DS17885EN-3 查看數據表（PDF） - Maxim Integrated
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DS17885EN-3 Datasheet PDF : 31 Pages
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DS17285/DS17287/
DS17485/DS17487/
DS17885/DS17887
Power-Up/Power-Down Characteristics
(TA = -40°C to +85°C) (Note 2)
PARAMETER
Recovery at Power-Up
VCC Fall Time, VPF(MAX) to
VPF(MIN)
VCC Fall Time, VPF(MAX) to
VPF(MIN)
SYMBOL
tREC (Note 9)
tF
tR
CONDITIONS
Data Retention (DS17x87 Only)
(TA = +25°C)
PARAMETER
Expected Data Retention
SYMBOL
tDR
(Note 9)
CONDITIONS
Capacitance
(TA = +25°C) (Note 10)
PARAMETER
Capacitance on All Input Pins
Except X1
Capacitance on IRQ, SQW, and
DQ0–DQ7 Pins
SYMBOL
CIN
(Note 10)
CIO
(Note 10)
CONDITIONS
Real-Time Clocks
MIN TYP MAX UNITS
20
150
ms
300
µs
0
µs
MIN TYP MAX UNITS
10
Years
MIN TYP MAX UNITS
12
pF
12
pF
AC Test Conditions
PARAMETER
Input Pulse Levels:
Output Load Including Scope and Jig:
Input and Output Timing Measurement Reference Levels:
Input Pulse Rise and Fall Times:
CONDITIONS
0 to 3.0V
50pF + 1TTL Gate
Input/Output: VIL max and VIH min
5ns
WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode can 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 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.
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