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DS17487-5 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS17487-5 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 30 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 tREC (Note 9) 20 150 ms VCC Fall Time, VPF(MAX) to VPF(MIN) tF 300 µs VCC Fall Time, VPF(MAX) to VPF(MIN) tR 0µs DATA RETENTION (DS17x87 ONLY) (TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Expected Data Retention tDR (Note 9) 10 Years CAPACITANCE (TA = +25°C) (Note 10) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Capacitance on All Input Pins Except X1 CIN (Note 10) 12 pF Capacitance on IRQ, SQW, and DQ0–DQ7 Pins CIO (Note 10) 12 pF AC TEST CONDITIONS PARAMETER 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 max and VIH min Input Pulse Rise and Fall Times: 5ns 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 not used to prevent damage to the crystal. 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 = RD = WR = VCC, ALE, AD0–AD7 = 0. Note 6: Applies to the AD0–AD7 pins, IRQ, and SQW when each is in a high-impedance state. Note 7: Measured with a 32.768kHz crystal attached to X1 and X2. Note 8: Measured with a 50pF capacitance load plus 1TTL gate. Note 9: If the oscillator is disabled in software, or if the countdown chain is in reset, tREC is bypassed, and the part becomes immediately accessible. Note 10: Guaranteed by design. Not production tested. WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode can cause loss of data. |
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