M48T02-150PC1TR STMICROELECTRONICS [STMicroelectronics], M48T02-150PC1TR Datasheet
M48T02-150PC1TR
Related parts for M48T02-150PC1TR
M48T02-150PC1TR Summary of contents
Page 1
... HOURS, MINUTES, and SECONDS TYPICAL CLOCK ACCURACY OF ±1 MINUTE A MONTH, AT 25°C SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGES (V = Power-fail Deselect Voltage): PFD – M48T02 4.75 to 5.5V CC 4.5V V 4.75V PFD – M48T12 4.5 to 5. ...
Page 2
... M48T02, M48T12 TABLE OF CONTENTS SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 3. DIP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 MAXIMUM RATING Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 DC AND AC PARAMETERS Table 3. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 5. AC Testing Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 4. Capacitance Table 5. DC Characteristics OPERATION MODES ...
Page 3
... RAM and real time clock which is pin and functional compatible with the DS1642. A special 24-pin, 600mil DIP CAPHAT™ package houses the M48T02/12 silicon with a quartz crystal and a long life lithium button cell to form a highly integrated battery backed-up memory and real time clock solution ...
Page 4
... M48T02, M48T12 Figure 4. Block Diagram OSCILLATOR AND 32,768 Hz CRYSTAL LITHIUM CELL VOLTAGE SENSE 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 ...
Page 5
... M48T02 4. 100 1.5 5V 1.8k OUT 100pF AI01019 (1,2) Parameter M48T02, M48T12 M48T12 Unit 4 °C 100 1.5 V Min Max Unit 10 ...
Page 6
... The information can be accessed by the user in the same manner as any other location in the static memory array. The M48T02/12 also has its own Power-fail Detect circuit. The control circuitry constantly monitors the single 5V supply for an out of tolerance condi- tion ...
Page 7
... READ Mode The M48T02/ the READ Mode whenever W (WRITE Enable) is high and E (Chip Enable) is low. The device architecture allows ripple-through access of data from eight of 16,384 locations in the static storage array. Thus, the unique address specified by the 11 Address Inputs defines which one of the 2,048 bytes of data accessed ...
Page 8
... M48T02, M48T12 WRITE Mode The M48T02/ the WRITE Mode whenever W and E are active. The start of a WRITE is refer- enced from the latter occurring falling edge WRITE is terminated by the earlier rising edge The addresses must be held valid throughout the cycle ...
Page 9
... Address Valid to Chip Enable High AVEH t WRITE Enable High to Output Transition WHQX Note: 1. Valid for Ambient Operating Temperature: T (1) Parameter Min = 0 to 70° 4.75 to 5.5V or 4.5 to 5.5V (except where noted M48T02, M48T12 M48T02/M48T12 –70 –150 –200 Max Min Max Min 70 150 200 0 ...
Page 10
... PFD assured the memory will write protected state, provided the V fall time is not less than t CC The M48T02/12 may respond to transient noise spikes on V that reach into the deselect window CC during the time the device is sampling V fore, decoupling of the power supply lines is rec- ommended ...
Page 11
... V = 4.75 to 5.5V or 4.5 to 5.5V (except where noted may cause corruption of RAM data. FB (1,2) M48T02 M48T12 . = 0 to 70° 4.75 to 5.5V or 4.5 to 5.5V (except where noted M48T02, M48T12 tR tRB tREC DON'T CARE NOTE RECOGNIZED HIGH-Z VALID (PER CONTROL INPUT) rises past V (min). Some systems CC PFD ...
Page 12
... M48T02, M48T12 CLOCK OPERATIONS Reading the Clock Updates to the TIMEKEEPER be halted before clock data is read to prevent reading data in transition. The BiPORT™ TIME- KEEPER cells in the RAM array are only data reg- isters and not the actual clock counters, so updating the registers can be halted without dis- turbing the clock itself ...
Page 13
... Bit is the MSB of the seconds register. Setting '1' stops the oscillator. The M48T02/12 is shipped from STMicroelectronics with the STOP Bit set to a '1.' When reset to a '0,' the M48T02/12 oscillator starts within one second. Calibrating the Clock The M48T02/12 is driven by a quartz-controlled oscillator with a nominal frequency of 32,768 Hz ...
Page 14
... M48T02, M48T12 Figure 11. Crystal Accuracy Across Temperature ppm 20 0 -20 -40 -60 -80 -100 0 5 Figure 12. Clock Calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION 14/ -0.038 ppm 10 AI02124 AI00594B ...
Page 15
... V connected anode 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount. Figure 13. Supply Voltage Protection bus. The energy to V (cathode Schottky diode SS M48T02, M48T12 0.1 F DEVICE V SS AI02169 15/19 ...
Page 16
... M48T02, M48T12 PACKAGE MECHANICAL INFORMATION Figure 14. PCDIP24 – 24-pin Plastic DIP, battery CAPHAT, Package Outline Note: Drawing is not to scale. Table 12. PCDIP24 – 24-pin Plastic DIP, battery CAPHAT, Package Mechanical Data Symb Typ 16/ ...
Page 17
... V = 4.5 to 5.5V 4.2 to 4.5V CC PFD Speed –70 = 100ns (M48T02/12) –150 = 150ns (M48T02/12) –200 = 200ns (M48T02/12) Package PC = PCDIP24 Temperature Range 70°C Shipping Method for SOIC blank = Tubes TR = Tape & Reel For a list of available options (e.g., Speed, Package) or for further information on any aspect of this device, please contact the ST Sales Office nearest you ...
Page 18
... M48T02, M48T12 REVISION HISTORY Table 14. Document Revision History Date Rev. # July 2000 1.0 First issue t change (Table 9) 13-Jul-00 1.1 REC 07-May-01 2.0 Reformatted; temp. / voltage info. added to tables (Tables 10) 14-May-01 2.1 Note added to Clock Calibration section; table footnote correction (Table 6) 16-Jul-01 2.2 Basic formatting / content changes (Figure 1, Tables 4, 5, 10) 20-May-02 2 ...
Page 19
... Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. The ST logo is registered trademark of STMicroelectronics All other names are the property of their respective owners. © 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES www.st.com M48T02, M48T12 19/19 ...