 DS1307Z+ device package |
 DS1307Z+ schematic symbol |
An RTC (real time clock) is an integrated circuit which implements a very accurate clock for time keeping in digital circuits. The RTCs are very widely used in computers, laptops, mobile phones, servers, and other embedded systems. In fact they are used in all those digital circuits which need to keep accurate time. One of the major advantages of RTC is that they include an alternate source of power and keep on functioning even when the main system’s power is shut off. The alternate power source used to be Lithium batteries in older RTCs however super-capacitors are mainly used now-a-days. The other advantages of RTC include low power consumption and accurate time keeping. RTCs use a 32.768 kHz crystal oscillator for clock pulse generation. The typical accuracy of these clocks is around 5 parts per million. Apart from standalone ICs, RTCs are also commonly integrated into microcontroller packages.
What is DS1307Z+？
The DS1307Z+ is a serial RTC (real time clock) manufactured by Maxim Integrated. This RTC IC features BCD clock/calendar and 56 bytes of NV SRAM. The address and data are communicated to the IC via I2C interface. The clock/calendar provides accurate information about seconds, minutes, hours, day, date, month and year. The IC also implements compensation for leap years as well as months less than 31 days. The clock is capable of operating in 12-hour and 24-hour modes with AM/PM indication. This RTC also implements power sensing circuit which detects the power cut-off and switches the system over backup power source.
Pin Configuration
The pin configuration of the DS1307Z+ real time clock is given in the table below:
| Pin number | Pin name | Pin description |
| 1 | X1 | Oscillator pin 1 |
| 2 | X2 | Oscillator pin 2 |
| 3 | VBAT | Backup battery voltage pin |
| 4 | GND | Ground pin |
| 5 | Vcc | External supply voltage |
| 6 | SQW/OUT | Output pin |
| 7 | SCL | Serial clock pin |
| 8 | SDA | Serial data pin |
Features
- Very accurate time keeping
- Compensation for leap years
- Compensation for months less than 31 days
- Compensation valid up to year 2100
- I2C serial interface
- Low power consumption
- Automatic power sensing and switching
- Compact form factor and footprint
Applications
The applications of DS1307Z+ RTC IC are provided as following:
- Single board computers
- PC/laptop motherboards
- Satellite systems
- Instrument clusters
- Automotive electronics
- Smart phones and tablets
- Programmable logic controllers
- Telecom equipment
- Embedded systems
Specifications
The major technical specifications of the DS1307Z+ RTC IC are provided as following:
- Terminals: 8
- Package: 8-pin SO
- Input voltage range: -0.5V to 7V
- Temperature range: 0 to 70 degrees
- Supply voltage: 5V
- Leakage current: 1uA
- Active supply current: 1.5mA
- SCL clock frequency: 100kHz
How DS1307Z+ work?
The DS1307Z+ is a real time clock IC from Maxim Integrated. This IC is very widely used in laptops, motherboards, satellite systems, telecom systems, automotive applications and embedded system. This RTC chip is capable of providing very accurate data about seconds, days, months, years and dates. This RTC chip contains a backup power source which allows it to keep functioning for extended periods of time even when the main power source is shut off. This IC can be interfaced to the microcontrollers and microprocessors using I2C interface.
A typical application circuit of the DS1307Z+ RTC IC is given in the figure below:
DS1307Z+ application circuit
DS1307Z+ Related Products Prices
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