DS1343E-33+ Maxim Integrated Products, DS1343E-33+ Datasheet

DS1343E-33+

Manufacturer Part Number

DS1343E-33+

Description

Real Time Clock SONET/SDH sync IC CSBGA LEADED

Manufacturer

Maxim Integrated Products

Datasheets

1.DS1343E-18.pdf (20 pages)

2.DS1343E-33.pdf (20 pages)

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19-5801; Rev 0; 3/11

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 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 inter-

rupt 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 V

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.

Ordering Information

SPI is a trademark of Motorola, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Medical

Handheld Devices

Telematics

Embedded Timestamping

or V

BAT

_______________________________________________________________ Maxim Integrated Products 1

appears at end of data sheet.

General Description

Applications

Low-Current SPI/3-Wire RTCs

S Low Timekeeping Current of 250nA (typ)

S Compatible with Crystal ESR Up to 100kI

S Versions Available to Support Either 6pF or

S RTC Counts Seconds, Minutes, Hours, Day, Date,

S Power-Fail and Switch Circuitry

S Three Operating Voltages

S Trickle-Charge Capability

S Maintain Time Down to 1.15V (typ)

S Support Motorola SPI Modes 1 and 3, or Standard

S Burst Mode for Reading/Writing Successive

S 96-Byte Battery-Backed NV RAM for Data Storage

S Two Time-of-Day Alarms with Two Interrupt

S Industrial Temperature Range

S 20-Pin TSSOP or 14-Pin TDFN Package

12.5pF Crystals

Month, and Year with Leap Year Compensation

Valid Through 2099

3-Wire Interface

Addresses in Clock/RAM

Outputs

1.8V ±5%

3.0V±10%

3.3V ±10%

NOTE: SHOWN IN 3-WIRE I/O CONFIGURATION.

3-WIRE

PORT

RST

INT

Typical Operating Circuit

INT0

INT1

SCLK

SDI

SDO

SERMODE

DS1343

DS1344

GND

BAT

Features

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