DS1340-18_03 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1340-18_03

2-Wire RTC with Trickle Charger

Dallas Semiconductor -> Maxim Integrated 

Rev 0; 6/03

2-Wire RTC with Trickle Charger

General Description

The DS1340 is a real-time clock (RTC)/calendar that is

pin compatible and functionally equivalent to the ST

M41T00, including the software clock calibration. The

device additionally provides trickle-charge capability

on the VBACKUP pin, a lower timekeeping voltage, and

an oscillator STOP flag. Block access of the register

map is identical to the ST device. Two additional regis-

ters, which are accessed individually, are required for

the trickle charger and flag. The clock/calendar pro-

vides seconds, minutes, hours, day, date, month, and

year information. A built-in power-sense circuit detects

power failures and automatically switches to the back-

up supply. The device is programmed serially through

a 2-wire bidirectional bus.

Portable Instruments

Point-of-Sale Equipment

Medical Equipment

Telecommunications

Applications

Typical Operating Circuit

Features

♦ Enhanced Second Source for the ST M41T00

♦ Fast (400kHz) 2-Wire Interface

♦ Software Clock Calibration

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

Month, and Year

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Trickle-Charge Capability

♦ Low Timekeeping Voltage Down to 1.3V

♦ Three Operating Voltage Ranges (1.8V, 3V, and

3.3V)

♦ Oscillator Stop Flag

♦ Available in 8-Pin µSOP or SO Packages

PART

DS1340Z-18

DS1340Z-3

DS1340Z-33

DS1340U-18

DS1340U-3

DS1340U-33

Ordering Information

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PIN-

PACKAGE

8 SO (0.150in)

8 SO (0.150in)

8 SO (0.150in)

TOP

MARK

D1340-18

DS1340-3

D1340-33

-40°C to +85°C 8 µSOP

1340

A1-18

-40°C to +85°C 8 µSOP

1340

A1-3

-40°C to +85°C 8 µSOP

1340

A1-33

VCC RPU

VCC

CRYSTAL

RPU

1

2

X1 X2

6 SCL

VCC

8

VCC

7

FT/OUT

CPU

RPU = tR / CB

5 SDA

DS1340

3

VBACKUP

GND

4

TOP VIEW

Pin Configuration

X1 1

X2 2

VBACKUP 3

GND 4

DS1340

8 VCC

7 FT/OUT

6 SCL

5 SDA

SO, µSOP

______________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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