Datasheet > 微控制器和处理器 > 计时器或实时时钟> BQ4287MT-SB2

BQ4287MT-SB2

更新时间： 2024-09-14 12:53:43

品牌	Logo	应用领域
德州仪器 - TI		计时器或实时时钟微控制器和处理器外围集成电路
页数	文件大小	规格书
10页	376K
描述
Real-Time Clock Module With NVRAM Control

阅读下载

中文翻译

获取价格

技术参数
数据手册
替代型号

如果您发现信息不准确，欢迎纠错

BQ4287MT-SB2 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	DMA
包装说明：	ROHS COMPLIANT, PLASTIC, MODULE, DIP-24	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.81
Is Samacsys：	N	外部数据总线宽度：	8
信息访问方法：	PARALLEL, MUXED BUS	中断能力：	Y
JESD-30 代码：	R-XDMA-T24	端子数量：	24
计时器数量：	1	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	UNSPECIFIED
封装代码：	DIP	封装等效代码：	DIP24,.6
封装形状：	RECTANGULAR	封装形式：	MICROELECTRONIC ASSEMBLY
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	5 V
认证状态：	Not Qualified	子类别：	Timer or RTC
最大供电电压：	5.5 V	最小供电电压：	4.5 V
标称供电电压：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	最短时间：	SECONDS
处于峰值回流温度下的最长时间：	NOT SPECIFIED	易失性：	NO
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

BQ4287MT-SB2 数据手册

Not Recommended For New Designs

bq4287

Real-Time Clock Module With NVRAM Control

Features

➤ Time of day in seconds, minutes,

114 byt es of gen er a l n on vola t ile

storage.

and hours

➤ Direct clock/calendar replace-

ment for IBM®

- ^{12- or 24-hour format}

The bq4287 write-protects the clock,

calendar, and storage registers dur-

in g p ower fa ilu r e. Th e in t egr a l

backup energy source then main-

tains data and operates the clock

and calendar.

- ^{Optional daylight saving}

AT-compatible computers and

other applications

adjustment

➤ Programmable square wave out-

➤ Functionally compatible with the

DS1287/DS1287A and

MC146818A

put

➤ Three individually maskable in-

The bq4287 uses its integral battery-

backup controller and battery to make

a standard CMOS SRAM nonvolatile

during power-fail conditions. During

power-fail, the bq4287 automatically

write-protects the external SRAM and

provides a V_CCoutput sourced from its

internal battery.

terrupt event flags:

➤ 114 bytes of general nonvolatile

storage

- ^{Periodic rates from 122}^µ^{s to}

500 ms

➤ Automatic backup supply and

write-protection to make external

SRAM nonvolatile

- ^{Time-of-day alarm once per}

second to once per day

- ^{End-of-clock update cycle}

➤ Integral lithium cell and crystal

The bq4287 is a fully compatible

real-time clock for IBM AT-compatible

computers and other applications.

➤ Better than one minute per

➤ 160 ns cycle time allows fast bus

month clock accuracy

operation

➤ Intel bus timing

General Description

As shipped from Benchma rq, the

backup cell is electrically isolated

from the memory. Following the first

application of V_CC, this isolation is

broken, and the backup cell provides

data retention to the clock, internal

RAM, V_OUT, and CE_OUTon subse-

quent power-downs.

➤ 14 bytes for clock/calendar and

control

The CMOS bq4287 is a low-power

microprocessor peripheral providing

a time-of-day clock and 100-year cal-

endar with alarm features and bat-

tery operation. Other features in-

clu de t h r ee m a sk a ble in t er r u pt

sources, square wave output, and

➤ BCD or binary format for clock

and calendar data

➤ Calendar in day of the week, day of

the month, months, and years with

automatic leap-year adjustment

The bq4287 is functionally equiva-

lent to the bq4285, except that the

battery (16, 20) and crystal pins (2,

3) are not accessible. These pins are

connected internally to a coin cell

and quartz crystal. The coin cell pro-

vides 130m Ah of ca pa cit y. For a

complete description of features, op-

erating conditions, electrical charac-

teristics, bus timing, and pin de-

scr ipt ion s, see t h e bq4285 da t a

sheet.

Pin Connections

Pin Names

AD₀–AD₇

Multiplexed address/data

input/output

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

OUT

SQW

ALE

OUT

INT

RST

SQW

CE_IN

CE_OUT

INT

RST

Caution:

Square wave output

RAM chip enable input

RAM chip enable output

No connect

Take care to avoid inadvertent dis-

charge through V_OUTand CE_OUT

after battery isolation has been

broken.

ALE

24-Pin DIP Module

V_OUT

V_CC

V_SS

Supply output

PN428701.eps

+5V supply

Ground

Nov. 1993 C

12 3 4 5 6 7...10

中文翻译

下载PDF

BQ4287MT-SB2 替代型号

型号	品牌	替代类型	描述	数据表
BQ4285P-SB2	TI	完全替代	Real-Time Clock RTC With NVRAM Control

与BQ4287MT-SB2相关器件

型号	品牌	获取价格	描述	数据表
BQ4311LSH-N100	TI	获取价格	32KX8 NON-VOLATILE SRAM MODULE, 100ns, DMA28, SNAPHAT MODULE-28
BQ4311YSH-N70	TI	获取价格	32KX8 NON-VOLATILE SRAM MODULE, 70ns, DMA28, SNAPHAT MODULE-28
BQ-4704701%	VISHAY	获取价格	General Purpose Inductor, 470uH, 1%, 1 Element, Ferrite-Core
BQ-47047010%	VISHAY	获取价格	General Purpose Inductor, 470uH, 10%, 1 Element, Ferrite-Core
BQ-4704703%	VISHAY	获取价格	General Purpose Inductor, 470uH, 3%, 1 Element, Ferrite-Core
BQ-4704705%	VISHAY	获取价格	General Purpose Inductor, 470uH, 5%, 1 Element, Ferrite-Core
BQ-47471%	VISHAY	获取价格	General Purpose Inductor, 47uH, 1%, 1 Element, Ferrite-Core
BQ-474710%	VISHAY	获取价格	General Purpose Inductor, 47uH, 10%, 1 Element, Ferrite-Core
BQ-47473%	VISHAY	获取价格	General Purpose Inductor, 47uH, 3%, 1 Element, Ferrite-Core
BQ-47475%	VISHAY	获取价格	General Purpose Inductor, 47uH, 5%, 1 Element, Ferrite-Core

与BQ4287MT-SB2相关文章

贸泽上架Tallysman TW5386智能GNSS天线，助力机器人与精确计时应用
2024-09-18

0
SL74HC10N：高性能三输入与非门解析
2024-09-03

81
AIC1781A 电池充电控制器深度解析
2024-09-03

72
Pickering新高压舌簧继电器亮相汽车测试博览会
2024-08-26

101

产品中心

服务支持

精选活动

关于我们

帮助中心

BQ4287MT-SB2

BQ4287MT-SB2 技术参数

BQ4287MT-SB2 数据手册

BQ4287MT-SB2 替代型号

与BQ4287MT-SB2相关器件

与BQ4287MT-SB2相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

BQ4287MT-SB2

BQ4287MT-SB2 技术参数

BQ4287MT-SB2 数据手册

BQ4287MT-SB2 替代型号

与BQ4287MT-SB2相关器件

与BQ4287MT-SB2相关文章

您还可以找

您在本页遇到什么问题？