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LV8573AN

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		时钟
页数	文件大小	规格书
18页	308K
描述
LV8573A Low Voltage Real Time Clock (RTC)

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LV8573AN 数据手册

PRELIMINARY

December 1993

LV8573A Low Voltage Real Time Clock (RTC)

General Description

main supply to the battery supply.

The LV8573A 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 organized as

one block of 32 bytes. This includes the Control Registers,

the Clock Counters, the Alarm Compare RAM, and the Time

Save RAM.

V , internal circuitry will automatically switch from the

The LV8573A’s interrupt structure provides three basic

types of interrupts: Periodic, Alarm/Compare, and Power

Fail. Interrupt mask and status registers enable the masking

and easy determination of each interrupt.

Features

3.3V 10% supply

Full function real time clock/calendar

Ð 12/24 hour mode timekeeping

Ð Day of week counter

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 and day of month counters are provided. Time

is controlled by an on-chip crystal oscillator requiring only

the addition of the 32.768 kHz crystal and two capacitors.

Ð Parallel resonant oscillator

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

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

fails may be logged into RAM automatically when V

. Additionally, two supply pins are provided. When V

Ð Periodic, alarm, and power fail interrupts

Block Diagram

TL/F/11418–1

FIGURE 1

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/11418

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

12 3 4 5 6 7...18

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