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DS12885Q+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS12885Q+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 22 page Real-Time Clocks 6 _____________________________________________________________________ POWER-UP/POWER-DOWN CHARACTERISTICS (TA = -40°C to +85°C) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Recovery at Power-Up tRPU 20 200 ms VCC Fall Time; VPF(MAX) to VPF(MIN) tF 300 µs VCC Rise Time; VPF(MIN) to VPF(MAX) tR 0µs CAPACITANCE (TA = +25°C) (Note 9) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Capacitance on All Input Pins Except X1 and X2 CIN 5pF Capacitance on IRQ, SQW, and DQ Pins CIO 7pF DATA RETENTION (TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Expected Data Retention tDR 10 years AC TEST CONDITIONS PARAMETER TEST CONDITIONS Input Pulse Levels 0 to 3.0V Output Load Including Scope and Jig 50pF + 1TTL Gate Input and Output Timing Measurement Reference Levels Input/Output: VIL maximum and VIH minimum Input-Pulse Rise and Fall Times 5ns WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data. Note 1: RTC modules can be successfully processed through conventional wave-soldering techniques as long as temperature exposure to the lithium energy source contained within does not exceed +85°C. However, post-solder cleaning with water- washing techniques is acceptable, provided that ultrasonic vibrations are not used to prevent crystal damage. Note 2: Limits at -40°C are guaranteed by design and not production tested. Note 3: All voltages are referenced to ground. Note 4: All outputs are open. Note 5: Specified with CS = DS = R/W = RESET = VCC; MOT, AS, AD0–AD7 = 0; VBACKUP open. Note 6: Applies to the AD0 to AD7 pins, the IRQ pin, and the SQW pin when each is in a high-impedance state. Note 7: The MOT pin has an internal 20k Ω pulldown. Note 8: Measured with a 32.768kHz crystal attached to X1 and X2. Note 9: Guaranteed by design. Not production tested. Note 10: Measured with a 50pF capacitance load. |
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