Datasheet > DS17285S-5

DS17285S-5

更新时间： 2024-09-22 22:23:59

品牌	Logo	应用领域
达拉斯 - DALLAS		时钟
页数	文件大小	规格书
38页	408K
描述
3V/5V Real-Time Clock

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DS17285S-5 数据手册

DS17285/DS17287

DS17285 ONLY

X1, X2 – Connections for a standard 32.768kHz quartz crystal. For greatest accuracy, the DS17285 must

be used with a crystal that has a specified load capacitance of either 6pF or 12.5pF. The crystal select

(CS) bit in extended-control register 4B is used to select operation with a 6pF or 12.5pF crystal. The

crystal is attached directly to the X1 and X2 pins. There is no need for external capacitors or resistors.

Note: X1 and X2 are very high-impedance nodes. It is recommended that they and the crystal be guard-

ringed with ground and that high frequency signals be kept away from the crystal area.

For more information about crystal selection and crystal layout considerations, refer to Application Note

58, “Crystal Considerations with Dallas Real-Time Clocks.” The DS17285 can also be driven by an

external 32.768kHz oscillator. In this configuration, the X1 pin is connected to the external oscillator

signal and the X2 pin is floated.

V_BAT– Battery input for any standard 3V lithium cell or other energy source. Battery voltage must be

held between 2.5V and 3.7V for proper operation. UL recognized to ensure against reverse charging

current when used in conjunction with a lithium battery. See “Conditions of Acceptability” at

www.maxim-ic.com/TechSupport/AQ/ntrl.htm.

POWER-DOWN/POWER-UP CONSIDERATIONS

The RTC function continues to operate and all of the RAM, time, calendar, and alarm memory locations

remain nonvolatile regardless of the level of the V_CCinput. When V_CCis applied to the

DS17285/DS17287 and reaches a level of greater than V_PF(power-fail trip point), the device becomes

accessible after t_REC, provided that the oscillator is running and the oscillator countdown chain is not in

reset (Register A). This time period allows the system to stabilize after power is applied.

The DS17285/DS17287 is available in either a 3V or a 5V device.

The 5V device is fully accessible and data can be written and read only when V_CCis greater than 4.5V.

When V_CCis below 4.5V, read and writes are inhibited. However, the timekeeping function continues

unaffected by the lower input voltage. As V_CCfalls below the greater of V_BATand V_BAUX, the RAM and

timekeeper are switched over to a lithium battery connected either to the V_BATpin or V_BAUXpin.

The 3V device is fully accessible and data can be written or read only when V_CCis greater than 2.7V.

When V_CCfalls below V_PF, access to the device is inhibited. If V_PFis less than V_BATand V_BAUX, the

power supply is switched from V_CCto the backup supply (the greater of _VBATand V_BAUX) when V_CCdrops

below V_PF. If V_PFis greater than V_BATand V_BAUX, the power supply is switched from V_CCto the backup

supply when V_CCdrops below the larger of V_BATand V_BAUX

When V_CCfalls below V_PF, the chip is write-protected. With the possible exception of the KS , PWR ,

RCLR , and SQW pins, all inputs are ignored and all outputs are in a high-impedance state.

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与DS17285S-5相关器件

型号	品牌	获取价格	描述	数据表
DS17285S-5/T&R	MAXIM	获取价格	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, SOP-24
DS17285S-5+	MAXIM	获取价格	Real-Time Clocks
DS17285S-5+T&R	MAXIM	获取价格	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDSO24, SO-24
DS17285SN-	MAXIM	获取价格	Real-Time Clocks
DS17285SN3	MAXIM	获取价格	Real-Time Clocks
DS17285SN-3	DALLAS	获取价格	3V/5V Real-Time Clock
DS17285SN-3+	MAXIM	获取价格	Real-Time Clocks
DS17285SN5	MAXIM	获取价格	Real-Time Clocks
DS17285SN-5	DALLAS	获取价格	3V/5V Real-Time Clock
DS17285SN-5+	MAXIM	获取价格	Real-Time Clocks

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