DS1343D-18+T&R

Real Time Clock Overview

The DS1343D-18+T&R is a low-current real-time clock (RTC) from Analog Devices/Maxim Integrated, housed in a 14-pin TDFN package. 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 operates within a voltage range of 1.71V to 5.5V for VCC and 1.3V to 5.5V for VBAT. Key electrical parameters include a typical standby current of 250nA and a minimum timekeeping voltage of 1.3V. It features 96 bytes of battery-backed NV RAM and two programmable alarms.

Real Time Clock Feature Summary

• Low Timekeeping Current: Typical standby current of 250nA extends backup supply life.
• High-ESR Crystal Support: Compatible with crystals having ESR up to 100kΩ.
• Integrated Capacitive Loading: Designed for 6pF load capacitance crystals.
• Dual Interface: Supports Motorola SPI Modes 1 and 3, or standard 3-wire communication.

Real Time Clock Applications

• Medical devices requiring precise timestamping
• Handheld portable electronics
• Telematics systems
• Embedded timestamping applications

Real Time Clock Procurement Notes

Verify the component status as discontinued or end-of-life through official manufacturer channels. Confirm that the T&R suffix indicates tape and reel packaging suitable for automated assembly. Ensure compatibility with RoHS3 standards if required by the target application regulations.

Real Time Clock Selection Notes

Select this model for designs requiring low power consumption and support for high-ESR crystals. The -18 suffix specifies operation at 1.8V nominal voltage (1.71V min). Choose between DS1343 (6pF CL) and DS1344 (12.5pF CL) based on crystal specifications. Ensure the system interface matches the selected SPI or 3-wire mode via the SERMODE pin.

Real Time Clock Part Context

This part belongs to the DS1343/DS1344 family of low-current RTCs. The 'D' suffix denotes the 14-pin TDFN package, while '18' indicates the 1.8V operating voltage variant. The '+T&R' suffix specifies lead-free/RoHS compliance and tape-and-reel packaging. It shares functional similarities with the DS1344 but differs in integrated capacitive loading for 6pF crystals.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consider evaluating other members of the DS134x family or consulting manufacturer resources for direct replacements.