DS1375T+

Real Time Clock Overview

The DS1375T+ is a low-power digital real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated. It maintains seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation valid up to the year 2100. The device operates from a digital clock input pin at frequencies of 32.768kHz, 8.192kHz, 60Hz, or 50Hz, eliminating the need for an internal crystal oscillator. It features two programmable alarms, a programmable square-wave output, and 16 bytes of SRAM. Data transfer occurs via a fast-mode I²C bidirectional bus supporting clock rates up to 400kHz. The component functions within a supply voltage range of 1.7V to 5.5V and is housed in a 6-pin TDFN-EP package.

Real Time Clock Feature Summary

• Digital Input RTC: Operates from external digital clock signals (32.768kHz, 8.192kHz, 60Hz, or 50Hz) without requiring an onboard crystal.
• Calendar Functionality: Counts time and date with automatic adjustments for month lengths and leap years through 2100.
• Alarm and Output: Includes two programmable time-of-day/date alarms and a programmable square-wave output on the SQW/INT pin.
• I²C Interface: Supports standard and fast-mode (up to 400kHz) serial communication for address and data transfer.

Real Time Clock Applications

• RTC complement to TCXO oscillators
• Utility meters
• Appliances
• Consumer electronics
• Automotive systems

Real Time Clock Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature range. The 'T+' designation indicates a lead-free/RoHS-compliant package. Confirm availability status with authorized distributors as stock levels fluctuate. Ensure the selected variant matches the required operating temperature range of -40°C to +85°C for the intended application environment.

Real Time Clock Selection Notes

Select the DS1375T+ when a system requires a low-power RTC driven by an existing digital clock source rather than a crystal. Verify that the host microcontroller supports the I²C protocol and can provide the necessary pull-up resistors for SDA and SCL lines. Ensure the power supply voltage remains within the 1.7V to 5.5V range. Consider the exposed pad thermal characteristics if high ambient temperatures are expected.

Real Time Clock Part Context

The DS1375 belongs to the Maxim Integrated digital RTC family designed to replace traditional crystal-based clocks in space-constrained applications. The DS1375T+ specifically denotes the tape-and-reel packaging format for surface-mount assembly. It shares functional similarities with other I²C RTCs but distinguishes itself by accepting a digital clock input, simplifying board layout by removing the need for crystal components and load capacitors.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements may include other Maxim I²C RTCs such as the DS1307 series, though interface differences exist. Verify compatibility regarding clock input requirements, as many alternatives require external crystals. Check register map compatibility if migrating firmware. Ensure voltage ranges and package dimensions match the existing design constraints.