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DS1644L-120 PDF预览

DS1644L-120

更新时间： 2024-11-22 22:15:19
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光电二极管双倍数据速率
页数 文件大小 规格书
11页 110K
描述
Nonvolatile Timekeeping RAM

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中文翻译

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DS1644L-120 技术参数

生命周期：TransferredReach Compliance Code：unknown
风险等级：5.64Is Samacsys：N
外部数据总线宽度：8信息访问方法：PARALLEL, DIRECT ADDRESS
中断能力：NJESD-30 代码：R-PDSO-U34
端子数量：34计时器数量：
片上数据RAM宽度：8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：SOJ-I封装等效代码：MODULE,34LEAD,1.0
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
电源：5 V认证状态：Not Qualified
RAM（字数）：32000子类别：Timer or RTC
最大压摆率：60 mA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端子形式：J INVERTED
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

DS1644L-120 数据手册

 浏览型号DS1644L-120的Datasheet PDF文件第2页浏览型号DS1644L-120的Datasheet PDF文件第3页浏览型号DS1644L-120的Datasheet PDF文件第4页浏览型号DS1644L-120的Datasheet PDF文件第5页浏览型号DS1644L-120的Datasheet PDF文件第6页浏览型号DS1644L-120的Datasheet PDF文件第7页 
DS1644LPM  
DS1644LPM  
Nonvolatile Timekeeping RAM  
FEATURES  
PIN ASSIGNMENT  
• Upward compatible with the DS1643AL Timekeeping  
NC  
NC  
NC  
1
2
3
4
5
6
7
8
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
NC  
NC  
A14  
A13  
A12  
A11  
A10  
A9  
A8  
A7  
A6  
A5  
RAM to achieve higher RAM density  
• Integrated NV SRAM, real time clock, crystal, power–  
fail control circuit and lithium energy source  
PFO  
V
CC  
WE  
OE  
CE  
• Low profile socketable module  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
DQ2  
DQ1  
DQ0  
GND  
9
–
255 mil package height  
10  
11  
12  
13  
14  
15  
16  
17  
• Clock registers are accessed identical to the static  
RAM. These registers are resident in the eight top  
RAM locations.  
A4  
A3  
A2  
A1  
• Totally nonvolatile with over 10 years of operation in  
the absence of power  
A0  
34–PIN LOW PROFILE MODULE  
• Access time of 120 ns and 150 ns  
• Quartz accuracy ±1 minute a month @ 25°C, factory  
PIN DESCRIPTION  
calibrated  
A0–A14  
CE  
–
–
–
–
–
–
–
–
–
Address Input  
Chip Enable  
Output Enable  
Write Enable  
+5 Volts  
• BCD coded year, month, date, day, hours, minutes,  
and seconds with leap year compensation valid up to  
2100  
OE  
WE  
V
GND  
CC  
Ground  
• Power–fail write protection allows for ±10% V pow-  
CC  
DQ0-DQ7  
NC  
PFO  
Data Input/Output  
No Connection  
Power Fail Output  
er supply tolerance  
ORDERING INFORMATION  
DS1644L–XXX Low Profile Module  
–120 120 ns access  
–150 150 ns access  
DESCRIPTION  
The DS1644L is a low profile module that requires a  
PLCC surface mountable socket and is functionally  
equivalent to the DS1644. The DS1644L is a 32K x 8  
nonvolatilestatic RAM with a full function real time clock  
which are both accessible in a Byte–wide format. The  
real time clock information resides in the eight upper-  
most RAM locations. The RTC registers contain year,  
month, date, day, hours, minutes, and seconds data in  
24 hour BCD format. Corrections for the day of the  
month and leap year are made automatically. The RTC  
clockregistersaredoublebufferedtoavoidaccessofin-  
correct data that can occur during clock update cycles.  
The double buffered system also prevents time loss as  
the timekeeping countdown continues unabated by ac-  
cess to time register data. The DS1644L also contains  
its own power–fail circuitry which deselects the device  
when the V  
supply is in an out–of–tolerance condi-  
CC  
tion. This feature prevents loss of data from unpredict-  
able system operation brought on by low V as errant  
CC  
access and update cycles are avoided.  
ECopyright 1995 by Dallas Semiconductor Corporation.  
All Rights Reserved. For important information regarding  
patents and other intellectual property rights, please refer to  
Dallas Semiconductor data books.  
041697 1/11  
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中文翻译

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与DS1644L-120相关器件

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 		Real Time Clock, Non-Volatile, 0 Timer(s), CMOS,
DS-1644L-150 DALLAS

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DS-1644L-150 MAXIM

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 		Real Time Clock, Non-Volatile, 0 Timer(s), CMOS, PDSO34
DS1644L-150 DALLAS

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 		Nonvolatile Timekeeping RAM
DS1644LPM DALLAS

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 		Nonvolatile Timekeeping RAM
DS1644P DALLAS

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 		Nonvolatile Timekeeping RAM
DS1644P MAXIM

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 		Nonvolatile Timekeeping RAM
DS1644P+120 DALLAS

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 		Nonvolatile Timekeeping RAM
DS1644P-120 DALLAS

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 		Nonvolatile Timekeeping RAM
DS1644P120+ DALLAS

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 		Nonvolatile Timekeeping RAM

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