DS1343D-33+T&R by Analog Devices

Low-Current SPI/3-Wire RTCs


The DS1343/DS1344 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, permitting longer life from a backup supply source. The devices also support high-ESR crystals, broadening the pool of usable crystals for the devices. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an active-low AM/PM indicator. Address and data are transferred serially through an SPI™ or 3-wire interface. Two programmable time-of-day alarms are provided. Each alarm can generate an interrupt on a combination of seconds, minutes, hours, and day. Don't-care states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time-of-day alarms can be programmed to assert two different interrupt outputs, or they can be combined to assert one common interrupt output. Both interrupt outputs operate when the device is powered by either VCC or VBAT. The devices are available in a lead-free/RoHS-compliant, 20-pin TSSOP or 14-pin TDFN package, and support a -40°C to +85°C extended industrial temperature range.

Where to Buy

Prices starting from US$2.96

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Features

Low Timekeeping Current of 250nA (typ)
Compatible with Crystal ESR Up to 100kΩ
Versions Available to Support Either 6pF or 12.5pF Crystals
RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099
Power-Fail and Switch Circuitry
Three Operating Voltages 1.8V ±5% 3.0V ±10% 3.3V ±10%
1.8V ±5%
3.0V ±10%
3.3V ±10%
Trickle-Charge Capability
Maintain Time Down to 1.15V (typ)
Support Motorola SPI Modes 1 and 3, or Standard 3-Wire Interface
Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
96-Byte Battery-Backed NV RAM for Data Storage
Two Time-of-Day Alarms with Two Interrupt Outputs
Industrial Temperature Range
20-Pin TSSOP or 14-Pin TDFN Package

Specifications

Interface 3-WireSPI
VSUPPLY (V) 1.71 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 250
CL (pF) 6
Memory Type NV SRAM
Memory Size (Bytes) 96
Time of Day Alarms 2
Package/Pins TDFN/14TSSOP/20
BudgetaryPrice (See Notes) 2.49


DS1343D-33+T&R Semiconductors - ICs by Analog Devices

RTC W/ NVRAM 768B HH:MM:SS TDFN-14

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Date Format Day
Clock Format HH
Clock IC Type Alarm RTC
Supply Voltage Min 3V
Supply Voltage Max 5.5V
Clock IC Case Style TDFN
No. of Pins 14Pins
IC Interface Type SPI
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

Low-Current SPI/3-Wire RTCs | Analog Devices
RTC W/ NVRAM, 768B, HH: MM: SS, TDFN-14 | Farnell

Frequently Asked Questions

Where can I find additional details, specifications and documents for a DS1343D-33+T&R ?

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Is the DS1343D-33+T&R RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, element14 and Farnell have stock available or on a lead time for DS1343D-33+T&R .

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