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M48T35AV-70PC1TR Datasheet(PDF) 9 Page - STMicroelectronics |
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M48T35AV-70PC1TR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 19 page 9/19 M48T35AY, M48T35AV Table 10. Write Mode AC Characteristics (TA = 0 to 70 °C or –40 to 85 °C; VCC = 4.5V to 5.5V or 3.0V to 3.6V) Note: 1. CL = 5pF. 2. If E goes low simultaneously with W going low, the outputs remain in the high impedance state. Symbol Parameter M48T35AY M48T35AV Unit -70 -100 Min Max Min Max tAVAV Write Cycle Time 70 100 ns tAVWL Address Valid to Write Enable Low 0 0 ns tAVEL Address Valid to Chip Enable Low 0 0 ns tWLWH Write Enable Pulse Width 50 80 ns tELEH Chip Enable Low to Chip Enable High 55 80 ns tWHAX Write Enable High to Address Transition 0 10 ns tEHAX Chip Enable High to Address Transition 0 10 ns tDVWH Input Valid to Write Enable High 30 50 ns tDVEH Input Valid to Chip Enable High 30 50 ns tWHDX Write Enable High to Input Transition 5 5 ns tEHDX Chip Enable High to Input Transition 5 5 ns tWLQZ (1, 2) Write Enable Low to Output Hi-Z 25 50 ns tAVWH Address Valid to Write Enable High 60 80 ns tAVEH Address Valid to Chip Enable High 60 80 ns tWHQX (1, 2) Write Enable High to Output Transition 5 10 ns Setting the Clock Bit D7 of the Control Register 7FF8h is the WRITE bit. Setting the WRITE bit to a '1', like the READ bit, halts updates to the TIMEKEEPER registers. The user can then load them with the correct day, date, and time data in 24 hour BCD format (see Table 11). Resetting the WRITE bit to a '0' then transfers the values of all time registers 7FF9h- 7FFFh to the actual TIMEKEEPER counters and allows normal operation to resume. The FT bit and the bits marked as '0' in Table 11 must be written to '0' to allow for normal TIMEKEEPER and RAM operation. After the WRITE bit is reset, the next clock update will occur within one second. See the Application Note AN923 "TIMEKEEPER rolling into the 21st century" on the for information on Century Rollover. Stopping and Starting the Oscillator 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 the MSB of the seconds register. Setting it to a '1' stops the oscillator. The M48T35AY/35AV is shipped from STMicroelectronics with the STOP bit set to a '1'. When reset to a '0', the M48T35AY/ 35AV oscillator starts within 1 second. |
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