DS1340-18(2006) 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1340-18
(Rev.:2006)

I2C RTC with Trickle Charger

Dallas Semiconductor -> Maxim Integrated 

Rev 4; 3/06

I2C 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. Reads and writes are inhibited while the

clock continues to run. The device is programmed seri-

ally through an I2C* bidirectional bus.

Portable Instruments

Point-of-Sale Equipment

Medical Equipment

Telecommunications

Applications

Typical Operating Circuit

VCC

VCC

CRYSTAL

VCC RPU

RPU

1

2

8

C1

X1 X2

6 SCL

VCC

7

FT/OUT

CPU

RPU = tR / CB

5 SDA

DS1340

3

VBACKUP

GND

4

*Purchase of I2C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I2C Patent Rights to use these com-

ponents in an I2C system, provided that the system conforms to

the I2C Standard Specification as defined by Philips.

Features

♦ Enhanced Second Source for the ST M41T00

♦ Available in a Surface-Mount Package with an

Integrated Crystal (DS1340C)

♦ Fast (400kHz) I2C 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

♦ Underwriters Laboratory (UL) Recognized

Ordering Information

PART

DS1340Z-18

DS1340Z-3

DS1340Z-33

DS1340U-18

DS1340U-3

DS1340U-33

DS1340C-18

DS1340C-3

DS1340C-33

DS1340Z-18+

TEMP RANGE

PIN-PACKAGE

TOP

MARK†

-40°C to +85°C 8 SO (0.150in) D1340-18

-40°C to +85°C 8 SO (0.150in) DS1340-3

-40°C to +85°C 8 SO (0.150in) D1340-33

-40°C to +85°C 8 µSOP

1340A1-18

-40°C to +85°C 8 µSOP

1340A1-3

-40°C to +85°C 8 µSOP

1340A1-33

-40°C to +85°C 16 SO

1340C-18

-40°C to +85°C 16 SO

1340C-3

-40°C to +85°C 16 SO

1340C-33

-40°C to +85°C 8 SO (0.150in) D1340-18

DS1340Z-3+ -40°C to +85°C 8 SO (0.150in)

DS1340Z-33+ -40°C to +85°C 8 SO (0.150in)

DS1340U-18+ -40°C to +85°C 8 µSOP

DS1340U-3+ -40°C to +85°C 8 µSOP

DS1340U-33+ -40°C to +85°C 8 µSOP

DS1340-3

D1340-33

1340A1-18

1340A1-3

1340A1-33

DS1340C-18# -40°C to +85°C 16 SO

DS1340C-3# -40°C to +85°C 16 SO

1340C-18

1340C-3

DS1340C-33# -40°C to +85°C 16 SO

1340C-33

+ Denotes a lead-free/RoHS-compliant device.

# 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.

† A "+" anywhere on the top mark denotes a lead-free device.

A "#" denotes a RoHS-compliant device.

Pin Configurations appear at end of data sheet.

______________________________________________ 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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