DS1337C#

Overview

The DS1337C is a low-power I2C serial real-time clock and calendar manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation valid up to the year 2100. The device operates within a supply voltage range of 1.8V to 5.5V for full functionality, while maintaining timekeeping at voltages as low as 1.3V. It features two programmable alarms and a square-wave output. The DS1337C variant integrates a standard 32.768kHz crystal within its 16-pin SO package, eliminating the need for external oscillator components.

Feature Summary

• Integrated 32.768kHz crystal in 16-pin SO package
• I2C serial interface supporting Standard (100kHz) and Fast (400kHz) modes
• Automatic date adjustment including leap-year correction through 2100
• Two programmable time-of-day alarms and programmable square-wave output

Applications

• Handheld devices such as GPS units, POS terminals, and MP3 players
• Consumer electronics including set-top boxes and digital recording equipment
• Office equipment like fax machines, printers, and copiers
• Medical devices such as glucometers and medicine dispensers
• Telecommunications infrastructure including routers, switches, and servers

Procurement Notes

Verify that the specific part number includes the '#' suffix to confirm RoHS compliance and lead finish compatibility. Confirm package type is 16-pin SO with integrated crystal. Check manufacturing revision status against official errata documentation before finalizing procurement specifications.

Selection Notes

Select the DS1337C when board space savings are critical due to the integrated crystal. Ensure the design supports an I2C bus operating between 1.8V and 5.5V. Verify that external pull-up resistors are included for SDA and SCL lines. Consider the -40°C to +85°C industrial temperature range for environmental suitability.

Part Context

The DS1337C belongs to the DS1337 family of serial real-time clocks. It shares functional similarities with the DS1337S and DS1337U but differs in packaging and oscillator integration. While other variants require external crystals, the DS1337C incorporates the oscillator internally, simplifying the schematic and reducing component count for surface-mount designs.

Replacement Considerations

Public confirmed substitute part numbers: None.