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参数资料
| 型号： | DS1307ZN+T&R/C02 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC RTC SERIAL IND 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM，方波输出 |
| 存储容量： | 56B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2 V ~ 3.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | 90-1307Z+C02 |
DS1307 64 x 8, Serial, I2C Real-Time Clock
6 of 14
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
X1
Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (CL) of 12.5pF.
X1 is the input to the oscillator and can optionally be connected to an external 32.768kHz
oscillator. The output of the internal oscillator, X2, is floated if an external oscillator is
connected to X1.
Note: For more information on crystal selection and crystal layout considerations, refer to
Application Note 58: Crystal Considerations with Dallas Real-Time Clocks.
2
X2
3
VBAT
Backup Supply Input for Any Standard 3V Lithium Cell or Other Energy Source. Battery
voltage must be held between the minimum and maximum limits for proper operation.
Diodes in series between the battery and the VBAT pin may prevent proper operation. If a
backup supply is not required, VBAT must be grounded. The nominal power-fail trip point
(VPF) voltage at which access to the RTC and user RAM is denied is set by the internal
circuitry as 1.25 x VBAT nominal. A lithium battery with 48mAh or greater will back up the
DS1307 for more than 10 years in the absence of power at +25°C.
UL recognized to ensure against reverse charging current when used with a lithium
battery. Go to: www.maxim-ic.com/qa/info/ul/.
4
GND
Ground
5
SDA
Serial Data Input/Output. SDA is the data input/output for the I2C serial interface. The
SDA pin is open drain and requires an external pullup resistor. The pullup voltage can be
up to 5.5V regardless of the voltage on VCC.
6
SCL
Serial Clock Input. SCL is the clock input for the I2C interface and is used to synchronize
data movement on the serial interface. The pullup voltage can be up to 5.5V regardless of
the voltage on VCC.
7
SQW/OUT
Square Wave/Output Driver. When enabled, the SQWE bit set to 1, the SQW/OUT pin
outputs one of four square-wave frequencies (1Hz, 4kHz, 8kHz, 32kHz). The SQW/OUT
pin is open drain and requires an external pullup resistor. SQW/OUT operates with either
VCC or VBAT applied. The pullup voltage can be up to 5.5V regardless of the voltage on
VCC. If not used, this pin can be left floating.
8
VCC
Primary Power Supply. When voltage is applied within normal limits, the device is fully
accessible and data can be written and read. When a backup supply is connected to the
device and VCC is below VTP, read and writes are inhibited. However, the timekeeping
function continues unaffected by the lower input voltage.
DETAILED DESCRIPTION
The DS1307 is a low-power clock/calendar with 56 bytes of battery-backed SRAM. The clock/calendar provides
seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including corrections for leap year. The DS1307 operates as a slave
device on the I2C bus. Access is obtained by implementing a START condition and providing a device identification
code followed by a register address. Subsequent registers can be accessed sequentially until a STOP condition is
executed. When VCC falls below 1.25 x VBAT, the device terminates an access in progress and resets the device
address counter. Inputs to the device will not be recognized at this time to prevent erroneous data from being
written to the device from an out-of-tolerance system. When VCC falls below VBAT, the device switches into a low-
current battery-backup mode. Upon power-up, the device switches from battery to VCC when VCC is greater than
VBAT +0.2V and recognizes inputs when VCC is greater than 1.25 x VBAT. The block diagram in Figure 1 shows the
main elements of the serial RTC.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1308 | 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 |
| DS1308N | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:64 X 8 Serial Real Time Clock |
| DS1308U-18 | 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 |
| DS1308U-18+ | 功能描述:实时时钟 LOW CUR 1.8V 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-18+T | 功能描述:实时时钟 LOW CUR 1.8V 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 |
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