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DS12885QN+R

更新时间： 2024-01-13 05:38:43

品牌	Logo	应用领域
美信 - MAXIM		时钟
页数	文件大小	规格书
22页	259K
描述
Real-Time Clock

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技术参数
数据手册

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DS12885QN+R 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFP
包装说明：	TQFP, TQFP32,.35SQ,32	针数：	32
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8473.30.11.80	Factory Lead Time：	1 week
风险等级：	5.22	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：	S-PQFP-G32	JESD-609代码：	e3
长度：	7 mm	湿度敏感等级：	1
端子数量：	32	计时器数量：	1
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TQFP
封装等效代码：	TQFP32,.35SQ,32	封装形状：	SQUARE
封装形式：	FLATPACK, THIN PROFILE	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：	1.2 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：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.8 mm	端子位置：	QUAD
最短时间：	SECONDS	处于峰值回流温度下的最长时间：	30
易失性：	NO	宽度：	7 mm
uPs/uCs/外围集成电路类型：	TIMER, PROGRAMMABLE	Base Number Matches：	1

DS12885QN+R 数据手册

Rev 3; 2/07

Real-Time Clock

5/DS12C87A

General Description

Features

The DS12885, DS12887, and DS12C887 real-time

clocks (RTCs) are designed to be direct replacements

for the DS1285 and DS1287. The devices provide a

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

maskable interrupts with a common interrupt output, a

programmable square wave, and 114 bytes of battery-

backed static RAM (113 bytes in the DS12C887 and

DS12C887A). The DS12887 integrates a quartz crystal

and lithium energy source into a 24-pin encapsulated

DIP package. The DS12C887 adds a century byte at

address 32h. For all devices, the date at the end of the

month is automatically adjusted for months with fewer

than 31 days, including correction for leap years. The

devices also operate in either 24-hour or

12-hour format with an AM/PM indicator. A precision

temperature-compensated circuit monitors the status of

♦ Drop-In Replacement for IBM AT Computer

Clock/Calendar

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

Month, and Year with Leap Year Compensation

Through 2099

♦ Binary or BCD Time Representation

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

12-Hour Mode

♦ Daylight Saving Time Option

♦ Selectable Intel or Motorola Bus Timing

♦ Interfaced with Software as 128 RAM Locations

♦ 14 Bytes of Clock and Control Registers

. If a primary power failure is detected, the device

automatically switches to a backup supply. A lithium

coin-cell battery can be connected to the V input

♦ 114 Bytes of General-Purpose, Battery-Backed

RAM (113 Bytes in the DS12C887 and

DS12C887A)

BAT

pin on the DS12885 to maintain time and date operation

when primary power is absent. The device is accessed

through a multiplexed byte-wide interface, which sup-

ports both Intel and Motorola modes.

♦ RAM Clear Function (DS12885, DS12887A, and

DS12C887A)

Applications

♦ Interrupt Output with Three Independently

Embedded Systems

Utility Meters

Maskable Interrupt Flags

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

Security Systems

Per Day

Network Hubs, Bridges, and Routers

♦ Periodic Rates from 122μs to 500ms

♦ End-of-Clock Update Cycle Flag

Typical Operating Circuit

♦ Programmable Square-Wave Output

♦ Automatic Power-Fail Detect and Switch Circuitry

CRYSTAL

♦ Optional 28-Pin PLCC Surface Mount Package or

32-Pin TQFP (DS12885)

RESET

RCLR

♦ Optional Encapsulated DIP (EDIP) Package with

Integrated Crystal and Battery (DS12887,

DS12887A, DS12C887, DS12C887A)

R/W

DS83C520

DS12885

♦ Optional Industrial Temperature Range Available

♦ Underwriters Laboratory (UL) Recognized

AD(0–7)

IRQ

SQW

BAT

MOT

GND

Pin Configurations and Ordering Information 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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与DS12885QN+R相关器件

型号	品牌	获取价格	描述	数据表
DS12885QN+T	MAXIM	获取价格	Real-Time Clock
DS12885QN+T&	MAXIM	获取价格	Real-Time Clock
DS12885QN+T&R	MAXIM	获取价格	Programmable Timer, Non-Volatile, 1 Timer(s), CMOS, PQCC28, ROHS COMPLIANT, PLASTIC, LCC-2
DS12885QN+TR	MAXIM	获取价格	Real-Time Clocks
DS12885S	MAXIM	获取价格	Real-Time Clock
DS12885S	DALLAS	获取价格	Real-Time Clock
DS12885S	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO24, 0.300 INCH, SOIC-24
DS12885S/R	MAXIM	获取价格	Real-Time Clock
DS12885S/T	MAXIM	获取价格	Real-Time Clock
DS12885S/T&R	MAXIM	获取价格	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, SOIC-24

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