BQ3287E

更新时间： 2024-01-09 20:31:57

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
7页	95K
描述
Real-Time Clock RTC Module

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技术参数
数据手册

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BQ3287E 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	unknown	风险等级：	5.89
信息访问方法：	PARALLEL	中断能力：	Y
JESD-30 代码：	R-PDIP-T24	JESD-609代码：	e0
端子数量：	24	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP24,.6
封装形状：	RECTANGULAR	封装形式：	IN-LINE
电源：	5 V	认证状态：	Not Qualified
子类别：	Timer or RTC	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	最短时间：	SECONDS
易失性：	NO	Base Number Matches：	1

BQ3287E 数据手册

bq3287E/bq3287EA

(

)

Real-Time Clock RTC Module

vided by an alarm interrupt, which is

➤ Calendar in day of the week, day

active in battery-backup mode. The

of the month, months, and years

bq3287EA version is identical to the

with automatic leap-year adjust-

bq3287E, with the addition of the

ment

Features

➤ Dir ect clock/ca len da r r epla ce-

m en t for IBM^®AT-com pa t ible

computers and other applications

RAM clear input.

➤ Programmable square wave out-

The bq3287E is a fully compatible

put

➤ F u n ct ion a lly com pa t ible wit h

t h e D S 1 2 8 7 /D S 1 2 8 7 A a n d

MC146818A/ MC146818B

real-time clock for IBM AT-compatible

computers and other applications. The

➤ Three individually maskable in-

bq3287E write-protects the clock, cal-

endar, and storage registers during

power failure. The integral backup en-

ergy source then maintains data and

operates the clock and calendar.

terrupt event flags:

➤ 242 bytes of general nonvolatile

storage

- ^{Periodic rates from 122µs to}

500ms

➤ Provides a 32.768kHz output for

power management

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

As shipped from Benchma rq, the

real time clock is turned off to maxi-

mize battery capacity for in-system

operation.

➤ System wake-up capability—

a la r m in t e r r u p t a ct ive in

battery-backup mode

second to once per day

- ^{End-of-clock update cycle}

➤ B e t t e r t h a n on e m in u t e p e r

➤ Integral lithium cell and crystal

The bq3287E is functionally equiva-

lent to the bq3285E, except the bat-

tery (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 is

sized to provide 10 years of data re-

tention and clock operation in the

absence of power. For a complete de-

scription of features, operating con-

dit ion s, elect r ica l ch a r a ct er ist ics,

bus timing, and pin descriptions, see

the bq3285E data sheet.

month clock accuracy

➤ 160 ns cycle time allows fast bus

operation

General Description

➤ 14 bytes for clock/calendar and

control

The CMOS bq3287E/bq3287EA is a

low-power microprocessor periph-

eral providing a time-of-day clock

and 100-year calendar with alarm

fea t u r es a n d ba t t er y oper a t ion .

O t h e r fe a t u r e s in clu d e t h r e e

maskable interrupt sources, square-

wave output, and 242 bytes of gen-

➤ Time of day in seconds, minutes,

and hours

- ^{12- or 24-hour format}

- Optional daylight saving

adjustment

e r a l n on vola t ile s t or a ge.

32.768kHz output is available for

sustaining power-management ac-

tivities. Wake-up capability is pro-

Pin Connections

Pin Names

AD0–AD7 Multiplex address/data

RST

Reset input

MOT

input/output

SQW

EXTRAM

SQW

Square wave output

MOT

NC/RCL

EXTRAM Extended RAM enable

Chip select input

INT

No connect

RST

Address strobe input

Data strobe input

RCL

RAM clear input

(bq3287EA only)

R/W

INT

Read/write input

V_CC

V_SS

+5V supply

Ground

24-Pin DIP Module

Interrupt request output

PN3287E1.eps

Sept. 1996 C

12 3 4 5 6 7

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与BQ3287E相关器件

型号	品牌	描述	获取价格	数据表
BQ3287E_14	TI	Real-Time Clock (RTC) Module	获取价格
BQ3287EA	TI	Real-Time Clock (RTC) Module	获取价格
BQ3287EAMT	TI	Real-Time Clock RTC Module	获取价格
BQ3287EMT	TI	Real-Time Clock RTC Module	获取价格
BQ3287LDMT	TI	0 TIMER(S), REAL TIME CLOCK, DMA24, MODULE, DIP-24	获取价格
BQ3287MT	TI	1 TIMER(S), REAL TIME CLOCK, PDIP24	获取价格

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