DS1343D-33+T&R

$6.77

Description：IC RTC CLK/CALENDAR SPI 14TDFN
Series：-

SKU:b7c56e6b1500 Category: Real Time Clocks Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

DS1343D-33+T&R is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Analog Devices Inc./Maxim Integrated. Its product description is IC RTC CLK/CALENDAR SPI 14TDFN. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for DS1343D-33+T&R

Description：IC RTC CLK/CALENDAR SPI 14TDFN
Series：-
Package：Tape & Reel (TR),Cut Tape (CT)
Mfr：Analog Devices Inc./Maxim Integrated
Type：Clock/Calendar
Features：Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger
Memory Size：96B
Time Format：HH:MM:SS (12/24 hr)
Date Format：YY-MM-DD-dd
Interface：SPI
Voltage - Supply：3V ~ 5.5V
Voltage - Supply, Battery：1.3V ~ 5.5V
Current - Timekeeping (Max)：120µA ~ 160µA @ 3.63V ~ 5.5V
Operating Temperature：-40°C ~ 85°C
Mounting Type：Surface Mount
Grade：-
Qualification：-
Package / Case：14-WFDFN Exposed Pad
Supplier Device Package：14-TDFN (3x3)

Real Time Clock datasheet and documents for DS1343D-33+T&R

DS1343D-33+T&R

Real Time Clock Overview

The DS1343D-33+T&R is a low-current real-time clock (RTC) from Analog Devices/Maxim Integrated, operating within the DS1343 family. It provides timekeeping for seconds through year with leap-year compensation valid through 2099. The device supports SPI or 3-wire serial interfaces and includes two programmable alarms with interrupt outputs. It features 96 bytes of battery-backed NV RAM. Electrical characteristics include a VCC range of 3.0V to 5.5V and standby current of 120µA at 3.63V. It maintains time down to 1.15V and operates in the -40°C to +85°C temperature range.

Real Time Clock Feature Summary

SPI/3-Wire Interface: Supports Motorola SPI Modes 1 and 3 or standard 3-wire communication via CE, SCLK, SDI, and SDO pins.
Low Power Consumption: Typical timekeeping current of 250nA; standby current is 120µA at 3.63V and 160µA at 5.5V.
High ESR Crystal Support: Compatible with crystal equivalent series resistance (ESR) up to 100kΩ.
Integrated Capacitive Loading: Designed for 12.5pF load capacitance crystals (DS1344 variant).
Battery Backup: Maintains time down to 1.15V typical with automatic power-fail switching.

Real Time Clock Applications

Medical devices requiring precise timestamping
Handheld portable electronics
Telematics systems
Embedded data logging

Real Time Clock Procurement Notes

Verify the suffix 'D' indicates the TDFN package and '-33' specifies the 3.3V nominal supply voltage. Confirm RoHS compliance status as per the latest manufacturer documentation. Ensure the ordering suffix '+T&R' matches the required reel packaging format for surface-mount assembly.

Real Time Clock Selection Notes

Select this model over the DS1343D-33 if the application requires support for 12.5pF load capacitors, as the DS1344 variant includes integrated loading for this value. Verify that the system interface supports either SPI or 3-wire protocols. Ensure the backup supply can maintain voltage above the minimum timekeeping threshold of 1.15V.

Real Time Clock Part Context

This component belongs to the DS1343/DS1344 family of low-current RTCs. The DS1343 variant is optimized for 6pF crystals, while the DS1344 variant supports 12.5pF crystals. Both share identical pinouts and register maps but differ in internal oscillator loading capacitance.