DS17285-5+

更新时间： 2024-02-11 17:38:07

品牌	Logo	应用领域
美信 - MAXIM		时钟
页数	文件大小	规格书
31页	324K
描述
Real-Time Clocks

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数据手册

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DS17285-5+ 数据手册

Real-Time Clocks

POWER-UP/POWER-DOWN CHARACTERISTICS

(T = -40°C to +85°C) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Recovery at Power-Up

(Note 9)

150

REC

Fall Time, V

PF(MAX)

300

µs

PF(MIN)

Fall Time, V

PF(MIN)

PF(MAX)

DATA RETENTION (DS17x87 ONLY)

(T = +25°C)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Expected Data Retention

(Note 9)

Years

CAPACITANCE

(T = +25°C) (Note 10)

PARAMETER

SYMBOL

MIN

MAX

UNITS

Capacitance on All Input Pins

Except X1

(Note 10)

Capacitance on IRQ, SQW, and

DQ0–DQ7 Pins

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 Pulse Rise and Fall Times:

Input/Output: V max and V min

IL IH

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 = V , 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, t

is bypassed, and the part becomes

REC

immediately accessible.

245/DS187

Note 10: Guaranteed by design. Not production tested.

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