Datasheet > 微控制器和处理器 > 计时器或实时时钟> MAX6916EO33

MAX6916EO33

更新时间： 2024-09-16 11:15:03

品牌	Logo	应用领域
美信 - MAXIM		微处理器监控控制器
页数	文件大小	规格书
28页	332K
描述
SPI-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller

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数据手册

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MAX6916EO33 数据手册

19-3694; Rev 0; 10/05

SPI-Compatible RTC with Microprocessor

Supervisor, Alarm, and NV RAM Controller

General Description

Features

The MAX6916 provides all the features of a real-time

clock (RTC) plus a microprocessor supervisory circuit,

NV RAM controller, and backup-battery monitor func-

tion. In addition, 96 x 8 bits of static RAM are available

for scratchpad storage. The MAX6916 communicates

with a microprocessor through an SPI™-bus-compati-

ble serial interface.

ꢀ Real-Time Clock Counts

Seconds, Minutes, Hours, Date, Month, Day of

Week, and Year with Leap-Year Compensation

Through 2099

ꢀ 4MHz SPI-Bus-Compatible Interface at 5V, 2MHz

at 3V, and 3.3V

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.

ꢀ SPI Interface Supports Modes 1 and 3 (0, 1 and 1, 1)

ꢀ 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

The microprocessor supervisory circuit features an

open-drain, active-low reset available in three different

reset thresholds. A manual reset input and a watchdog

function are included as well.

ꢀ Battery Monitor and Low-Battery Warning Output

Internal Default for Lithium Backup-Battery

Testing

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.

Pins Available for Other Backup-Battery

Testing Configurations

ꢀ Dual Power-Supply Pins for Primary and Backup

Power

ꢀ Battery-On Output

The battery-test circuitry periodically tests the backup

battery for a low-battery condition. An optional external

resistor network selects different battery thresholds. A

ꢀ NV RAM Controller

Chip-Enable Gating (Control of CE with Reset

and Power Valid)

freshness seal prevents battery drain until the first V

power-up.

for SRAM Power

OUT

The MAX6916 has a crystal-fail-detect circuit and a

data-valid bit. The MAX6916 is available in a 20-pin

QSOP package and is guaranteed to operate over the

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

ꢀ µP Supervisor with Watchdog Input

ꢀ Programmable Time/Date Alarm Output

ꢀ Data Valid Bit (Loss of All Voltage Alerts User of

Applications

Corrupt Data)

Point-of-Sale Equipment

Programmable Logic Controllers

Intelligent Instruments

Fax Machines

ꢀ Crystal-Fail Detect

ꢀ Small 20-Pin, QSOP Surface-Mount Package

Ordering Information

Digital Thermostats

PIN-

PACKAGE

PKG

CODE

Industrial Controls

PART

TEMP RANGE

MAX6916EO30+

MAX6916EO33+

MAX6916EO50+

-40°C to +85°C

20 QSOP

E20-2

Pin Configuration and Selector Guide appear at end of data

sheet.

+Denotes lead-free package.

SPI is a trademark of Motorola, Inc.

________________________________________________________________ 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.

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与MAX6916EO33相关器件

型号	品牌	获取价格	描述	数据表
MAX6916EO33+	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, MO-1
MAX6916EO33+T	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, MO-1
MAX6916EO50	MAXIM	获取价格	SPI-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller
MAX6916EO50+	MAXIM	获取价格	暂无描述
MAX6916EO50+T	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, MO-1
MAX6917_05	MAXIM	获取价格	I2C-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller
MAX6917EO30	MAXIM	获取价格	I2C-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller
MAX6917EO30+	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, MO-1
MAX6917EO30+T	MAXIM	获取价格	暂无描述
MAX6917EO30-T	MAXIM	获取价格	Timer or RTC, Non-Volatile, CMOS, PDSO20

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