DS17485E-5+

更新时间： 2024-11-23 03:32:39

品牌	Logo	应用领域
美信 - MAXIM		时钟
页数	文件大小	规格书
30页	320K
描述
Real-Time Clocks

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数据手册
替代型号

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DS17485E-5+ 数据手册

Rev 0; 4/06

Real-Time Clocks

General Description

Features

The DS17285, DS17485, DS17885, DS17287, DS17487,

and DS17887 real-time clocks (RTCs) are designed to be

successors to the industry-standard DS12885 and

DS12887. The DS17285, DS17485, and DS17885 (here-

after referred to as the DS17x85) provide a real-time

clock/calendar, one time-of-day alarm, three maskable

interrupts with a common interrupt output, a programma-

ble square wave, and 114 bytes of battery-backed NV

SRAM. The DS17x85 also incorporates a number of

enhanced functions including a silicon serial number,

power-on/off control circuitry, and 2k, 4k, or 8kbytes of

battery-backed NV SRAM. The DS17287, DS17487, and

DS17887 (hereafter referred to as the DS17x87) integrate

a quartz crystal and lithium energy source into a 24-pin

encapsulated DIP package. The DS17x85 and DS17x87

power-control circuitry allows the system to be powered

on by an external stimulus such as a keyboard or by a

time-and-date (wake-up) alarm. The PWR output pin is

triggered by one or either of these events, and is used to

turn on an external power supply. The PWR pin is under

software control, so that when a task is complete, the sys-

tem power can then be shut down.

♦ Incorporates Industry-Standard DS12887 PC

Clock Plus Enhanced Functions

♦ RTC Counts Seconds, Minutes, Hours, Day, Date,

Month, and Year with Leap Year Compensation

Through 2099

♦ Optional +3.0V or +5.0V Operation

♦ SMI Recovery Stack

♦ 64-Bit Silicon Serial Number

♦ Power-Control Circuitry Supports System Power-

On from Date/Time Alarm or Key Closure

♦ Crystal Select Bit Allows Operation with 6pF or

12.5pF Crystal

♦ 12-Hour or 24-Hour Clock with AM and PM in

12-Hour Mode

♦ 114 Bytes of General-Purpose, Battery-Backed NV

SRAM

♦ Extended Battery-Backed NV SRAM

2048 Bytes (DS17285/DS17287)

4096 Bytes (DS17485/DS17487)

8192 Bytes (DS17885/DS17887)

For all devices, the date at the end of the month is auto-

matically adjusted for months with fewer than 31 days,

including correction for leap years. It also operates in

either 24-hour or 12-hour format with an AM/PM indicator.

A precision temperature-compensated circuit monitors

♦ RAM Clear Function

the status of V . If a primary power failure is detected,

♦ Interrupt Output with Six Independently Maskable

the device automatically switches to a backup supply. A

Interrupt Flags

lithium coin cell battery can be connected to the V

BAT

♦ Time-of-Day Alarm Once per Second to Once per

input pin on the DS17x85 to maintain time and date oper-

ation when primary power is absent. The DS17x85 and

Day

DS17x87 include a V

input used to power auxiliary

BAUX

♦ End of Clock Update Cycle Flag

functions such as PWR control. The device is accessed

♦ Programmable Square-Wave Output

♦ Automatic Power-Fail Detect and Switch Circuitry

through a multiplexed byte-wide interface.

Applications

♦ Available in PDIP, SO, or TSOP Package

Embedded Systems

Utility Meters

(DS17285, DS17485, DS17885)

♦ Optional Encapsulated DIP (EDIP) Package with

Integrated Crystal and Battery (DS17287,

DS17487, DS17887)

Security Systems

Network Hubs, Bridges, and Routers

♦ Optional Industrial Temperature Range Available

♦ Underwriters Laboratory (UL) Recognized

Ordering Information, Pin Configurations, and Typical

Operating Circuit appear at end of data sheet.

______________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...30

中文翻译

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DS17485E-5+ 替代型号

型号	品牌	替代类型	描述	数据表
DS17485E-5	MAXIM	完全替代	Real-Time Clocks

与DS17485E-5+相关器件

型号	品牌	获取价格	描述	数据表
DS17485EN-3	DALLAS	获取价格	3V/5V Real-Time Clock
DS17485EN-5	DALLAS	获取价格	3V/5V Real-Time Clock
DS17485N-3	DALLAS	获取价格	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDIP24, DIP-24
DS17485N-5	DALLAS	获取价格	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDIP24, DIP-24
DS17485S-3	MAXIM	获取价格	Real-Time Clocks
DS17485S-3	DALLAS	获取价格	3V/5V Real-Time Clock
DS17485S-3/T&R	MAXIM	获取价格	暂无描述
DS17485S-3+	MAXIM	获取价格	Real-Time Clocks
DS17485S-3+T&R	MAXIM	获取价格	Real Time Clock, Non-Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, ROHS COMPLIANT, SOIC-
DS17485S-5	DALLAS	获取价格	3V/5V Real-Time Clock

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