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DS1308
Low-Current I2C RTC with 56-Byte NV RAM
General Description
The DS1308 serial real-time clock (RTC) is a low-power,
full binary-coded decimal (BCD) clock/calendar plus
56 bytes of NV RAM. Address and data are transferred
serially through an I2C interface. The clock/calendar
provides seconds, minutes, hours, day, date, month,
and year information. The end of the month date is auto-
matically adjusted for months with fewer than 31 days,
including corrections for leap year. The clock operates
in either the 24-hour or 12-hour format with an AM/PM
indicator. The DS1308 has a built-in power-sense circuit
that detects power failures and automatically switches to
the backup supply, maintaining time and date operation.
Applications
Handhelds (GPS, POS Terminal)
Consumer Electronics (Set-Top Box, Digital
Recording, Network Appliance)
Office Equipment (Fax/Printer, Copier)
Medical (Glucometer, Medicine Dispenser)
Telecommunications (Router, Switcher, Server)
Other (Utility Meter, Vending Machine,
Thermostat, Modem)
Features
S
Low Timekeeping Current of 250nA (typ)
S
Compatible with Crystal ESR Up to 100kω
S
RTC Counts Seconds, Minutes, Hours, Date,
Month, Day of the Week, and Year with Leap-Year
Compensation Up to 2400
S
56-Byte, Battery-Backed, General-Purpose RAM
with Unlimited Writes
S
I2C Serial Interface
S
External Clock Source for Synchronization Clock
Reference (e.g., 32kHz, 50Hz/60Hz Powerline, GPS
1PPS)
S
Programmable Square-Wave Output Signal
S
Automatic Power-Fail Detect and Switch Circuitry
S
-40NC to +85NC Operating Temperature Range
S
Underwriters Laboratories (UL) Recognized
Typical Operating Circuit
19-6353; Rev 1; 4/13
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/DS1308.related
DS1308
SCL
SDA
SQW/CLKIN
X1
X2
VBAT
GND
VCC
RPU
CPU
VCC
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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相关代理商/技术参数
DS1308U-3+T 功能描述:实时时钟 LOW CUR 3V I2C RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS1308U-33 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Current I2C RTC with 56-Byte NV RAM
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