DS1344D-3+

Real Time Clock Overview

The DS1344D-3+ is a low-current real-time clock (RTC) from Analog Devices/Maxim Integrated. It provides timekeeping with seconds, minutes, hours, day, date, month, and year information, including leap year compensation through 2099. The device supports SPI or 3-wire interfaces and includes two programmable alarms with interrupt outputs. It features 96 bytes of battery-backed NV RAM and operates within an extended industrial temperature range of -40°C to +85°C. Electrical characteristics include a typical standby current of 250nA, support for high-ESR crystals up to 100kΩ, and integrated capacitive loading for 12.5pF crystals.

Real Time Clock Feature Summary

• Low Timekeeping Current: Typical standby current of 250nA.
• High-ESR Crystal Support: Compatible with crystal ESR up to 100kΩ.
• Integrated Capacitance: Designed for 12.5pF load capacitance crystals.
• Dual Interface: Supports Motorola SPI Modes 1 and 3, or standard 3-wire interface.
• Battery Backup: Maintains time down to 1.15V (typical).

Real Time Clock Applications

• Medical devices
• Handheld devices
• Telematics systems
• Embedded timestamping

Real Time Clock Procurement Notes

Verify the specific suffix 'D' indicates the TDFN package variant when sourcing. Confirm the '-3' voltage rating matches the system's 3.0V nominal supply requirements. Check for RoHS compliance status as indicated by the '+' suffix in ordering information.

Real Time Clock Selection Notes

Select the DS1344 over the DS1343 if the application requires integrated capacitive loading for 12.5pF crystals rather than 6pF. Ensure the design accommodates the 20-pin TSSOP or 14-pin TDFN package constraints. Verify that the system power supply falls within the 2.7V to 5.5V operating range for the '-3' variant.

Real Time Clock Part Context

The DS1344D-3+ belongs to the DS1343/DS1344 family of low-current RTCs. The 'D' suffix typically denotes the TDFN package option, while '-3' specifies the 3.0V nominal voltage version. This component is part of Maxim Integrated's portfolio now under Analog Devices, designed for battery-powered applications requiring precise timekeeping.

Real Time Clock Replacement Considerations

The DS1343D-3+ is a functional alternative within the same family but uses 6pF crystal loading instead of 12.5pF. Direct pin-to-pin replacement is possible if the crystal load capacitance matches the new component's specifications.