m48t128y STMicroelectronics, m48t128y Datasheet
m48t128y
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m48t128y Summary of contents
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... REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY, AND CRYSTAL BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, AND SECONDS AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION WRITE PROTECT VOLTAGES (V = Power-fail Deselect Voltage): PFD – M48T128Y 4.5 to 5.5V CC 4.1V V 4.5V PFD – M48T128V 3.0 to 3. ...
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... M48T128Y, M48T128V* TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. 32-pin PMDIP Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 3. DIP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 OPERATION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 2. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 READ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 5. READ Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. READ Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 WRITE Mode Figure 6 ...
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... PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 13.PMDIP32 – 32-pin Plastic Module DIP, Package Outline . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 12. PMDIP32 – 32-pin Plastic Module DIP, Package Mechanical Data . . . . . . . . . . . . . . . . 19 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 13. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 REVISION HISTORY Table 14. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 M48T128Y, M48T128V* 3/22 ...
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... SUMMARY DESCRIPTION The M48T128Y/V TIMEKEEPER 128Kb x 8 non-volatile static RAM and real time clock. The special DIP package provides a fully in- tegrated battery back-up memory and real time clock solution. The M48T128Y/V directly replaces industry standard 128Kb x 8 SRAM. Figure 2. Logic Diagram ...
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... Figure 4. Block Diagram OSCILLATOR AND 32,768 Hz CRYSTAL LITHIUM CELL VOLTAGE SENSE CLOCK CHAIN POWER V PFD AND SWITCHING CIRCUITRY V CC M48T128Y, M48T128V TIMEKEEPER REGISTERS A0-A16 DQ0-DQ7 131,064 x 8 SRAM ARRAY AI01804 5/22 ...
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... The information can be accessed by the user in the same manner as any other location in the static memory array. The M48T128Y/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 ...
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... READ Mode The M48T128Y the READ Mode whenever W (WRITE Enable) is high and E (Chip Enable) is low. The unique address specified by the 17 Ad- dress Inputs defines which one of the 131,072 bytes of data accessed. Valid data will be available at the Data I/O pins within t ...
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... M48T128Y, M48T128V* WRITE Mode The M48T128Y the WRITE Mode whenever W (WRITE Enable) and E (Chip Enable) are low state after the address inputs are stable. The start of a WRITE is referenced from the latter occurring falling edge WRITE is termi- nated by the earlier rising edge The ad- dresses must be held valid throughout the cycle ...
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... Note: 1. Valid for Ambient Operating Temperature 5pF goes low simultaneously with W going low, the outputs remain in the high impedance state. (1) Parameter = 0 to 70° 4.5 to 5.5V or 3.0 to 3.6V (except where noted M48T128Y, M48T128V* M48T128Y M48T128V –70 –85 Min Max Min Max 70 85 ...
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... PFD PFD switches power to the internal battery, preserving data and powering the clock. The internal energy source will maintain data in the M48T128Y/V for an accumulated period of at least 10 years at room temperature. As system power rises above V the battery is disconnected, and the power supply is switched to external V ...
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... The STOP Bit is located at Bit D7 within 1FFF9h. Setting '1' stops the oscillator. The M48T128Y/V is shipped from STMicroelectronics with the STOP Bit set to a '1.' When reset to a '0,' the M48T128Y/ V oscillator starts after one second. Data D4 D3 ...
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... M48T128Y, M48T128V* Calibrating the Clock The M48T128Y/V is driven by a quartz controlled oscillator with a nominal frequency of 32,768Hz. The devices are factory calibrated at 25°C and tested for accuracy. Clock accuracy will not ex- ceed 35 ppm (parts per million) oscillator frequen- cy error at 25°C, which equates to about ±1.53 minutes per month ...
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... Figure 8. Crystal Accuracy Across Temperature ppm 20 0 -20 -40 -60 -80 -100 0 5 Figure 9. Clock Calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION F = -0.038 ppm 10 M48T128Y, M48T128V AI02124 AI00594B 13/22 ...
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... M48T128Y, M48T128V* V Noise And Negative Going Transients CC I transients, including those produced by output CC switching, can produce voltage fluctuations, re- sulting in spikes on the V bus. These transients CC can be reduced if capacitors are used to store en- ergy which stabilizes the V CC stored in the bypass capacitors will be released as low going spikes are generated or energy will be absorbed when overshoots occur ...
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... Exposure to Absolute Maximum Rat- ing conditions for extended periods may affect de- vice reliability. STMicroelectronics SURE Program and other rel- evant quality documents. Parameter Off, Oscillator Off) CC M48T128Y M48T128V M48T128Y, M48T128V* Refer also to the Value Unit °C – °C 260 ° ...
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... M48T128Y, M48T128V* DC AND AC PARAMETERS This section summarizes the operating and mea- surement 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 Measure- Table 7. Operating and AC Measurement Conditions Parameter Supply Voltage (V ...
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... OUT CC Outputs open – 0.2V CC –0.3 2 2.1mA –1mA 2 70° 4.5 to 5.5V or 3.0 to 3.6V (except where noted M48T128Y, M48T128V* M48T128V –85 Max Min Max ±2 ±2 ±2 ± 0.8 –0.3 0.4 + 0 0.4 0.4 2.2 Unit µA µ ...
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... M48T128Y, M48T128V* Figure 12. Power Down/Up Mode AC Waveforms PFD (max) V PFD (min INPUTS RECOGNIZED OUTPUTS VALID Table 10. Power Down/Up AC Characteristics Symbol (2) V (max PFD PFD F (3) V (min PFD (min PFD PFD (min ...
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... Min Max 9.27 9.52 0.38 – 0.43 0.59 0.20 0.33 42.42 43.18 18.03 18.80 2.29 2.79 34.29 41.91 14.99 16.00 3.05 3.81 1.91 2.79 32 M48T128Y, M48T128V PMDIP inches Typ Min Max 0.365 0.375 0.015 0.017 0.023 0.008 0.013 1.670 1.700 0.710 0.740 0.090 0.110 1.350 1.650 0.590 0.630 0.120 0.150 0.075 0.110 32 – 19/22 ...
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... M48T128Y, M48T128V* PART NUMBERING Table 13. Ordering Information Scheme Example: Device Type M48T Supply Voltage and Write Protect Voltage 128Y = V = 4.5 to 5.5V 4.1 to 4.5V CC PFD (1) 128V = V = 3.0 to 3.6V PFD Speed –70 = 70ns (128Y) –85 = 85ns (128V) Package PM = PMDIP32 Temperature Range 70°C Shipping Method for SOIC blank = Tubes TR = Tape & ...
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... Reformatted; temperature information added to tables (Table 10, 11) 09/21/01 2.1 Corrected speed grade in ordering information 05/23/02 2.2 Add countries to disclaimer; add marketing status 08/07/02 2.3 Refine marketing status text 28-Mar-03 3.0 v2.2 template applied; test condition updated (Table 11) 06-Aug-04 4.0 Reformatted; updated Register Map (Table 5) 22-Feb-05 5.0 IR reflow update (Table 6) M48T128Y, M48T128V* Revision Details 21/22 ...
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... M48T128Y, M48T128V* Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...