Datasheet > LV8572AV

LV8572AV

更新时间： 2024-11-06 20:38:07

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
20页	327K
描述
IC 0 TIMER(S), REAL TIME CLOCK, PQCC28, PLASTIC, LCC-28, Timer or RTC

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LV8572AV 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	QCCJ, LDCC28,.5SQ	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.41	Base Number Matches：	1

LV8572AV 数据手册

PRELIMINARY

December 1993

LV8572A Low Voltage Real Time Clock (RTC)

General Description

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

. Additionally, two supply pins are provided. When

, 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

power, and low battery detect.

(Continued)

Features

3.3V 10% supply

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.

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

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.

1995 National Semiconductor Corporation

TL/F/11417

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7...20

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与LV8572AV相关器件

型号	品牌	获取价格	描述	数据表
LV8572AVX	TI	获取价格	IC,REAL-TIME CLOCK,CMOS,LDCC,28PIN,PLASTIC
LV8573A	NSC	获取价格	LV8573A Low Voltage Real Time Clock (RTC)
LV8573AM	NSC	获取价格	LV8573A Low Voltage Real Time Clock (RTC)
LV8573AN	NSC	获取价格	LV8573A Low Voltage Real Time Clock (RTC)
LV8573AV	NSC	获取价格	LV8573A Low Voltage Real Time Clock (RTC)
LV8573M	NSC	获取价格	LV8573A Low Voltage Real Time Clock (RTC)
LV86	NSC	获取价格	3V Enhanced CMOS Quad Differential Line Receiver
LV86	NXP	获取价格	Quad 2-input EXCLUSIVE-OR gate
LV86	TI	获取价格	QUADRUPLE 2-INPUT EXCLUSIVE-OR GATES
LV86	HITACHI	获取价格	Quad. 2-input Exclusive-OR Gates

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