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參數(shù)資料
| 型號： | LV8572AN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | LV8572A Low Voltage Real Time Clock (RTC) |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 329K |
| 代理商： | LV8572AN |
TL/F/11417
L
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.
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 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
m
p interface. The time power
fails may be logged into RAM automatically when V
BB
l
V
CC
. Additionally, two supply pins are provided. When
V
BB
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
power, and low battery detect.
(Continued)
Features
Y
3.3V
g
10% supply
Y
Full function real time clock/calendar
D 12/24 hour mode timekeeping
D Day of week and day of years counters
D Four selectable oscillator frequencies
D Parallel resonant oscillator
Y
Power fail features
D Internal power supply switch to external battery
D Power Supply Bus glitch protection
D Automatic log of time into RAM at power failure
Y
On-chip interrupt structure
D Periodic, alarm, and power fail interrupts
Y
Up to 44 bytes of CMOS RAM
Block Diagram
TL/F/11417–1
FIGURE 1
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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| LV8573A | LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AM | LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AN | LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AV | LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573M | LV8573A Low Voltage Real Time Clock (RTC) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LV8572AVX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| LV8573A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LV8573A Low Voltage Real Time Clock (RTC) |
| LV8573AV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LV8573A Low Voltage Real Time Clock (RTC) |
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