DS1337S

Overview

The DS1337S is a low-power serial real-time clock (RTC) and calendar device manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, day, date, month, and year information with leap-year compensation valid up to the year 2100. The device features two programmable time-of-day alarms and a programmable square-wave output that defaults to 32kHz on power-up. Address and data are transferred serially through an I2C bus interface. The DS1337S operates fully when VCC is between 1.8V and 5.5V, while maintaining timekeeping operation with VCC as low as 1.3V. It is housed in an 8-pin SO package.

Feature Summary

• I2C Serial Interface for communication with microcontrollers
• Two Time-of-Day Alarms with programmable interrupt outputs
• Oscillator Stop Flag (OSF) to detect oscillator failure
• Programmable Square-Wave Output (1Hz, 4.096kHz, 8.192kHz, 32.768kHz)
• Leap-Year Compensation Valid Up to 2100

Applications

• Handhelds (GPS, POS Terminal, MP3 Player)
• Consumer Electronics (Set-Top Box, VCR/Digital Recording)
• Office Equipment (Fax/Printer, Copier)
• Medical Devices (Glucometer, Medicine Dispenser)
• Telecommunications (Router, Switch, Server)

Procurement Notes

Verify the specific suffix 'S' corresponds to the 8-pin SO package configuration. Confirm RoHS compliance status, as '+' denotes lead-free/RoHS-compliant devices. Check for any known errata associated with specific manufacturing revisions via the manufacturer's official documentation before finalizing procurement specifications.

Selection Notes

Select the DS1337S when an 8-pin surface-mount SO package is required. Ensure the application supports an external 32.768kHz quartz crystal connected to X1 and X2 pins, as this variant does not integrate the crystal internally unlike the DS1337C model. Verify that the system voltage remains above 1.8V for full I2C accessibility or above 1.3V for timekeeping maintenance.

Part Context

The DS1337S is part of the DS1337 family of serial real-time clocks. It shares core functionality with variants such as the DS1337+ (DIP-8), DS1337U (µSOP-8), and DS1337C (SOIC-16 with integrated crystal). The 'S' suffix specifically identifies the 8-pin Small Outline (SO) package option within this product line.

Replacement Considerations

DS1337S+