DS1344E-3+

Real Time Clock Overview

The DS1344E-3+ is a low-current real-time clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping and calendar functions including seconds, minutes, hours, day, date, month, and year with leap year compensation valid through 2099. The device supports SPI or 3-wire serial interfaces and includes 96 bytes of battery-backed NV RAM. Electrical specifications include a VCC operating range of 3V to 5.5V and a VBAT range of 1.3V to 5.5V. Typical standby current is 250nA, while active power-supply current ranges from 120µA to 160µA at 3.63V to 5.5V. It operates within an industrial temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated capacitive loading for 12.5pF crystals
• Two programmable time-of-day alarms with interrupt outputs
• 96-byte battery-backed non-volatile RAM
• Trickle-charge capability for backup sources

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the component matches the specific package variant required, as the DS1344 family is available in both 20-pin TSSOP and 14-pin TDFN packages. Confirm that the ordering suffix corresponds to the intended interface mode configuration and packaging format before finalizing procurement.

Real Time Clock Selection Notes

Select the DS1344E-3+ over the DS1343 variant when the application requires integrated capacitive loading for 12.5pF load capacitance crystals. Ensure the system design accommodates the 3V nominal supply voltage requirements specified for the -3 series devices.

Real Time Clock Part Context

This component belongs to the DS1343/DS1344 family of low-current SPI/3-wire RTCs. The 'E' suffix typically denotes the 20-pin TSSOP package option, distinguishing it from the 'D' suffix which indicates the 14-pin TDFN package. Both variants share identical electrical characteristics and functional capabilities.

Real Time Clock Replacement Considerations

The DS1343E-3+ serves as a direct functional substitute if the application utilizes 6pF crystals instead of 12.5pF crystals. Other members of the DS134x family may require verification of crystal load capacitance compatibility and package pinout alignment.