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DS12C887A PDF预览

DS12C887A

更新时间： 2024-09-20 21:55:19
品牌 Logo 应用领域
达拉斯 - DALLAS 计时器或实时时钟微控制器和处理器外围集成电路双倍数据速率
页数 文件大小 规格书
2页 85K
描述
Real-Time Clock

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中文翻译

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DS12C887A 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：PLASTIC, DIP MODULE, DMA-24Reach Compliance Code：unknown
风险等级：5.74Is Samacsys：N
外部数据总线宽度：8信息访问方法：PARALLEL, DIRECT ADDRESS/MUXED BUS
中断能力：YJESD-30 代码：R-XDMA-T24
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：UNSPECIFIED封装代码：DIP
封装等效代码：DIP24,.6封装形状：RECTANGULAR
封装形式：MICROELECTRONIC ASSEMBLY电源：5 V
认证状态：Not Qualified子类别：Timer or RTC
标称供电电压：5 V表面贴装：NO
技术：CMOS温度等级：COMMERCIAL
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUAL最短时间：SECONDS
易失性：NOuPs/uCs/外围集成电路类型：TIMER, REAL TIME CLOCK
Base Number Matches：1

DS12C887A 数据手册

 浏览型号DS12C887A的Datasheet PDF文件第2页 
DS12C887A  
Real-Time Clock  
www.maxim-ic.com  
FEATURES  
PIN ASSIGNMENT  
C Drop-in replacement for IBM AT computer  
clock/calendar  
MOT  
NC  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
VCC  
SQW  
NC  
2
3
4
5
6
7
8
9
10  
C Pin compatible with the MC146818B and  
DS1287A  
NC  
AD0  
AD1  
AD2  
AD3  
AD4  
AD5  
AD6  
AD7  
RCLR  
C Totally nonvolatile with over 10 years of  
operation in the absence of power  
C Self-contained subsystem includes lithium,  
quartz, and support circuitry  
NC  
IRQ  
RESET  
DS  
NC  
C Counts seconds, minutes, hours, days, day of  
the week, date, month, and year with leap-  
year compensation valid up to 2100  
C Binary or BCD representation of time,  
calendar, and alarm  
R/W  
AS  
11  
12  
CS  
GND  
DS12C887A  
24-Pin Encapsulated Package  
C 12- or 24-hour clock with AM and PM in 12-  
hour mode  
PIN DESCRIPTION  
C Daylight Savings Time option  
C Selectable between Motorola and Intel bus  
timing  
AD0–AD7 - Multiplexed Address/Data Bus  
NC  
- No Connect  
MOT  
- Bus Type Selection  
C Multiplex bus for pin efficiency  
C Interfaced with software as 128 RAM  
locations  
CS  
AS  
- RTC Chip Select Input  
- Address Strobe  
R/ W  
- Read/Write Input  
- Data Strobe  
– 15 bytes of clock and control registers  
– 113 bytes of general purpose RAM  
C Programmable square-wave output signal  
C Bus-compatible interrupt signals (IRQ)  
C Three interrupts are separately software-  
maskable and testable  
DS  
RESET  
- Reset Input  
IRQ  
- Interrupt Request Output  
- Square-Wave Output  
- +5V Main Supply  
SQW  
VCC  
– Time-of-day alarm once/second to  
once/day  
RCLR  
GND  
- RAM Clear  
- Ground  
– Periodic rates from 122ꢀs to 500ms  
– En-of-clock update cycle  
C Century register  
DESCRIPTION  
The DS12C887A real-time clock plus RAM is designed to be a direct upgrade replacement for the  
DS12887A in existing IBM-compatible personal computers to add hardware year-2000 compliance. A  
century byte was added to memory location 50, 32h, as called out by the PC AT specification. The  
DS12C887A is identical in form, fit, and function to the DS1287A, and provides additional 64 bytes of  
general-purpose RAM. Access to this additional RAM space is determined by the logic level presented on  
AD6 during the address portion of an access cycle. The RCLR pin is used to clear (set to logic 1) all 113  
bytes of general purpose RAM but does not affect the RAM associated with the real time clock. In order  
1 of 2  
111901  
12

中文翻译

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DS12C887A 替代型号

型号 品牌 替代类型 描述 数据表
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