Datasheet > 微控制器和处理器 > 计时器或实时时钟> DS12885SN+

DS12885SN+

更新时间： 2024-01-30 21:07:59

品牌	Logo	应用领域
美信 - MAXIM		时钟
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描述
Real-Time Clocks

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数据手册
替代型号

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DS12885SN+ 数据手册

19-5213; Rev 4; 4/10

Real-Time Clocks

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 Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...22

中文翻译

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DS12885SN+ 替代型号

型号	品牌	替代类型	描述	数据表
DS12885S+T&R	MAXIM	完全替代	Programmable Timer, Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, ROHS COMPLIANT, SOP-24
DS12885S/T&R	MAXIM	完全替代	Real Time Clock, Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, SOIC-24
DS12885SN	MAXIM	完全替代	Real-Time Clock

与DS12885SN+相关器件

型号	品牌	获取价格	描述	数据表
DS12885SN+TR	MAXIM	获取价格	Timer or RTC, Non-Volatile, 1 Timer(s), CMOS, PDSO24, 0.300 INCH, ROHS COMPLIANT, SOIC-24
DS12885T	DALLAS	获取价格	Real-Time Clock
DS12885T	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PQFP32, 7 X 7 MM, 1 MM HEIGHT, TQFP-32
DS12885T	MAXIM	获取价格	Real-Time Clock
DS12885T/R	MAXIM	获取价格	Real-Time Clock
DS12885T/T	MAXIM	获取价格	Real-Time Clock
DS12885T/T&R	MAXIM	获取价格	Real Time Clock, Non-Volatile, 1 Timer(s), CMOS, PQFP32, 7 X 7 MM, 1 MM HEIGHT, TQFP-32
DS12885T/T&R	MAXIM	获取价格	Real-Time Clock
DS12885T/TR	DALLAS	获取价格	Real-Time Clock
DS12885T+	MAXIM	获取价格	Real-Time Clock

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