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DS12C887

更新时间： 2024-09-21 04:39:07
品牌 Logo 应用领域
美信 - MAXIM 外围集成电路双倍数据速率时钟
页数 文件大小 规格书
22页 259K
描述
Real-Time Clock

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中文翻译

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DS12C887 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete零件包装代码：DIP
包装说明：DIP, DIP24,.6针数：24
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8473.30.11.80风险等级：8.11
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-PDIP-T24JESD-609代码：e0
长度：33.782 mm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：DIP封装等效代码：DIP24,.6
封装形状：RECTANGULAR封装形式：IN-LINE
峰值回流温度（摄氏度）：NOT SPECIFIED电源：5 V
认证状态：Not Qualified座面最大高度：9.398 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：NO技术：CMOS
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：THROUGH-HOLE端子节距：2.54 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：NO
宽度：15.24 mmuPs/uCs/外围集成电路类型：TIMER, REAL TIME CLOCK
Base Number Matches：1

DS12C887 数据手册

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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  
V
. If a primary power failure is detected, the device  
CC  
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  
V
CC  
♦ Optional 28-Pin PLCC Surface Mount Package or  
X1  
AS  
X2  
V
CC  
32-Pin TQFP (DS12885)  
RESET  
RCLR  
♦ Optional Encapsulated DIP (EDIP) Package with  
Integrated Crystal and Battery (DS12887,  
DS12887A, DS12C887, DS12C887A)  
R/W  
DS  
DS83C520  
DS12885  
CS  
♦ Optional Industrial Temperature Range Available  
♦ Underwriters Laboratory (UL) Recognized  
AD(0–7)  
IRQ  
SQW  
V
BAT  
MOT  
GND  
Pin Configurations and Ordering Information appear at end of data sheet.  
______________________________________________ Maxim Integrated Products  
1
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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DS12C887 替代型号

型号 品牌 替代类型 描述 数据表
DS12C887+ MAXIM

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