3.5 seconds. programming with presto ii involves the application of a sequence of 100s program pulses to each byte until a correct verify occurs (see figure 4 ). during programming and verify operation, a margin mode circuit is automatically activated in order to guarantee that each cell is programmed with enough margin. no overprogram pulse is applied si nce the verify in margin mode provides necessary margin to each programmed cell. obsolete product(s) - obsolete product(s)
m87c257 device operation 9/22 figure 4. programming flowchart 2.7 program inhibit programming of multiple m87c 257s in parallel with different data is also easily accomplished. except for e , all like inputs including g of the parallel m87c257 may be common. a ttl low level pulse applied to a m87c257's e input, with v pp at 12.75v, will program that m87c257. a high level e input inhibits the other m87c257s from being programmed. 2.8 program verify a verify (read) should be performed on the programmed bits to determine that they were correctly programmed. the verify is accomplished with g at v il , e at v ih , v pp at 12.75v and v cc at 6.25v. ai00760b n = 0 last addr verify e = 100 s pulse ++n = 25 ++ addr v cc = 6.25v, v pp = 12.75v fail check all bytes 1st: v cc = 6v 2nd: v cc = 4.2v yes no yes no yes no obsolete product(s) - obsolete product(s)
device operation m87c257 10/22 2.9 electronic signature the electronic signature (es) mode allows the reading out of a binary code from an eprom that will identify its manufacturer an d type. this mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. the es mode is functional in the 25c 5c ambient temperature range that is required when programming the m87c257. to activate the es mode, the programming equipment must force 11.5v to 12.5v on address line a9 of the m87c257, with v cc = v pp = 5v. two identifier bytes may then be sequenced from the device outputs by toggling address line a0 from v il to v ih . all other address lines must be held at v il during electronic signature mode. byte 0 (a0 = v il ) represents the manufacturer code and byte 1 (a0 = v ih ) the device identifier code. when a9 = v id , as need not be toggled to latch each identifier address. for the stmicroelectronics m87c257, these two identifier bytes are given in ta b l e 4 and can be read-out on outputs q7 to q0. 2.10 erasure operation (applies for uv eprom) the erasure characteristics of the m87c257 is such that erasure begins when the cells are exposed to light with wavelengths shorter than approximately 4000 ?. it should be noted that sunlight and some type of fluorescent lamps have wavelengths in the 3000-4000 ? range. research shows that constant exposure to room level fluorescent lighting could erase a typical m87c257 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. if the m87c257 is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque labels be put over the m87c257 window to prevent unintentional erasure. the recommended erasure procedure for the m87c257 is exposure to short wave ultraviolet light which has wavelength 2537?. the integrated dose (i.e. uv intensity x exposure time) for erasure should be a minimum of 15 w-sec/cm 2 . the erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with 12000 w/cm 2 power rating. the m87c257 should be placed within 2.5 cm (1 inch) of the lamp tubes during the erasure. some lamps have a filter on their tubes which should be removed before erasure. obsolete product(s) - obsolete product(s)
m87c257 maximum rating 11/22 3 maximum rating stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality documents. 1. x = v ih or v il , v id = 12v 0.5v. table 2. absolute maximum ratings symbol parameter value unit t a ambient operating temperature (1) 1. depends on range. ?40 to 125 c t bias temperature under bias ?50 to 125 c t stg storage temperature ?65 to 150 c v io (2) 2. minimum dc voltage on input or output is ?0.5v wi th possible undershoot to ?2.0v for a period less than 20ns. maximum dc voltage on output is v cc +0.5v with possible overshoot to v cc +2v for a period less than 20ns. input or output voltage (except a9) ?2 to 7 v v cc supply voltage ?2 to 7 v v a9 (2) a9 voltage ?2 to 13.5 v v pp program supply voltage ?2 to 14 v table 3. operating modes mode e g a9 as v pp q7-q0 read (latched address) v il v il xv il data out read (applied address) v il v il xv ih data out output disable v il v ih xxhi-z program v il pulse v ih xv pp data in verify v ih v il xv pp data out program inhibit v ih v ih xv pp hi-z standby v ih xxxhi-z electronic signature v il v il v id v il codes table 4. electronic signature identifier a0 q7 q6 q5 q4 q3 q2 q1 q0 hex data manufacturer?s code v il 00100000 20h device code v ih 10000000 80h obsolete product(s) - obsolete product(s)
dc and ac parameters m87c257 12/22 4 dc and ac parameters this section summarizes the operating and measurement conditions, and the dc and ac characteristics of the device. the parameters in the dc and ac characteristic tables that follow are derived from tests performed under the measurement conditions summarized in the relevant tables. designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters. figure 5. ac testing input output waveform figure 6. ac testing load circuit table 5. ac measurement conditions high speed standard input rise and fall times 10ns 20ns input pulse voltages 0 to 3v 0.4v to 2.4v input and output timing ref. voltages 1.5v 0.8v and 2v ai01822 3v high speed 0v 1.5v 2.4v standard 0.4v 2.0v 0.8v ai01823b 1.3v out c l c l = 30pf for high speed c l = 100pf for standard c l includes jig capacitance 3.3k ? 1n914 device under test obsolete product(s) - obsolete product(s)
m87c257 dc and ac parameters 13/22 table 6. capacitance (1) (2) 1. t a = 25 c, f = 1 mhz 2. sampled only, not 100% tested. symbol parameter test condition min max unit c in input capacitance v in = 0v 6 pf c out output capacitance v out = 0v 12 pf table 7. read mode dc characteristics (1) (2) 1. t a = 0 to 70 c, ?40 to 85 c; ?40 to 105 c or ?40 to 125 c; v cc = 5v 5% or 5v 10%; v pp = v cc 2. v cc must be applied simultaneously with or before v pp and removed simultaneously or after v pp . symbol parameter test condition min max unit i li input leakage current 0v v in v cc 10 a i lo output leakage current 0v v out v cc 10 a i cc supply current e = v il , g = v il , i out = 0ma, f = 5mhz 30 ma i cc1 supply current (standby) ttl e = v ih, as v pp = v ih , address switching 10 ma e = v ih, as v pp = v il , address stable 1ma i cc2 supply current (standby) cmos e > v cc ? 0.2v, as v pp v cc ? 0.2v, address switching 6ma e > v cc ? 0.2v, as v pp = v ss , address stable 100 a i pp program current v pp = v cc 100 a v il input low voltage ?0.3 0.8 v v ih (3) 3. maximum dc voltage on output is v cc +0.5v. input high voltage 2 v cc + 1 v v ol output low voltage i ol = 2.1ma 0.4 v v oh output high voltage i oh = ?1ma v cc ? 0.8v v table 8. programming mode dc characteristics (1) (2) 1. t a = 25 c; v cc = 6.25v 0.25v; v pp = 12.75v 0.25v 2. v cc must be applied simultaneously with or before v pp and removed simultaneously or after v pp . symbol parameter test condition min max unit i li input leakage current v il v in v ih 10 a i cc supply current 50 ma i pp program current e = v il 50 ma v il input low voltage ?0.3 0.8 v v ih input high voltage 2 v cc + 0.5 v v ol output low voltage i ol = 2.1ma 0.4 v v oh output high voltage ttl i oh = ?1ma v cc ? 0.8 v v id a9 voltage 11.5 12.5 v obsolete product(s) - obsolete product(s)
dc and ac parameters m87c257 14/22 figure 7. read mode ac waveforms ai00931 taxqx tehqz data out a0-a14 e g q0-q7 taslax tghqz tglqv telqv valid hi-z tavqv taslgl tashasl tavasl asv pp obsolete product(s) - obsolete product(s)
m87c257 dc and ac parameters 15/22 table 9. read mode ac characteristics 1 (1) (2) 1. t a = 0 to 70 c, ?40 to 85 c; ?40 to 105 c or ?40 to 125 c; v cc = 5v 5% or 5v 10%; v pp = v cc 2. v cc must be applied simultaneously with or before v pp and removed simultaneously or after v pp . symbol alt parameter test condition m87c257 unit -45 (3) 3. speed obtained with high speed ac measurement conditions. -60 -70 -80 min max min max min max min max t avqv t acc address valid to output valid e = v il , g = v il 45 60 70 80 ns t avasl t al address valid to address strobe low 7777ns t ashasl t ll address strobe high to address strobe low 35 35 35 35 ns t aslax t la address strobe low to address transition 20 20 20 20 ns t aslgl t loe address strobe low to output enable low 20 20 20 20 ns t elqv t ce chip enable low to output valid g = v il 45 60 70 80 ns t glqv t oe output enable low to output valid e = v il 25 30 35 40 ns t ehqz (4) 4. sampled only, not 100% tested. t df chip enable high to output hi-z g = v il 025030030040ns t ghqz (4) t df output enable high to output hi-z e = v il 025030030040ns t axqx t oh address transition to output transition e = v il , g = v il 0000ns obsolete product(s) - obsolete product(s)
dc and ac parameters m87c257 16/22 table 10. read mode ac characteristics 2 (1) (2) 1. t a = 0 to 70 c, ?40 to 85 c; ?40 to 105 c or ?40 to 125 c; v cc = 5v 5% or 5v 10%; v pp = v cc 2. v cc must be applied simultaneously with or before v pp and removed simultaneously or after v pp . symbol alt parameter test condition m87c257 unit -90 -10 -12 -15/-20 min max min max min max min max t avqv t acc address valid to output valid e = v il , g = v il 90 100 120 150 ns t avasl t al address valid to address strobe low 7777ns t ashasl t ll address strobe high to address strobe low 35 35 35 35 ns t aslax t la address strobe low to address tr a n s i t i o n 20 20 20 20 ns t aslgl t loe address strobe low to output enable low 20 20 20 20 ns t elqv t ce chip enable low to output valid g = v il 90 100 120 150 ns t glqv t oe output enable low to output valid e = v il 40 40 50 60 ns t ehqz (3) 3. sampled only, not 100% tested. t df chip enable high to output hi-z g = v il 040030040040ns t ghqz (3) t df output enable high to output hi-z e = v il 040030040040ns t axqx t oh address transition to output transition e = v il , g = v il 0000ns obsolete product(s) - obsolete product(s)
m87c257 dc and ac parameters 17/22 figure 8. programming and verify modes ac waveforms table 11. programming mode ac characteristics (1) (2) 1. t a = 25 c; v cc = 6.25v 0.25v; v pp = 12.75v 0.25v 2. v cc must be applied simultaneously with or before v pp and removed simultaneously or after v pp . symbol alt parameter test condition min max unit t avel t as address valid to chip enable low 2 s t qvel t ds input valid to chip enable low 2 s t vphel t vps v pp high to chip enable low 2 s t vchel t vcs v cc high to chip enable low 2 s t eleh t pw chip enable program pulse width 95 105 s t ehqx t dh chip enable high to input transition 2 s t qxgl t oes input transition to output enable low 2 s t glqv t oe output enable low to output valid 100 ns t ghqz t dfp output enable high to output hi-z 0 130 ns t ghax t ah output enable high to address transition 0ns tavel valid ai00557 a0-a14 q0-q7 asv pp v cc g data in data out e tqvel tvphel tvchel tehqx teleh tglqv tqxgl tghqz tghax program verify obsolete product(s) - obsolete product(s)
package mechanical m87c257 18/22 5 package mechanical figure 9. fdip28w - 28 pin ceramic frit -seal dip, with window, package outline 1. drawing is not to scale. table 12. fdip28wb - 28 pin ceramic frit-seal dip, with window (round 0.280"), package mechanical data symbol millimeters inches typ min max typ min max a5.720.225 a1 0.51 1.40 0.020 0.055 a2 3.91 4.57 0.154 0.180 a3 3.89 4.50 0.153 0.177 b 0.41 0.56 0.016 0.022 b1 1.45 ? ? 0.057 ? ? c 0.23 0.30 0.009 0.012 d 36.50 37.34 1.437 1.470 d233.02? ?1.300? ? e 15.24 ? ? 0.600 ? ? e1 13.06 13.36 0.514 0.526 e2.54? ?0.100? ? ea 14.99 ? ? 0.590 ? ? eb 16.18 18.03 0.637 0.710 l 3.18 4.10 0.125 0.161 4 11 4 11 s 1.52 2.49 0.060 0.098 ?7.11 ? ?0.280? ? n28 28 fdipw-a a3 a1 a l b1 b e d s e1 e n 1 c ea d2 ? eb a2 obsolete product(s) - obsolete product(s)
m87c257 package mechanical 19/22 figure 10. plcc32 - 32 pin rectangular plastic leaded chip carrier, package outline 1. drawing is not to scale. table 13. plcc32 - 32 pin rectangular plastic leaded chip carrier, package mechanical data symbol millimeters inches typ min max typ min max a 3.18 3.56 0.125 0.140 a1 1.53 2.41 0.060 0.095 a2 0.38 ? 0.015 ? b 0.33 0.53 0.013 0.021 b1 0.66 0.81 0.026 0.032 cp 0.10 0.004 d 12.32 12.57 0.485 0.495 d1 11.35 11.51 0.447 0.453 d2 4.78 5.66 0.188 0.223 d3 7.62 ? ? 0.300 ? ? e 14.86 15.11 0.585 0.595 e1 13.89 14.05 0.547 0.553 e2 6.05 6.93 0.238 0.273 e3 10.16 ? ? 0.400 ? ? e 1.27 ? ? 0.050 ? ? f 0.00 0.13 0.000 0.005 r 0.89 ? ? 0.035 ? ? n32 32 plcc-a d e3 e1 e 1 n d1 d3 cp b e2 e b1 a1 a r 0.51 (.020) 1.14 (.045) f a2 e2 d2 d2 obsolete product(s) - obsolete product(s)
part numbering m87c257 20/22 6 part numbering for a list of available options (speed, package, etc...) or for further information on any aspect of this device, please contact the st microelectronics sales office nearest to you. table 14. ordering information scheme example: m87c257 -70 x c 1 x device type m87 supply voltage c = 5v device function 257 = 256 kbit (32kb x 8) speed -45 (1) = 45 ns 1. high speed, see ac characteristi cs section for further information. -60 = 60ns -70 = 70 ns -80 = 80 ns -90 = 90 ns -10 = 100 ns -12 = 120 ns -15 = 150 ns -20 = 200 ns v cc tolerance x = 5% blank = 10% package f = fdip28w c = plcc32 temperature range 1 = 0 to 70 c 3 = ?40 to 125 c 6 = ?40 to 85 c options tr = tape & reel packing obsolete product(s) - obsolete product(s)
m87c257 revision history 21/22 7 revision history table 15. document revision history date revision changes 01-jun-1996 1 initial release. 23-may-2006 2 document converted to new template (sections added, information moved). packages are ecopack? compliant. package specifications updated (see section 5: package mechanical ). x option removed from table 15: document revision history . obsolete product(s) - obsolete product(s)
m87c257 22/22 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorize representative of st, st products are not designed, authorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, nor in products or systems, where failure or malfunction may result in personal injury, death, or severe property or environmental damage. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2006 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com obsolete product(s) - obsolete product(s)

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