DS1339C-2

Real Time Clock Overview

The DS1339C-2 is a low-power, I2C serial real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation up to the year 2100. The device features two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially via a 2-wire I2C bus. A built-in power-sense circuit detects power failures and automatically switches to a backup supply, maintaining timekeeping operations. The component operates within a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Serial Interface: Utilizes a 2-wire bidirectional bus for address and data transfer.
• Automatic Calendar: Counts seconds through year with leap-year correction up to 2100.
• Dual Alarms: Includes two programmable time-of-day alarms.
• Power-Fail Detection: Built-in circuitry detects power loss and switches to backup supply.

Real Time Clock Applications

• Handheld devices such as GPS units and POS terminals
• Consumer electronics including set-top boxes and digital recorders
• Telecommunications equipment like routers and servers

Real Time Clock Part Context

The DS1339C-2 belongs to the DS1339 family of serial real-time clocks. It serves as a drop-in replacement for earlier iterations like the DS1339A, offering similar functionality in a compact package. The 'C' suffix typically denotes the commercial temperature grade (-40°C to +85°C), while the '-2' indicates specific voltage or packaging variations within the product line.

Real Time Clock Replacement Considerations

The DS1339A is documented as a direct drop-in replacement for the DS1339 series. Domestic alternatives such as the RS4C1339 offer compatible pinouts and functional specifications, including I2C interface and alarm capabilities, for design substitution purposes.