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DS17285S-5/T&R

更新时间： 2024-01-22 21:56:57

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 Clock, Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, SOP-24

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DS17285S-5/T&R 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SO-24	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	10 weeks
风险等级：	5.1	Is Samacsys：	N
最大时钟频率：	0.032 MHz	外部数据总线宽度：	8
信息访问方法：	PARALLEL, MUXED BUS	中断能力：	Y
JESD-30 代码：	R-PDSO-G24	JESD-609代码：	e3
长度：	17.9 mm	湿度敏感等级：	1
端子数量：	24	计时器数量：	1
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP24,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	2.68 mm	子类别：	Timer or RTC
最大供电电压：	5.5 V	最小供电电压：	4.5 V
标称供电电压：	5 V	表面贴装：	YES
技术：	CMOS	温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
最短时间：	SECONDS	处于峰值回流温度下的最长时间：	NOT SPECIFIED
易失性：	YES	宽度：	7.5 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

DS17285S-5/T&R 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.

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