View M41T315W-85MH6TR_7022273.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

not for new design this is information on a product still in production but not recommended for new designs. november 2007 rev 3 1/30 1 m41t315y m41t315v, m41t315w serial access phantom rtc supervisor features 3.0v, 3.3v, or 5v operating voltage real-time clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years automatic leap year correction valid up to 2100 automatic switch -over and deselect circuitry choice of power-fail deselect voltages: (v pfd = power-fail deselect voltage) ?m41t315y (a) : v cc = 4.5 to 5.5v 4.25v v pfd 4.50v ?m41t315v: v cc = 3.0 to 3.6v 2.80v v pfd 2.97v ?m41t315w: v cc = 2.7 to 3.3v 2.60v v pfd 2.70v no address space required to communicate with rtc provides nonvolatile su pervisor functions for battery backup of sram full 10% v cc operating range industrial operating temperature range (?40 to +85c) ultra-low battery supply current of 500na (max) optional packaging includes a 28-lead soic and snaphat ? top (to be ordered separately) snaphat package provides direct connection for a snaphat top, which contains the battery and crystal rohs compliant ? lead-free second level interconnect a. contact local st sales office for availability. 16 1 so16 (mq) snaphat (sh) battery & crystal 28 1 soh28 (mh) www.st.com obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
contents m41t315y, m41t315v, m41t315w 2/30 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1 non-volatile supervisor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 data retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3 clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.1 clock register information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.2 am-pm/12/24 mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.3 oscillator and reset bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.4 zero bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w list of tables 3/30 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 2. operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3. ac electrical characteristics (m41t315y). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4. ac electrical characteristics (m41t315v/w) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 5. rtc register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 6. ablolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 7. dc and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 8. capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 9. dc characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 10. crystal electrical characteristics (externally supplied) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 11. power down/up trip points dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 12. so16 - 16-lead plastic small outline (150 mils body width), package mechanical data . . . 23 table 13. soh28 - 28-lead plastic small outline, package mechanical data . . . . . . . . . . . . . . . . . . . 24 table 14. sh - 4-pin snaphat housing for 48mah battery and crystal, package mechanical data . 25 table 15. sh - 4-pin snaphat housing for 120mah ba ttery and crystal, package mechanical data 26 table 16. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 17. snaphat battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 18. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
list of figures m41t315y, m41t315v, m41t315w 4/30 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. 16-pin soic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. 28-pin soic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 4. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 5. m41t315y/v/w to ram/clock interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 6. read mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 7. write mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 8. comparison register definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 9. reset pulse waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 10. ac testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 11. power down/up mode ac waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 12. so16 - 16-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 13. soh28 - 28-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 14. sh - 4-pin snaphat housing for 48mah battery and crystal, package mechanical data . 25 figure 15. sh - 4-pin snaphat housing for 120mah battery and crystal, package outline . . . . . . . . 26 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w description 5/30 1 description the m41t315y/v/w rtc supervisor is a combination of a cmos timekeeper ? and a nonvolatile memory supervisor. power is constantly monitored by the memory supervisor. in the event of power instability or absence, an external battery maintains the timekeeping operation and provides power for a cmos static ram by switching on and invoking write protection to prevent data corruption in the memory and rtc. the clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. the last day of the month is automatically adjusted for months with less than 31 days, including leap year correction. the clock operates in one of two formats: a 12-hour mode with an am/pm indicator; or a 24-hour mode the nonvolatile supervisor supplies all the necessary support circuitry to convert a cmos ram to a nonvolatile memory. the m41t315y/v/w can be interfaced with ram without leaving gaps in memory. the m41t315y/v/w is supplied in a 28-lead soic snaphat? package (which integrates both crystal and battery in a single snaphat top) or a-16 pin soic. the 28-pin, 330mil soic provides sockets with gold plated contacts at both ends for direct connection to a separate snaphat housing containing the battery and crystal. the unique design allows the snaphat battery/crystal package to be mounted on top of the soic package after the completion of the surface mount process. insertion of the snaphat housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface-mounting. the snaphat housing is also keyed to prevent reverse insertion. the 28-pin soic and battery/crystal packages are shipped separately in plastic anti-static tubes or in tape & reel form. for the 28-lead soic, the battery/crystal package (e.g., snaphat) part number is ?m4txx-br12sh? (see table 17 on page 28 ). caution: do not place the snaphat batt ery/crystal top in conductive foam, as this will drain the lithium button-cell battery. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
description m41t315y, m41t315v, m41t315w 6/30 figure 1. logic diagram 1. for 16-pin soic only table 1. signal names xi-xo 32.768 khz crystal connection d data input q data output rst reset input ceo chip enable output cei chip enable input v bat battery input oe output enable input we write enable input v cco switched supply voltage output v cci supply voltage input v ss ground nc not connected internally du don?t use ai03902 q d v cci m41t315y m41t315v m41t315w oe v ss cei we ceo rst v cco v bat xi xo (1) (1) (1) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w description 7/30 figure 2. 16-pin soic connections figure 3. 28-pin soic connections ai03909 8 2 3 4 5 6 710 16 15 14 13 12 11 1 v bat (1) we v ss rst du oe nc v ss xo v i x cci m41t315y d q cei ceo 9 v cco m41t315w m41t315v ai03910 8 2 3 4 5 6 7 9 10 11 12 13 14 22 21 20 19 18 17 16 15 28 27 26 25 24 23 1 nc v ss v ss nc nc v e w cci m41t315y nc nc nc nc nc q d nc nc cei ceo nc oe nc du nc rst nc nc v cco nc m41t315v m41t315w obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
description m41t315y, m41t315v, m41t315w 8/30 figure 4. block diagram ai03636b 32,768 hz crystal cei oe we rst ceo clock/calendar logic timekeeper register comparison register control logic access enable sequence detector i/o buffers power-fail detect logic d q v cci internal v cc v cco read write power-fail update data v bat xo xi obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w description 9/30 figure 5. m41t315y/v/w to ram/clock interface 32.768 hz crystal cmos sram oe we ceo ce oe oe we we ce cei rst rst v cco v cc d q v cci v bat x 0 x 1 m41t315y/v/w a0-an a0-an data i/o d0-d7 v cc v ss v ss bat ai04258 + obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
operation m41t315y, m41t315v, m41t315w 10/30 2 operation figure 6 on page 11 illustrates the main elements of th e device. the following paragraphs describe the signals and functions. communication with the clock is established by pattern recognition of a serial bit stream of 64 bits which must be matched by executing 64 consecutive write cycles containing the proper data on data in (d). all accesses which occur prior to recognition of the 64-bit pattern are directed to memory via the chip enable output pin (ceo ). after recognition is established, the next 64 r ead or write cycles either extract or update data in the clock and ceo remains high during this time, disabling the connected memory (see table 2 on page 11 ). data transfer to and from the timekeeping function is accomplished with a serial bit stream under control of chip enable input (cei ), output enable (oe ), and write enable (we ). initially, a read cycle using the cei and oe control of the clock starts the pattern recognition sequence by moving the pointer to the first bit of the 64-bit comparison register. next, 64 consecutive write cycles are executed using the cei and we control of the clock. these 64 write cycles are used only to gain access to the clock. when the first write cycle is executed, it is compared to the first bit of the 64-bit comparison register. if a match is found, the pointer increments to the next location of the comparison register and awaits the next write cycle. if a match is not found, the pointer does not advance and all subsequent write cycles are ignored. if a read cycle occurs at any time during pattern recognition, the present sequence is aborted and the comparison register pointer is reset. pattern recognition continues for a total of 64 write cycles as described above until all the bits in the comparison register have been matched (see figure 8 on page 14 ). with a correct match for 64 bits, access to the registers is enabled and data transfer to or from the timekeeping register s may proceed. the next 64 cycles will cause the device to either receive data on d, or transmit data on q, depending on the level of oe pin or the we pin. cycles to other locations outside the memory block can be interleaved with cei cycles without interrupting the pattern recognition sequence or data transfer sequence to the device. for a so16 pin package, a standard 32.768 khz quartz crystal can be directly connected to the m41t315y/v/w via pins 1 and 2 (xi, xo). the crystal selected for use should have a specified load capacitance (c l ) of 12.5 pf (see table 10 on page 21 ). obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w operation 11/30 2.1 non-volatile supervisor operation a switch is provided to direct power from the battery input or v cci to v cco with a maximum voltage drop of 0.3 volts. the v cco output pin is used to supply uninterrupted power to cmos sram. the m41t315y/v/w safeguards the clock and ram data by power-fail detection and write protection. power-fail detection occurs when v cci falls below v pfd which is set by an internal bandgap reference. the m41t315y/v/w constantly monitors the v cci supply pin. when v cci is less than v pfd , power-fail circuitry forces the chip enable output (ceo ) to v cci or v bat -0.2 volts for external ram write protection. du ring nominal supply conditions, ceo will track cei with a propagation delay. internally, the m41t315y/v/w aborts any data transfer in progress without changing any of the device registers and prevents future access until v cci exceeds v pfd . figure 5 on page 9 illustrates a typical ram/clock interface. figure 6. read mode waveforms table 2. operating modes mode v cc cei oe we dq power deselect 4.5 to 5.5v or 3.0 to 3.6v or 2.7 to 3.3v v ih x x hi-z hi-z standby write v il xv il d in hi-z active read v il v il v ih hi-z d out active read v il v ih v ih hi-z hi-z active deselect v so to v pfd (min) (1) x x x hi-z hi-z cmos standby deselect v so (1) x x x hi-z hi-z battery back-up mode 1. see table 11 on page 21 for details. data output valid we cei oe q tcw tco trc tow tcoe todo trr tod toe toee ai04259 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
operation m41t315y, m41t315v, m41t315w 12/30 figure 7. write mode waveforms data input stable oe d cei twp twc tcw tdh twr twr we t dh tds ai04261 table 3. ac electrical characteristics (m41t315y) symbol parameter (1) min typ max units t avav t rc read cycle time 65 ns t elqv t co cei access time 55 ns t glqv t oe oe access time 55 ns t elqx t coe cei to output low z 5 ns t glqx t oee oe to output low z 5 ns t ehqz t od cei to output high z 25 ns t ghqz t odo oe to output high z 25 ns t rr read recovery 10 ns t eleh t cw cei pulse width 55 ns t glgh t ow oe pulse width 55 ns t avav t wc write cycle 65 ns t wlwh t wp write pulse width 55 ns t ehax t whax t wr (2) write recovery 10 ns t dveh t dvwh t ds (3) data setup 30 ns t ehdx t whdx t dh (3) data hold time 0 ns t rst rst pulse width 65 ns 1. valid for ambient operating temperature: ta = ?40 to 85c; vcc = 4.5 to 5.5v (except where noted). 2. t wr is a function of the latter occurring edge of we or cei . 3. t dh and t ds are functions of the first occurring edge of we or cei in ram mode. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w operation 13/30 table 4. ac electrical characteristics (m41t315v/w) symbol parameter (1) min typ max units t avav t rc read cycle time 85 ns t elqv t co cei access time 85 ns t glqv t oe oe access time 85 ns t elqx t coe cei to output low z 5 ns t glqx t oee oe to output low z 5 ns t ehqz t od cei to output high z 30 ns t ghqz t odo oe to output high z 30 ns t rr read recovery 20 ns t eleh t cw cei pulse width 65 ns t glgh t ow oe pulse width 60 ns t avav t wc write cycle 85 ns t wlwh t wp write pulse width 60 ns t ehax t whax t wr (2) write recovery 25 ns t dveh t dvwh t ds (3) data setup 35 ns t ehdx t whdx t dh (3) data hold time 5 ns t rst rst pulse width 85 ns 1. valid for ambient operating temperature: ta = ?40 to 85c; vcc = 4.5 to 5.5v (except where noted). 2. t wr is a function of the latter occurring edge of we or cei . 3. t dh and t ds are functions of the first occurring edge of we or cei in ram mode. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
operation m41t315y, m41t315v, m41t315w 14/30 figure 8. comparison register definition note: pattern recognition in ?hex? is c5, 3a, a3, 5c, c5, 3a, a3, and 5c. the odds of this pattern being accidentally duplicated and sending aberrant entries to the rtc is less than 1 in 10 19 . this pattern is sent to the clock lsb to msb. 2.2 data retention most low power srams on the market today can be used with the m41t315y/v/w. there are, however some criteria which should be used in making the final choice of an sram to use. the sram must be designed in a way where the chip enable input disables all other inputs to the sram. this allows inputs to the m41t315y/v/w and srams to be don?t care once v cci falls below v pfd (min). the sram should also guarantee data retention down to v cc = 2.0 volts. the chip enable access time must be sufficient to meet the system needs with the chip enable output propagation delays included. if the sram includes a second chip enable pin (e2), this pin should be tied to v out . if data retention lifetime is a cr itical parameter for the system, it is important to review the data retention current specifications for the particular srams being evaluated. most srams specify a data retention current at 3.0 volts. manufacturers generally specify a typical condition for room temperature along with a worst case condition (generally at elevated temperatures). the system leve l requirements will dete rmine the choice of which value to 7 65 432 1 0 byte 0 byte 1 by te 2 byte 3 by te 4 by te 5 byte 6 by te 7 hex value 0 1 0 0 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 0 1 0 0 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 c5 3a a3 5c c5 3a a3 5c ai04262 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w operation 15/30 use. the data retention current value of the srams can then be added to the ibat value of the m41t315y/v/w to determine the total current requirements for data retention. the available battery capacity for the snaphat ? of your choice can then be divided by this current to determine the amount of data retention available (see table 17 on page 28 ). for a further more detailed review of lifetime calculations, please see application note an1012. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
clock operation m41t315y, m41t315v, m41t315w 16/30 3 clock operation 3.1 clock register information clock information is contained in eight register s of 8 bits, each of which is sequentially accessed 1 bit at a time after the 64-bit pattern recognition sequence has been completed. when updating the clock registers, each must be handled in groups of 8 bits. writing and reading individual bits within a register could produce erroneous results. these read/write registers are defined in table 5 on page 17 . data contained in the clock registers is in bi nary coded decimal format (bcd). reading and writing the registers is always accomplished by stepping though all eight registers, starting with bit 0 of register 0 and ending with bit 7 of register 7. 3.2 am-pm/12/24 mode bit 7 of the hours register is defined as the 12-hour or 24-hour mode select bit. when high, the 12-hour mode is selected. in the 12-hour mode, bit 5 is the am/pm bit with logic high being pm. in the 24-hour mode, bit 5 is the second 10-hour bit (20-23 hours). 3.3 oscillator and reset bits bits 4 and 5 of the day register are used to c ontrol the reset and osc illator functions. bit 4 controls the reset pin input. when the reset bit is set to logic '1,' the reset input pin is ignored. when the reset bit is set to logic '0,' a low inpu t on the reset pin will cause the device to abort data transfer without changing data in the timekeeping registers. reset operates independe ntly of all other inputs. bit 5 controls the oscillator. when set to logic '0,' the oscillator turns on and the real-tim e clock/calendar begins to increment. 3.4 zero bits registers 1, 2, 3, 4, 5, and 6 contain one (1) or more bits that will al ways read logic '0.' when writing to these locations, either a logic '1' or '0' is acceptable. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w clock operation 17/30 keys: a/p = am/pm bit 12/24 = 12 or 24-hour mode bit osc = oscillator bit rst = reset bit 0 = must be set to ?0? figure 9. reset pulse waveform table 5. rtc register map function/range bcd format register d7 d6 d5 d4 d3 d2 d1 d0 0 0.1 seconds 0.01 seconds seconds 00-99 1 0 10 seconds seconds seconds 00-59 2 0 10 minutes minutes minutes 00-59 3 12/24 0 10/ a/p hrs hours (24 hour format) hours 01-12/ 00-23 400osc rst 0 day of the week day 01-07 5 0 0 10 date date: day of the month date 01-31 6 0 0 0 10m month month 01-12 7 10 years year year 00-99 trst rst ai04260 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
maximum rating m41t315y, m41t315v, m41t315w 18/30 4 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. caution: negative undershoots below ?0.3v are not allowed on any pin while in the battery back-up mode. caution: do not wave solder soic to avoid damaging snaphat sockets. table 6. ablolute maximum ratings symbol parameter value unit t a operating temperature ?40 to +85 c t stg storage temperature (v cc , oscillator off) snaphat ? ?40 to +85 c soic ?55 to +125 c t sld (1) lead solder temperature for 10 seconds 260 c v cci supply voltage (on any pin relative to ground) m41t315y ?0.3 to +7.0 v m41t315v/w ?0.3 to +4.6 v v io input or output voltages ?0.3 to v cc to +0.3 v i o output current 20 ma p d power dissipation 1 w 1. for so package, lead-free (pb-fr ee) lead finish: reflow at peak temperature of 260c (total thermal budget not to exceed 245c for greater than 30 seconds). obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w dc and ac parameters 19/30 5 dc and ac parameters this section summarizes the operating and measurement conditions, as well as the dc and ac characteristics of the device. the parameters in the following dc and ac characteristic tables are derived from tests performed under the measurement conditions listed in the relevant tables. designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters. figure 10. ac testing load circuit note: 50pf for m41t315v. table 7. dc and ac measurement conditions parameter m41t315y m41t315v/w v cc supply voltage 4.5 to 5.5v 2.7 to 3.6v ambient operating temperature ?40 to +85 c ?40 to +85 c load capacitance (c l ) 100pf 50pf input rise and fall times 5ns 5ns input pulse voltages 0 to 3v 0 to 3v input and output timing ref. voltages 1.5v 1.5v ai04255 c l c l includes jig capacitance 400 device under test 2.0v table 8. capacitance symbol parameter (1)(2) 1. effective capacitance measured with power supply at 5v; sampled only; not 100% tested. 2. at 25c, f = 1mhz. min max unit c in input capacitance 10 pf c io (3) 3. outputs were deselected. input/output capacitance 10 pf obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
dc and ac parameters m41t315y, m41t315v, m41t315w 20/30 table 9. dc characteristics sym parameter test condition (1) m41t315y m41t315v/w unit ?65 ?85 min typ max min typ max i il (2) input leakage current 0v v in v cc 1 1a i ol output leakage current 0v v out v cc 1 1a i cc1 (3) supply current 10 6 ma i cco1 (4) v cc power supply current v cc0 = v cc1 ? 0.3 150 100 ma i cc2 (3) supply current (ttl standby) cei = v ih 32ma i cc3 (3) v cc power supply current cei = v cc1 ? 0.2 1 1 ma v il (5) input low voltage ?0.3 0.8 ?0.3 0.6 v v ih (5) input high voltage 2.2 v cc1 + 0.3 2.0 v cc + 0.3 v v ol (6) output low voltage i ol = 4.0 ma 0.4 0.4 v v oh (6) output high voltage i oh = ?1.0 ma 2.4 2.4 v v pfd power fail deselect 4.25 4.50 2.80 (v) 2.60 (w) 2.97 (v) 2.70 (w) v v so battery back-up switchover v bat 2.5 v v bat battery voltage 2.5 3.7 2.5 3.7 v v ceo ceo output voltage v cc1 ? 0.2 or v bat ? 0.2 v cc1 ? 0.2 or v bat ? 0.2 v i bat (3) battery current v bat = 3.0v t a = 25 c v cc = 0v 0.5 0.5 a i cco2 (7) battery backup current v cc0 = v bat ? 0.2v 100 100 a 1. valid for ambient operating temperature: ta = ?40 to 85c; vcc = 4.5 to 5.5v or 2.7 to 3.6v (except where noted). 2. applies to all input pins except rst , which is pulled internally to v cci . 3. measured without ram connected. 4. icco1 is the maximum average load current the device can supply to external memory. 5. voltages are referenced to ground. 6. measured with load shown in figure 10 on page 19 . 7. icco2 is the maximum average load current that the dev ice can supply to memory in the battery backup mode. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w dc and ac parameters 21/30 figure 11. power down/up mode ac waveforms table 10. crystal electrical characteristics (externally supplied) symbol parameter (1)(2) 1. these values are externally supplied. stmicroelectronics recommends the kds dt-38: 1ta/1tc252e127, tuning fork type (thruhole) or t he dmx-26s: 1tjs125fh2a212, (smd) quartz crystal for industrial temperature operations. kds c an be contacted at kouhou@ kdsj.co.jp or http://www.kdsj.co.jp for further information on this crystal type. 2. load capacitors are integrated within the m41t315y/v/w . circuit board layout considerations for the 32.768khz crystal of minimum trace l engths and isolation from rf gener ating signals should be taken into account. min typ max unit f o resonant frequency 32.768 khz r s series resistance 60 k c l load capacitance 12.5 pf table 11. power down/up trip points dc characteristics symbol parameter (1)(2) 1. valid for ambient operating temperature: ta = ?40 to 85c; vcc = 4.5 to 5.5v or 2.7 to 3.6v (except where noted). 2. measured at 25c. min max unit t rec v pfd (max) to cei low 1.5 2.5 ms t f v pfd (max) to v pfd (min) v cc fall time 300 s t fb v pfd (min) to v so v cc fall time 10 s t r v pfd (min) to v pfd (max) v cc rise time 0 s t pf cei high to power-fail 0 s t pd (3)(4) 3. measured with load shown in figure 10 on page 19 . 4. input pulse rise and fall times equal 10ns cei propagation delay m41t315y 10 ns m41t315v/w 15 ns v cc v bat 0.2v v bat 0.2v cei ceo tpd tf tpf tr trec tpd v so tfb v pfd (max) v pfd (min) ai04257 don?t care obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
package mechanical data m41t315y, m41t315v, m41t315w 22/30 6 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. 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. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w package mechanical data 23/30 figure 12. so16 - 16-lead plasti c small outline, package outline note: drawing is not to scale so-b e n cp b e a2 d c l a1 h a 1 table 12. so16 - 16-lead plastic small outline (150 mils body width), package mechanical data sym mm inches typ min max typ min max a 1.75 0.069 a1 0.10 0.25 0.004 0.010 a2 1.60 0.063 b 0.35 0.46 0.014 0.018 c 0.19 0.25 0.007 0.010 d 9.80 10.00 0.386 0.394 e 3.30 4.00 0.150 0.158 e1.27 - - 0.050 - - h 5.80 6.20 0.228 0.244 l 0.40 1.27 0.016 0.050 a08 08 n16 16 cp 0.10 0.004 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
package mechanical data m41t315y, m41t315v, m41t315w 24/30 figure 13. soh28 - 28-lead plastic small outline, package outline note: drawing is not to scale. soh-a e n d c l a1 1 h a cp be a2 eb table 13. soh28 - 28-lead plastic small outline, package mechanical data sym mm inches typ min max typ min max a 3.05 0.120 a1 0.05 0.36 0.002 0.014 a2 2.34 2.69 0.092 0.106 b 0.36 0.51 0.014 0.020 c 0.15 0.32 0.006 0.12 d 17.71 18.49 0.697 0.728 e 8.23 8.89 0.324 0.350 e1.27 - - 0.050 - - eb 3.20 3.61 0.126 0.142 h 11.51 12.70 0.453 0.500 l 0.41 1.27 0.016 0.050 a08 08 n28 28 cp 0.10 0.004 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w package mechanical data 25/30 figure 14. sh - 4-pin snaphat housing for 48mah battery and crystal, package mechanical data table 14. sh - 4-pin snaphat housing for 48mah battery and crystal, package mechanical data sym mm inches typ min max typ min max a 9.78 0 0.385 a1 6.73 7.24 0.265 0.285 a2 6.48 6.99 0.255 0.275 a3 0.38 0 0.015 b 0.46 0.56 0.018 0.022 d 21.21 21.84 0.835 0.860 e 14.22 14.99 0.560 0.590 ea 15.55 15.95 0.612 0.628 eb 3.20 3.61 0.126 0.142 l 2.03 2.29 0.080 0.090 shtk-a a1 a d e ea eb a2 b l a3 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
package mechanical data m41t315y, m41t315v, m41t315w 26/30 figure 15. sh - 4-pin snaphat housing for 120mah battery and crystal, package outline table 15. sh - 4-pin snaphat housing for 120mah battery and crystal, package mechanical data sym mm inches typ min max typ min max a 10.54 0 0.415 a1 8.00 8.51 0.315 0.335 a2 7.24 8.00 0.285 0.315 a3 0.38 0 0.015 b 0.46 0.56 0.018 0.022 d 21.21 21.84 0.835 0.860 e 17.27 18.03 0.680 0.710 ea 15.55 15.95 0.612 0.628 eb 3.20 3.61 0.126 0.142 l 2.03 2.29 0.080 0.090 shtk-a a1 a d e ea eb a2 b l a3 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w part numbering 27/30 7 part numbering table 16. ordering information scheme example: m41t 315y ?65 mh 6 e device type m41t supply voltage and write protect voltage 315y (1) = v cc = 4.5 to 5.5v; v pfd = 4.25 to 4.50v 1. contact local sales office 315v = v cc = 3.0 to 3.6v; v pfd = 2.80 to 2.97v 315w = v cc = 2.7 to 3.3v; v pfd = 2.60 to 2.70v speed ?65 = 65ns (315y) ?85 = 85ns (315v/w) package mh (2) = soh28 2. the soic package (soh28) requires the snaphat ? battery package which is ordered separately under the part number ?m4txx-br12shx? in plastic tube or ?m4t xx-br12shxtr? in tape & reel form (see table 17 on page 28 ). mq = so16 temperature range 6 = ?40 to 85c shipping method for soh28: blank = tubes (not for new design - use e) e = lead-free package (ecopack ? ), tubes f = lead-free package (ecopack ? ), tape & reel tr = tape & reel (not for new design - use f) for soh16: blank = tubes (not for new design - use e) e = lead-free package (ecopack ? ), tubes f = lead-free package (ecopack ? ), tape & reel tr = tape & reel (not for new design - use f) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
part numbering m41t315y, m41t315v, m41t315w 28/30 caution: do not place the snaphat battery package ?m 4txx-br12sh? in conductive foam as it will drain the lithium button-cell battery. for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. table 17. snaphat battery table part number description package m48t28-br12sh lithium battery (48mah) snaphat sh m48t32-br12sh lithium battery (120mah) snaphat sh obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w revision history 29/30 8 revision history table 18. document revision history date revision changes jun-2001 1.0 first issue 17-jul-2001 1.1 basic formatting changes 18-sep-2001 1.2 changed pin 8 in 28-pin to v ss 27-sep-2001 1.3 added ambient temp to dc characteristics table ( ta bl e 9 ) 01-may-2002 1.4 modify reflow time and temperature footnote ( ta bl e 6 ) 04-nov-2002 1.5 modify crystal electrical characteristics table footnotes ( ta b l e 1 0 ); add marketing status ( ta bl e 1 6 ) 26-mar-2003 1.6 update test condition ( ta b l e 9 ) 08-jun-2004 2.0 reformatted; add lead-free information 26-nov-2007 3 reformatted document; product status not for new design; added lead-free second level interconnect information to cover page and section 6: package mechanical data ; updated ta bl e 6 . obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
m41t315y, m41t315v, m41t315w 30/30 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 authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, 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. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. 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. ? 2007 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) obsolete product(s) - obsolete product(s)

▲Up To Search▲

Price & Availability of M41T315W-85MH6TR

	To Download M41T315W-85MH6TR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .