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LV8572AM

更新时间： 2024-11-05 22:30:55
品牌 Logo 应用领域
美国国家半导体 - NSC 外围集成电路光电二极管双倍数据速率时钟
页数 文件大小 规格书
20页 330K
描述
LV8572A Low Voltage Real Time Clock (RTC)

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中文翻译

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LV8572AM 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：SOP, SOP24,.4Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.84外部数据总线宽度：8
信息访问方法：PARALLEL, DIRECT ADDRESS中断能力：Y
JESD-30 代码：R-PDSO-G24JESD-609代码：e0
长度：15.4 mm端子数量：24
计时器数量：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：SOP封装等效代码：SOP24,.4
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：NOT SPECIFIED电源：3.3 V
认证状态：Not Qualified座面最大高度：2.65 mm
子类别：Timer or RTC最大供电电压：3.6 V
最小供电电压：3 V标称供电电压：3.3 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL最短时间：1/100 SECOND
处于峰值回流温度下的最长时间：NOT SPECIFIED易失性：YES
宽度：7.5 mmuPs/uCs/外围集成电路类型：TIMER, REAL TIME CLOCK
Base Number Matches：1

LV8572AM 数据手册

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PRELIMINARY  
December 1993  
LV8572A Low Voltage Real Time Clock (RTC)  
General Description  
l
The LV8572A is intended for use in microprocessor based  
systems where information is required for multi-tasking, data  
logging or general time of day/date information. This device  
is implemented in low voltage silicon gate microCMOS tech-  
nology to provide low standby power in battery back-up en-  
vironments. The circuit’s architecture is such that it looks  
like a contiguous block of memory or I/O ports. The address  
space is organized as 2 software selectable pages of 32  
bytes. This includes the Control Registers, the Clock Coun-  
ters, the Alarm Compare RAM, and the Time Save RAM.  
Any of the RAM locations that are not being used for their  
intended purpose may be used as general purpose CMOS  
RAM.  
fails may be logged into RAM automatically when V  
BB  
. Additionally, two supply pins are provided. When  
V
V
CC  
l
V
CC  
, internal circuitry will automatically switch from  
the main supply to the battery supply. Status bits are provid-  
ed to indicate initial application of battery power, system  
BB  
power, and low battery detect.  
(Continued)  
Features  
Y
g
3.3V 10% supply  
Y
Full function real time clock/calendar  
Ð 12/24 hour mode timekeeping  
Ð Day of week and day of years counters  
Ð Four selectable oscillator frequencies  
Ð Parallel resonant oscillator  
Time and date are maintained from 1/100 of a second to  
year and leap year in a BCD format, 12 or 24 hour modes.  
Day of week, day of month and day of year counters are  
provided. Time is controlled by an on-chip crystal oscillator  
requiring only the addition of the crystal and two capacitors.  
The choice of crystal frequency is program selectable.  
Y
Power fail features  
Ð Internal power supply switch to external battery  
Ð Power Supply Bus glitch protection  
Ð Automatic log of time into RAM at power failure  
On-chip interrupt structure  
Ð Periodic, alarm, and power fail interrupts  
Up to 44 bytes of CMOS RAM  
Y
Y
Power failure logic and control functions have been integrat-  
ed on chip. This logic is used by the RTC to issue a power  
fail interrupt, and lock out the mp interface. The time power  
Block Diagram  
TL/F/11417–1  
FIGURE 1  
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.  
C
1995 National Semiconductor Corporation  
TL/F/11417  
RRD-B30M105/Printed in U. S. A.  
1234567...20

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