M48T201Y-70MH1E STMicroelectronics, M48T201Y-70MH1E Datasheet
M48T201Y-70MH1E
Specifications of M48T201Y-70MH1E
M48T201Y-70MH1
Related parts for M48T201Y-70MH1E
M48T201Y-70MH1E Summary of contents
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... Year 2000 compliant ■ Battery low flag ■ Integrated real time clock, power-fail control circuit, battery and crystal ■ Watchdog timer ■ Choice of write protect voltages (V = power-fail deselect voltage): PFD – M48T201Y 4 4.1V V 4.5 V PFD – M48T201V 3 3.0 V PFD ■ ...
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... Reset inputs (RSTIN1 & RSTIN2 3.10 Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.11 Battery low warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.12 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.13 V noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 2/37 ® registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 M48T201Y, M48T201V ...
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... M48T201Y, M48T201V 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Contents 3/37 ...
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... Table 18. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ® Table 19. SNAPHAT battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4/37 ® , pack. mech. data . . . . . . . . . . . . . . . 31 ® housing for 48 mAh battery & crystal, pack. mech. data . . . . . . . 32 ® housing for 120 mAh battery & crystal, pack. mech. data . . . . . . 33 M48T201Y, M48T201V ...
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... M48T201Y, M48T201V List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 3. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 4. G timing when switching between RTC and external SRAM . . . . . . . . . . . . . . . . . . . . 11 CON Figure 5. Read cycle timing: RTC and external RAM control signals . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 6. Write cycle timing: RTC and external RAM control signals Figure 7 ...
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... Description 1 Description The M48T201Y/V are self-contained devices that include a real time clock (RTC), programmable alarms, a watchdog timer, and a square wave output which provides control 512 external low-power static RAM. Access to all RTC functions and the external RAM is the same as conventional bytewide SRAM. The 16 TIMEKEEPER registers offer year, month, date, day, hour, minute, second, calibration, alarm, century, watchdog, and square wave output data ...
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... M48T201Y, M48T201V Table 1. Signal names A0-A18 DQ0-DQ7 RSTIN1 RSTIN2 RST WDI CON G CON IRQ/FT SQW V OUT Address inputs Data inputs / outputs Reset 1 input Reset 2 Input Reset output (open drain) Watchdog input Chip enable input Output enable Input WRITE enable input RAM chip enable output ...
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... RSTIN1 1 44 RSTIN2 2 43 RST A18 5 40 A16 6 39 A14 7 38 A12 M48T201Y M48T201V WDI CON 18 27 DQ0 19 26 DQ1 20 25 DQ2 AI02241 M48T201Y, M48T201V OUT SQW IRQ/FT A17 A15 A13 A8 A9 A11 A10 E E CON DQ7 DQ6 DQ5 DQ4 DQ3 NC ...
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... M48T201Y, M48T201V Figure 3. Hardware hookup 32,768 Hz CRYSTAL LITHIUM 5V CELL 0 the second chip enable pin (E2) is unused, it should be tied to V A0-A18 V OUT 0.1 F M48T201Y ECON G WDI GCON RSTIN1 RST RSTIN2 IRQ/ SQW DQ0-DQ7 . OUT Description A0-Axx (1) CMOS SRAM DQ0-DQ7 AI00604 9/37 ...
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... The M48T201Y/V also has its own power-fail detect circuit. This control circuitry constantly monitors the supply voltage for an out of tolerance condition. When V tolerance, the circuit write protects the TIMEKEEPER providing data security in the midst of unpredictable system operation ...
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... The unique address specified by the address inputs (A0-A18) defines which one of the on-chip TIMEKEEPER When the address presented to the M48T201Y the range of 7FFFFh-7FFF0h, one of the on-board TIMEKEEPER registers is accessed and valid data will be available to the eight data output drivers within t the E and G access times are also satisfied ...
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... Read cycle timing: RTC and external RAM control signals ADDRESS CON E CON tEPD W tGLQX DQ0-DQ7 12/37 READ READ tAVAV tAVAV tELQV tAVQV tELQX tGLQV tAXQX DATA OUT VALID M48T201Y, M48T201V WRITE tAVAV tAVWL tWHAX tRO tWLWH tGHQZ DATA OUT DATA IN VALID VALID AI02334 ...
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... E and G a low on W will disable the outputs t When the address value presented to the M48T201Y/V during the WRITE is in the range of 7FFFFh-7FFF0h, one of the on-board TIMEKEEPER will be written into the device. When the address value presented to M48T201Y/V is outside the range of TIMEKEEPER registers, an external SRAM location is selected ...
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... E CON G tRO G CON tAVWL W DATA OUT DQ0-DQ7 VALID 14/37 WRITE WRITE tAVAV tAVAV tAVEH tAVWH tELEH tEHAX tWHAX tEPD tEHDX tWLWH tEHQZ tDVEH tDVWH DATA IN VALID M48T201Y, M48T201V READ tAVAV tAVQV tGLQV tWHQX tWLQZ tWHDX DATA IN DATA OUT VALID VALID AI02336 ...
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... With valid V applied, the M48T201Y/V can be accessed as described above with READ CC or WRITE cycles. Should the supply voltage decay, the M48T201Y/V will automatically deselect, write protecting itself (and any external SRAM) when V (max) and V (min). This is accomplished by internally inhibiting access to the clock PFD registers via the E signal ...
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... SUPERVISOR. 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 M48T201Y/V and SRAMs to be “Don't care” once V falls below V ...
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... The oscillator may be stopped at any time. If the device is going to spend a significant amount of time on the shelf, the oscillator can be turned off to minimize current drain on the battery. The STOP bit is located at bit D7 within the seconds register (7FFF9h). Setting '1' stops the oscillator. When reset to a '0,' the M48T201Y/V oscillator starts within one second. ® ...
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... BMB1 BMB0 ABE Al.10M Alarm month Al. 10 date Alarm date Al. 10 hours Alarm hours Alarm minutes Alarm seconds 100 years 0 BL RS3 RS2 M48T201Y, M48T201V Function/range BCD format D1 D0 Year Year Month Date Day Day Hours Minutes Seconds Control RB1 RB0 Watchdog Al ...
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... It can also be programmed to go off while the M48T201Y the battery backup to serve as a system wake-up call. Bits RPT5-RPT1 put the alarm in the repeat mode of operation. ...
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... Note: Accuracy of timer is within ± the selected resolution. If the processor does not reset the timer within the specified period, the M48T201Y/V sets the WDF (watchdog flag) and generates a watchdog interrupt or a microprocessor reset. WDF is reset by reading the flag register (address 7FFF0h). ...
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... The user must transition the address (or toggle chip enable) to see the flag bit change. 3.7 Square wave output The M48T201Y/V offers the user a programmable square wave function which is output on the SQW pin. RS3-RS0 bits located in 7FFF0h establish the square wave output frequency. These frequencies are listed in completed, the SQW pin can be turned on and off under software control with the square wave enable bit (SQWE) located in register 7FFF6h ...
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... Calibrating the clock The M48T201Y/V is driven by a quartz controlled oscillator with a nominal frequency of 32,768 Hz. The devices are factory calibrated at 25°C and tested for accuracy. Clock accuracy will not exceed ±35 ppm (parts per million) oscillator frequency error at 25°C, which equates to about ± ...
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... Two methods are available for ascertaining how much calibration a given M48T201Y/V may require. The first involves setting the clock, letting it run for a month and comparing known accurate reference and recording deviation over a fixed period of time ...
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... CALIBRATION 3.11 Battery low warning The M48T201Y/V automatically performs battery voltage monitoring upon power-up and at factory-programmed time intervals of approximately 24 hours. The battery low (BL) bit, bit D4 of flags register 7FFF0h, will be asserted if the battery voltage is found to be less than approximately 2.5 V. The BL bit will remain asserted until completion of battery replacement and subsequent battery low monitoring tests, either during the next power-up sequence or the next scheduled 24-hour interval ...
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... Note: This will cause the clock to lose time during the interval the battery/crystal is removed. The M48T201Y/V only monitors the battery when a nominal V Thus applications which require extensive durations in the battery backup mode should be powered-up periodically (at least once every few months) in order for this technique to be beneficial ...
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... Schottky diode 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount. Figure 12. Supply voltage protection 26/37 bus. These transients can be reduced that drive it to values below (cathode connected 0.1 F DEVICE V SS M48T201Y, M48T201V bus. The energy stored in the by as much anode AI00605 ...
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... M48T201Y, M48T201V 4 Maximum ratings 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 ...
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... Effective capacitance measured with power supply sampled only, not 100% tested 25° MHz. 3. Outputs deselected. 28/37 conditions. Designers should check that the operating ) L DEVICE UNDER TEST 100pF C L includes JIG capacitance (1)(2) Parameter Input capacitance Input/output capacitance M48T201Y, M48T201V M48T201Y M48T201V 4.5 to 5.5 3 100 1.5 1.5 645 1 ...
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... M48T201Y, M48T201V Table 13. DC characteristics Sym Parameter (2) I Input leakage current LI Output leakage ( current I Supply current CC Supply current I CC1 (standby) TTL Supply current I CC2 (standby) CMOS Battery current OSC ON I BAT Battery current OSC OFF V Input low voltage IL V Input high voltage ...
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... V rise time CC rise time 70° 4 3.0 to 3.6 V (except where noted may result in deselection/write protection not occurring until 200 µs after F may cause corruption of RAM data. FB M48T201Y, M48T201V tR tRB tREC DON'T CARE VALID HIGH-Z VALID Min Max 300 10 150 ...
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... M48T201Y, M48T201V 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Figure 15. SOH44 – 44-lead plastic small outline, SNAPHAT Note: Drawing is not to scale ...
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... Typ Min Max 9.78 6.73 7.24 6.48 6.99 0.38 0.46 0.56 21.21 21.84 14.22 14.99 15.55 15.95 3.20 3.61 2.03 2.29 M48T201Y, M48T201V SHTK-A inches Typ Min 0.265 0.255 0.018 0.835 0.560 0.612 0.126 0.080 A2 Max 0.385 0.285 0.275 ...
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... M48T201Y, M48T201V Figure 17. SH – 4-pin SNAPHAT Note: Drawing is not to scale. Table 17. SH – 4-pin SNAPHAT data Symb Typ ® housing for 120 mAh battery & crystal, pack. outline ® housing for 120 mAh battery & crystal, pack. mech. mm Min Max Typ 10 ...
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... Ordering information scheme Example: Device type M48T Supply and write protect voltage 201Y = V = 4 201V = V = 3 Speed – (for M48T201Y) – (for M48T201V) Package ( SOH44 Temperature range 70°C Shipping method for SOIC blank = tubes (not for new design - use E) ® ECOPACK package, tubes ® ...
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... M48T201Y, M48T201V 8 Environmental information Figure 18. Recycling symbols This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry) button cell battery fully encapsulated in the final product. Recycle or dispose of batteries in accordance with the battery manufacturer's instructions and local/national disposal and recycling regulations. Please refer to the following web site address for additional information regarding compliance statements and waste recycling www.st.com/rtc, then select " ...
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... Reformatted; added lead-free second level interconnect information 5 to cover page and Section 6: Package mechanical Table 10. 6 Updated shipping method in Updated Table 10, text in 7 added Section 8: Environmental M48T201Y, M48T201V Changes (Table 10, 13 14) 14) 3) (Table (Table 10) (Table 13) (Table 13) data; updated Table 18 ...
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... M48T201Y, M48T201V 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 herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...