DS1339BU+

Interface:	I²C, 2-Wire Serial
Base Part Number:	DS1339
Supplier Device Package:	8-uMAX
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	200µA @ 1.71V ~ 5.5V
Voltage - Supply, Battery:	1.3 V ~ 3.7 V
Voltage - Supply:	1.71 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	--
Features:	Alarm, Leap Year, Square Wave Output, Trickle-Charger
Type:	Clock/Calendar
Part Status:	Active
Packaging:	Tube

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DS1339BU+ Application Field and Working Principle

The DS1339BU+ is a real-time clock manufactured by Maxim Integrated, built as a compact, low-power device for accurate timekeeping in computer systems, handheld devices, and other portable electronics. The DS1339BU+ supports a wide variety of memory organization and includes a timekeeping power source switching circuit. With the capability to operate from voltages as low as 1.2 V, this device can be a powerful timekeeping solution in a variety of systems.The DS1339BU+ is used for a diverse range of applications, including automotive systems, medical equipments, security systems, and industrial control systems. It is designed to reduce battery consumption, enabling longer battery life in portable applications. The device also enables an automated power-failure detect and reset circuit to ensure reliable system timing in the event of power failure.

Operating Principles

The DS1339BU+ operates using a crystal oscillator and real-time clock circuit. The crystal is used to measure the passage of time, with the measurement based on the frequency of the crystal, usually 32.768 kHz. This frequency is divided down and used to form a counter. The counter is used to update and maintain the real-time clock which is controlled by an integrated circuit. The circuit is used to control all the functions of the device, such as timekeeping, alarm management, and power management.The DS1339BU+ also provides a battery switchover circuit, which monitors the presence of power from an external power source and switches to the battery back-up in the event of power loss. This ensures that the clock remains operational during power outages.

Features

The DS1339BU+ is a 8-pin device that includes a number of key features, such as:

• Wide Operating Range: 1.2 V to 5.5 V (typical)
• High Accuracy: ±2 ppm
• Low Power: 2.5 µA (max)
• Battery Switchover Circuit
• 4 Programmable Alarms
• 56-bit On-chip Nonvolatile Memory Chronometer
• Programmable Event Flags
• Temperature compensation

In addition, the device includes an integrated Crystal Oscillator, a 32-bit RAM buffer, timekeeping, and alarm management functions. The device also features a power fail detection circuit and an internal charge pump to supply higher voltages.

Conclusion

The DS1339BU+ is a powerful and cost-effective real-time clock designed to provide accurate timekeeping and alarm management in a wide range of electronic applications. The device is designed to reduce power consumption, enabling longer battery life and improved system reliability. With the support of a battery powering switchover mechanism, the DS1339BU+ is capable of providing uninterrupted timekeeping, even after power outages or power failures.

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