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FM3808-70-T Datasheet(PDF) 7 Page - Ramtron International Corporation |
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FM3808-70-T Datasheet(HTML) 7 Page - Ramtron International Corporation |
7 / 27 page N O T R EC O M M EN D ED FO R N EW D ES IG N S La st Ti m e B uy : S ept . 200 6 N o Di re ct Re pl ac em en t Al te rn at e So lu tio n: FM 18 08 +F M 40 05 FM3808 Rev. 1.3 (EOL) Feb. 2006 Page 7 of 27 system power fails, the VDD voltage will drop. When it crosses the voltage on the VBAK supply pin, the clock/calendar power will switch to the backup power supply VBAK. The supervisor function, described below, controls the switchover process as part of a more complete power management circuit. The following functions are powered from the backup power source when VDD < VBAK (backup mode) : • Clock/calendar core • Alarm interrupt/comparator • INT pin (determined by ABE & AIE bits); active low only • Flags connected to related functions The following functions are not powered and are disabled when VDD < VLO : • User interface • Watchdog timer • Power monitor & band-gap (V DD < ≈ 2.0V) • Flags connected to related functions • All FRAM access & updates • Calibration operation • INT pin if programmed as active-high 32.768 kHz crystal Oscillator Clock Divider Update Logic 32 Hz 512 Hz W R Seconds 7 bits Minutes 7 bits Hours 6 bits Date 6 bits Months 5 bits Years 8 bits CF Days 3 bits User Interface Registers 1 Hz Figure 2. Real-Time Clock Core Block Diagram |
Similar Part No. - FM3808-70-T |
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Similar Description - FM3808-70-T |
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