DS1337 I2C Serial Real-Time Clock

DS1337U – I2C Serial Real-Time Clock – Analog Devices

The DS1337U from Analog Devices is a low-power I²C serial real-time clock (RTC) engineered for precise timekeeping in embedded systems. Featuring ultra-low current consumption and wide voltage operation, this IC ensures reliable calendar/clock functionality while minimizing power drain—ideal for battery-backed applications.

Key Features

• Ultra-Low Power: 0.6µA timekeeping current @ 1.3V–1.8V
• Wide Voltage Range: Operates from 1.8V to 5.5V
• I²C Serial Interface: Simple 2-wire communication
• Time/Date Format: HH:MM:SS (12/24 hr) + YY-MM-DD-dd
• Advanced Functions: Alarm, leap year compensation, programmable square wave output

Technical Details

This clock/calendar IC provides binary-coded decimal (BCD) timekeeping with automatic leap-year correction. The I²C interface supports standard (100kHz) and fast (400kHz) modes. Housed in a space-saving 8-uMAX/uSOP surface-mount package (3.00mm width), it withstands industrial temperatures from -40°C to +85°C. The DS1337U+ base design ensures compatibility across Analog Devices’ RTC portfolio.

Typical Applications

• Smart meters & utility monitoring systems
• IoT sensors and wearable devices
• Medical equipment & portable diagnostics
• Industrial automation controllers
• Data loggers and backup systems

About Analog Devices

Analog Devices (ADI) is a global leader in high-performance semiconductor solutions, renowned for precision analog and mixed-signal ICs. Their acquisition of Maxim Integrated further strengthened expertise in power management, data conversion, and timing technologies.

ADI components are industry benchmarks for reliability and innovation, with rigorous testing protocols ensuring consistent performance in critical applications. PCX partners directly with Analog Devices to guarantee authentic, traceable components.

About Real-Time Clocks

Real-Time Clocks (RTCs) are specialized integrated circuits that track time and calendar data independently of a system’s main processor. They maintain accurate timing during power loss via battery backup, making them indispensable for timestamping events, scheduling operations, and maintaining system integrity.

Modern RTCs like the DS1337U minimize power consumption while offering advanced features such as alarms, temperature compensation, and digital interfaces. They serve as the chronological backbone in embedded systems across automotive, industrial, and consumer electronics.

Packaging

Available in protective Tube packaging for automated assembly processes. Contact PCX for reel packaging options or custom quantities.

FAQs

Q: Does the DS1337U require an external crystal?
A: Yes, it requires a standard 32.768kHz tuning fork crystal for timekeeping.

Q: What is the typical backup battery lifetime?
A: With 0.6µA draw and a 48mAh coin cell, expect ~9 years of backup time.

Q: Is this RTC Y2K-compliant?
A: Yes, it handles leap years through 2100 with BCD date formatting.

Q: Can I cascade multiple RTCs on one I²C bus?
A: Yes, the DS1337U supports 8 user-programmable I²C addresses (0x68–0x6F).

Q: Does PCX provide design support for RTC integration?
A: Yes! Our engineers offer schematic review assistance and datasheet guidance.

Q: Are Analog Devices RTCs RoHS compliant?
A: Absolutely—this device meets all current environmental regulations.

Product images are representational. Refer to datasheet for exact specifications.

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