MAX6917_05 datasheet(1/31 Pages) MAXIM

Part #	MAX6917

Description	I2C-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller

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Manufacturer	MAXIM [Maxim Integrated Products]

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General Description

The MAX6917 provides all the features of a real-time

clock (RTC) plus a microprocessor (µP) supervisory cir-

cuit, NV RAM controller, and backup-battery monitor

function. In addition, 96 x 8 bits of static RAM are avail-

able for scratchpad storage. The MAX6917 communi-

cates with a µP through an I2C-bus-compatible serial

interface.

The real-time clock/calendar provides seconds, min-

utes, 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 years through 2099. The clock operates in

either 24hr or 12hr format with an AM/PM indicator. A

time/date-programmable alarm function is provided

with an open-drain, active-low alarm output.

The µP supervisory circuit features an open-drain,

active-low reset available in three different reset thresh-

olds. A manual reset input and a watchdog function are

included as well.

The NV RAM controller provides power for external SRAM

from a backup battery plus chip-enable gating. The back-

up battery also provides data retention of the on-board 96

x 8 bits of RAM. An open-drain, active-low, battery-on sig-

nal alerts the system when operating from a battery.

The battery-test circuitry periodically tests the backup

battery for a low-battery condition. An optional external

resistor network selects different battery thresholds. A

freshness seal prevents battery drain until the first VCC

power-up.

The MAX6917 has a crystal-fail-detect circuit and a

data-valid bit. The MAX6917 is available in a 20-pin

QSOP package and is guaranteed to operate over the

extended (-40°C to +85°C) temperature range.

Applications

Point-of-Sale Equipment

Programmable Logic Controllers

Intelligent Instruments

Fax Machines

Digital Thermostats

Industrial Control

Features

♦ Real-Time Clock Counts

Seconds, Minutes, Hours, Date,

Month, Day of Week, and Year

with Leap-Year Compensation Through 2099

♦ Fast (400kHz) I2C-Bus-Compatible Interface

♦ 96 x 8 Bits of RAM for Scratchpad Data Storage

♦ Uses Standard 32.768kHz, 6pF Load, Watch

Crystal

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

Transfer for Read or Write of Clock Registers or

RAM

♦ Battery Monitor and Low-Battery Warning Output

Internal Default for Lithium Backup-Battery

Testing

Pins Available for Other Backup-Battery

Testing Configurations

♦ Dual Power-Supply Pins for Primary and Backup

Power

♦ Battery-On Output

♦ NV RAM Controller

Chip-Enable Gating (Control of

CE with Reset

and Power Valid)

VOUT for SRAM Power

♦ Microprocessor Supervisor with Watchdog Input

♦ Programmable Time/Date Alarm Output

♦ Data Valid Bit (Loss of All Voltage Alerts User of

Corrupt Data)

♦ Crystal-Fail Detect

♦ Reference Output Frequencies—1Hz and

32.768kHz

♦ Small, 20-Pin, QSOP Surface-Mount Package

I2C-Compatible RTC with Microprocessor

Supervisor, Alarm, and NV RAM Controller

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3702; Rev 1; 10/05

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.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX6917EO30+

-40°C to +85°C

20 QSOP

E20-2

MAX6917EO33+

-40°C to +85°C

20 QSOP

E20-2

MAX6917EO50+

-40°C to +85°C

20 QSOP

E20-2

Pin Configuration and Selector Guide appear at end of data

sheet.

+Denotes lead-free package.

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