MAX6901 查看數據表（PDF） - Maxim Integrated

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MAX6901

3-Wire Serial RTC in a TDFN

Maxim Integrated 

19-2085; Rev 2; 5/04

3-Wire Serial RTC in a TDFN

General Description

The MAX6901 3-wire serial interface real-time clock in a

TDFN package contains a real-time clock/calendar and

31 x 8 bits of static RAM (SRAM). The real-time

clock/calendar provides seconds, minutes, hours, day,

date, month, year, and century information. A

time/date-programmable polled ALARM is included in

the MAX6901. The end of the month date is automati-

cally 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 format

with an AM/PM indicator. A push-pull 32kHz output is

also included. The MAX6901 operates with a supply

voltage of +2V to +5.5V, is available in the ultra-small 8-

pin TDFN package, and works over the industrial tem-

perature range, -40°C to +85°C.

Applications

Point-of-Sale Equipment

Intelligent Instruments

Fax Machines

Battery-Powered Products

Portable Instruments

Typical Operating Circuit

3.3V

0.1µF

3.3V

P1.0

µC P1.1

P1.2

CLKIN

2

VCC

1 SCLK MAX6901

7 CS

8 I/O

5 32KHZ

X1 4

X2 3

GND

6

32.768kHz

CRYSTAL

Features

♦ Real-Time Clock Counts Seconds, Minutes,

Hours, Day of Week, Date of Month, Month, Year,

and Century

♦ Leap-Year Compensation Valid up to Year 2100

♦ Wide +2V to +5.5V Operating Voltage Range

♦ 3-Wire Serial Interface, 2MHz at 5V, 500kHz at 2V

♦ 31 x 8-Bit SRAM for Scratchpad Data Storage

♦ Uses Standard 32.768kHz, 12.5pF Watch Crystal

♦ Low Timekeeping Current (400nA at 2V)

♦ Single-Byte or Multiple-Byte (Burst Mode)

Data Transfer for Read or Write of Clock

Registers or SRAM

♦ 8-Pin 3mm x 3mm x 0.8mm TDFN

Surface-Mount Package

♦ Push-Pull 32.768kHz Clock Output

♦ Programmable Time/Date Polled ALARM Function

♦ No External Crystal Bias Resistors or Capacitors

Required

Ordering Information

PART

MAX6901ETA-T

TEMP

RANGE

-40°C to +85°C

PIN-

PACKAGE

8 TDFN

TOP

MARK

AGV

Pin Configuration appears at end of data sheet.

Functional Diagram appears at end of data sheet.

Related Real-Time Clock Products

PART

MAX6900

MAX6901

MAX6902

SERIAL

INTERFACE

I2C compatible

3 wire

SPI™ compatible

Id

Cm

c.

SPI is a trademark of Motorola, Inc.

ALARM

(bits)

31 x 8

31 x 8

31 x 8

ALARM

FUNCTION

—

Polled

Polled

OUTPUT

FREQUENCY

—

32kHz

—

PIN-PACKAGE

6 TDFN

8 TDFN

8 TDFN

________________________________________________________________ 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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