M48T59-70PC1 STMicroelectronics, M48T59-70PC1 Datasheet
M48T59-70PC1
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M48T59-70PC1 Summary of contents
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... Frequency test output for real-time clock software calibration ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages (V = Power-fail deselect voltage): PFD – M48T59 4. 4.75 V PFD – M48T59Y 4 ...
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Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of tables Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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... The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real-time clock solution. The M48T59/Y non-volatile pin and function equivalent to any JEDEC standard SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special write timing or limitations on the number of writes that can be performed ...
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... Supply voltage Ground RST 1 28 A12 M48T59Y M48T59V DQ0 11 18 DQ1 12 17 DQ2 AI01382E RST A12 IRQ/ A11 M48T59 A10 M48T59Y DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 DQ3 AI01381D IRQ/ A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3 ...
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Figure 4. Block diagram OSCILLATOR AND CLOCK CHAIN 32,768 Hz CRYSTAL LITHIUM CELL VOLTAGE SENSE SWITCHING V CC IRQ/FT POWER V PFD AND CIRCUITRY RST BiPORT SRAM ARRAY A0-A12 DQ0-DQ7 8176 x 8 SRAM ARRAY E W ...
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... SO 2.1 Read mode The M48T59/Y the READ Mode whenever W (WRITE Enable) is high and E (Chip Enable) is low. The unique address specified by the 13 address inputs defines which one of the 8,192 bytes of data accessed. Valid data will be available at the Data I/O pins within Address Access time (t that the E and G access times are also satisfied ...
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... Address Access. AXQX tAVAV VALID tAVQV tELQV tELQX tGLQV tGLQX (1) Parameter = 0 to 70° 4.5 to 5.5 V, 4. 3.0 to 3.6 V (except where A CC 22). AVQV tAXQX tEHQZ tGHQZ VALID AI01385 M48T59/Y/V –70 Min Max Unit ...
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... Write mode The M48T59/Y the WRITE Mode whenever W and E are low. The start of a WRITE is referenced from the latter occurring falling edge WRITE is terminated by the earlier rising edge The addresses must be held valid throughout the cycle must return high for a minimum of t prior to the initiation of another READ or WRITE cycle ...
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... When V drops below V CC preserves data and powers the clock. The internal button cell will maintain data in the M48T59/Y/V for an accumulated period of at least 7 years when V system power returns and V supply is switched to external V (max). For more information on Battery Storage Life refer to the Application Note AN1012. ...
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... The STOP Bit is the MSB of the seconds register. Setting '1' stops the oscillator. The M48T59/Y/V in the DIP package is shipped from STMicroelectronics with the STOP Bit set to a '1.' When reset to a '0,' the M48T59/Y/V oscillator starts within one second. Note not necessary to set the WRITE Bit when setting or resetting the FREQUENCY TEST Bit (FT), the STOP Bit (ST) or the CENTURY ENABLE Bit (CEB) ...
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Table 5. Register map Address 1FFFh 10 Years 1FFEh 1FFDh date 1FFCh 0 FT CEB 1FFBh hours 1FFAh 0 10 minutes 1FF9h ST 10 seconds 1FF8h W R ...
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... Hz. The devices are tested not to exceed 35 PPM (parts per million) oscillator frequency error at 25°C, which equates to about ±1.53 minutes per month. With the calibration bits properly set, the accuracy of each M48T59/Y/V improves to better than +1/– 2 PPM at 25°C. The oscillation rate of any crystal changes with temperature (see Most clock chips compensate for crystal frequency and temperature shift error with cumbersome “ ...
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... Registers 1FF5h-1FF2h contain the alarm settings. The alarm can be configured to go off at a prescribed time on a specific day of the month or repeat every month, day, hour, minute, or second. It can also be programmed to go off while the M48T59/Y the battery back-up mode of operation to serve as a system wake-up call. ...
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... The ABE and AFE bits are reset during power-up, therefore an alarm generated during power-up will only set AF. The user can read the Flag Register at system boot-up to determine if an alarm was generated while the M48T59/Y/V was in the deselect mode during power-down. ...
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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 M48T59/Y/V sets the WDF (Watchdog Flag) and generates a watchdog interrupt or a microprocessor reset. WDF is reset by reading the Flags Register (Address 1FF0h). ...
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... Programmable interrupts The M48T59/Y/V provides two programmable interrupts; an alarm and a watchdog. When an interrupt condition occurs, the M48T59/Y/V sets the appropriate flag bit in the Flag Register 1FF0h. The interrupt enable bits in (AFE and ABE) in 1FF6h and the Watchdog Steering (WDS) Bit in 1FF7h allow the interrupt to activate the IRQ/FT pin. ...
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Century bit Bit D5 and D4 of Clock Register 1FFCh contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or from ...
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Figure 12. Supply voltage protection 20/ 0.1 F DEVICE V SS AI02169 ...
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... Caution: Negative undershoots below –0.3 V are not allowed on any pin while in the Battery Back-up mode. Caution: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets. Parameter off, oscillator off) CC M48T59/M48T59Y M48T59V Value Unit °C – °C 260 °C –0 – ...
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... Input rise and fall times Input pulse voltages Input and output timing ref. voltages Note: Output Hi-Z is defined as the point where data is no longer driven. Figure 13. AC measurement load circuit 1. 50pF for M48T59V. Note: Excluding open-drain output pins Table 10. Capacitance Symbol ...
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... OUT CC Outputs open – 0 –0 – 70° 4.5 to 5.5 V, 4. 3.0 to 3.6 V (except where A CC tFB tDR DON'T CARE HIGH-Z M48T59V Unit Max Min Max ±1 ±1 ±1 ± 0.8 –0 0.4 0.4 0.4 0.4 2.4 tR tRB ...
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... (min) fall time of less than t may result in deselection/write protection not occurring F passes V (min). PFD may cause corruption of RAM data. FB (1)(2) Parameter M48T59 M48T59Y M48T59V M48T59/Y M48T59V = 0 to 70° Min Max Unit 0 300 200 = 4.5 to 5.5 V, 4. 3.0 to 3.6 V ...
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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 ...
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Figure 16. SOH28 – 28-lead plastic small outline, battery SNAPHAT, package outline B Note: Drawing is not to scale. Table 15. SOH28 – 28-lead plastic small outline, battery SNAPHAT, pack. mech. data Symb Typ ...
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Figure 17. SH – 4-pin SNAPHAT housing for 48mAh battery & crystal, package outline Note: Drawing is not to scale. Table 16. SH – 4-pin SNAPHAT housing for 48mAh battery & crystal, package mech. data Symb Typ ...
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Figure 18. SH – 4-pin SNAPHAT housing for 120mAh battery & crystal, package outline Note: Drawing is not to scale. Table 17. SH – 4-pin SNAPHAT housing for 120mAh battery & crystal, package mech. data Symb Typ ...
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... F = Lead-free package (ECOPACK For PCDIP28: blank = tubes 1. The M48T59 part is offered with the PCDIP28 (e.g., CAPHAT™) package only. 2. Contact local ST sales office for availability of 3.3 V version. 3. The SOIC package (SOH28) requires the SNAPHAT separately under the part number “M4TXX-BR12SH” in plastic tube or “M4TXX-BR12SHTR” in tape & ...
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Table 19. SNAPHAT battery table Part number M4T28-BR12SH1 M4T32-BR12SHx 30/32 Description Lithium battery (48mAh) SNAPHAT Lithium battery (120mAh) SNAPHAT Package SH SH ...
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Revision history Table 20. Document revision history Date Revision Oct-1999 22-Mar-2000 13-Jul-2000 14-May-2001 31-Jul-2001 06-Aug-2001 20-May-2002 07-Aug-2002 01-Apr-2003 02-Apr-2004 25-Nov-2004 01-Apr-2008 1.0 First Issue 1.1 Century Bit Paragraph added; t 2.0 From Preliminary Data to Data Sheet Reformatted, Ind. ...
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... 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. ...