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Rainbow Electronics MAX6900 User Manual

Max6900 i, C-compatible rtc in a tdfn, General description

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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.

General Description

The MAX6900, I

2

C™-bus-compatible real-time clock

(RTC) in a 6-pin TDFN package contains a real-time
clock/calendar and 31-byte

8-bit wide of static ran-

dom access memory (SRAM). The real-time clock/cal-
endar provides seconds, minutes, hours, day, date,
month, and year information. The end of the month date
is automatically adjusted for months with fewer than 31
days, including corrections for leap year up to the year
2100. The clock operates in either the 24hr or 12hr for-
mat with an AM/PM indicator.

Applications

Portable Instruments

Point-of-Sale Equipment

Intelligent Instruments

Battery-Powered Products

Features

Real-Time Clock Counts Seconds, Minutes,

Hours, Date, Month, Day, and Year

Leap Year Compensation Valid up to Year 2100
Fast (400kHz) I

2

C-Bus-Compatible Interface from

2.0V to 5.5V

31

8 SRAM for Scratchpad Data Storage

Uses Standard 32.768kHz, 12.5pF Load, Watch

Crystal

Ultra-Low 225nA (typ) Timekeeping Current
Single-Byte or Multiple-Byte (Burst Mode) Data

Transfer for Read or Write of Clock Registers or
SRAM

6-Pin 3mm x 3mm x 0.8mm TDFN Surface-Mount

Package

No External Crystal Bias Resistors or Capacitors

Required

MAX6900

I

2

C-Compatible RTC in a TDFN

________________________________________________________________ Maxim Integrated Products

1

µC

RPU

RPU

0.01

µF

CRYSTAL

X1

SCL

SDA

5

2

3

4

1

6

X2

GND

RPU = t

r

/C

bus

V

CC

V

CC

V

CC

V

CC

MAX6900

19-1942; Rev 3; 6/03

Typical Operating Circuit

X1

GND

X2

1

6

SDA

5

SCL

V

CC

MAX6900

TDFN

TOP VIEW

2

3

4

Pin Configuration

Ordering Information

PART

TEMP RANGE

PIN-
PACKAGE

TOP

MARK

MAX6900ETT-T

-40

°C to +85°C

6 TDFN

AEU

Related Real-Time Clock Products

PART

SERIAL BUS

SRAM

ALARM

FUNCTION

OUTPUT

FREQUENCY

PIN-PACKAGE

MAX6900

I

2

C compatible

31

8

6 TDFN

MAX6901

3-wire

31

8

Polled

32kHz

8 TDFN

MAX6902

SPI™ compatible

31

8

Polled

8 TDFN

I

2

C is a trademark of Philips Corp. Purchase of I

2

C components

of Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I

2

C

Patent Rights to use these components in an I

2

C system, provid-

ed that the system conforms to the I

2

C Standard Specification

as defined by Philips.

SPI is a trademark of Motorola, Inc.