DS1374C-3#【PDF 1/18 页】IC RTC I2C W/CHARGER 16-SOIC

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Sheet目录1993

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General Description

The DS1374 is a 32-bit binary counter designed to contin-

uously count time in seconds. An additional counter gen-

erates a periodic alarm or serves as a watchdog timer. If

disabled, this counter can be used as 3 bytes of non-

volatile (NV) RAM. Separate output pins are provided for

an interrupt and a square wave at one of four selectable

frequencies. A precision temperature-compensated refer-

ence and comparator circuit monitor the status of VCC to

detect power failures, provide a reset output, and auto-

matically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton

input for externally generating a reset. The device is pro-

grammed serially through an I2C serial interface.

Applications

Portable Instruments

Point-of-Sale Equipment

Medical Equipment

Telecommunications

Features

32-Bit Binary Counter

Second Binary Counter Provides Time-of-Day

Alarm, Watchdog Timer, or NV RAM

Separate Square-Wave and Interrupt Output Pins

I2C Serial Interface

Automatic Power-Fail Detect and Switch Circuitry

Single-Pin Pushbutton Reset Input/Open-Drain

Reset Output

Low-Voltage Operation

Trickle-Charge Capability

-40°C to +85°C Operating Temperature Range

10-Pin SOP, 16-Pin SO

Available in a Surface-Mount Package with an

Integrated Crystal (DS1374C)

Underwriters Laboratories (UL) Recognized

DS1374

I2C, 32-Bit Binary Counter Watchdog RTC with

Trickle Charger and Reset Input/Output

______________________________________________

Maxim Integrated Products

Ordering Information

DS1374

CRYSTAL

VCC

SQW

SCL

SDA

INT

RST

INT

RST

GND

VBACKUP

VCC

N.O.

PUSHBUTTON

RESET

PRIMARY

BATTERY,

RECHARGEABLE

BATTERY, OR

SUPER CAPACITOR

CPU

RPU

RPU = tr/CB

RPU

Typical Operating Circuit

19-5484; Rev 4; 8/10

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.

PART

TEMP RANGE

VOLTAGE (V)

PIN-PACKAGE

TOP MARK**

DS1374C-18#

-40°C to +85°C

1.8

16 SO (300 mils)

DS1374C-18

DS1374C-3#

-40°C to +85°C

3.0

16 SO (300 mils)

DS1374C-3

DS1374C-33#

-40°C to +85°C

3.3

16 SO (300 mils)

DS1374C-33

DS1374U-18+

-40°C to +85°C

1.8

10 μSOP

DS1374-18

DS1374U-3+

-40°C to +85°C

3.0

10 μSOP

DS1374-3

DS1374U-33+

-40°C to +85°C

3.3

10 μSOP

DS1374-33

Pin Configurations appear at the end of the data sheet.

Denotes a RoHS-compliant device that may include lead that is exempt under RoHS requirements. The lead finish is JESD97 category

e3, and is compatible with both lead-based and lead-free soldering processes.

Denotes a lead(Pb)-free/RoHS-compliant package.

A "#" anywhere on the top mark denotes a RoHS-compliant package. A “+” anywhere on the top mark denotes a lead(Pb)-free

package.

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