MAX6917EO50+

更新时间： 2024-11-06 13:11:03

品牌	Logo	应用领域
美信 - MAXIM		计时器或实时时钟微控制器和处理器外围集成电路微处理器光电二极管监控
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数据手册

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MAX6917EO50+ 数据手册

19-3702; Rev 1; 10/05

I C-Compatible RTC with Microprocessor

Supervisor, Alarm, and NV RAM Controller

General Description

Features

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-

♦ Real-Time Clock Counts

Seconds, Minutes, Hours, Date,

Month, Day of Week, and Year

with Leap-Year Compensation Through 2099

cates with a µP through an I C-bus-compatible serial

♦ Fast (400kHz) I C-Bus-Compatible Interface

interface.

♦ 96 x 8 Bits of RAM for Scratchpad Data Storage

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.

♦ 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

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.

Pins Available for Other Backup-Battery

Testing Configurations

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.

♦ Dual Power-Supply Pins for Primary and Backup

Power

♦ Battery-On Output

♦ NV RAM Controller

The battery-test circuitry periodically tests the backup

battery for a low-battery condition. An optional external

resistor network selects different battery thresholds. A

Chip-Enable Gating (Control of CE with Reset

and Power Valid)

V_OUTfor SRAM Power

freshness seal prevents battery drain until the first V

power-up.

♦ Microprocessor Supervisor with Watchdog Input

♦ Programmable Time/Date Alarm Output

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.

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

Corrupt Data)

♦ Crystal-Fail Detect

Applications

♦ Reference Output Frequencies—1Hz and

Point-of-Sale Equipment

Programmable Logic Controllers

Intelligent Instruments

Fax Machines

32.768kHz

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

Digital Thermostats

Ordering Information

Industrial Control

PIN-

PACKAGE

PKG

CODE

PART

TEMP RANGE

Pin Configuration and Selector Guide appear at end of data

sheet.

MAX6917EO30+

MAX6917EO33+

MAX6917EO50+

-40°C to +85°C 20 QSOP

E20-2

+Denotes lead-free package.

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...31

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与MAX6917EO50+相关器件

型号	品牌	获取价格	描述	数据表
MAX6917EO50-T	MAXIM	获取价格	Timer or RTC, Non-Volatile, CMOS, PDSO20
MAX691A	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691A	ADI	获取价格	微处理器监控电路
MAX691A/MAX693A/MAX800L/MAX800M	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691A_08	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691AC	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691AC/D	MAXIM	获取价格	Power Supply Supervisor
MAX691ACPE	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691ACSE	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX691ACSE+T	MAXIM	获取价格	Power Supply Management Circuit, Adjustable, 1 Channel, CMOS, PDSO16, SO-16

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