BQ3287AMT-I

更新时间： 2024-01-05 02:36:37

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光电二极管
页数	文件大小	规格书
6页	79K
描述
Real-Time Clock RTC Module

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技术参数
数据手册

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BQ3287AMT-I 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

BQ3287AMT-I 数据手册

bq3287/bq3287A

(

)

Real-Time Clock RTC Module

➤ Calendar in day of the week, day

of the month, months, and years

with automatic leap-year adjust-

ment

bq3287A version is identical to the

bq3287, with the addition of the RAM

clear input.

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

The bq3287 is a fully compatible

r e a l-t im e clock for I B M AT-

compatible computers and other ap-

p lica t ion s . T h e b q 3 2 8 7 w r it e -

pr ot ect s t h e clock, ca len da r, a n d

storage registers during power fail-

u r e. Th e in t egr a l ba cku p en er gy

source then maintains data and op-

erates the clock and calendar.

➤ Programmable square wave out-

➤ Functionally compatible with the

put

DS1287/DS1287A and MC146818A

➤ Three individually maskable in-

➤ 114 bytes of general nonvolatile

terrupt event flags:

storage

- ^{Periodic rates from 122}^µ^{s to}

➤ Integral lithium cell and crystal

500 ms

➤ 160 ns cycle time allows fast bus

As shipped from Benchma rq, the

real time clock is turned off to maxi-

mize battery capacity for in-system

operation.

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

operation

second to once per day

➤ Selectable Intel or Motorola bus

timing

- ^{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

➤ 14 bytes for clock/calendar and

The bq3287 is functionally equiva-

lent to the bq3285, except that the

battery (16, 20) and crystal (2, 3)

pins 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

retention 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 bq3285 data sheet.

control

month clock accuracy

➤ BCD or binary format for clock

and calendar data

General Description

➤ Time of day in seconds, minutes,

Th e CMOS bq3287/bq3287A 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 114 bytes of gen-

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

and hours

- ^{12- or 24-hour format}

- Optional daylight saving

adjustment

Pin Connections

Pin Names

AD₀–AD₇Multiplexed address/data

RST

SQW

Reset input

input/output

MOT

Square wave output

No connect

MOT

Bus type select input

Chip select input

SQW

NC/RCL

RCL

RAM clear input

(bq3287A only)

Address strobe input

Data strobe input

INT

RST

V_CC

V_SS

+5V supply

Ground

R/W

INT

Read/write input

R/W

Interrupt request output

24-Pin DIP Module

PN328701.eps

Sept. 1996 D

12 3 4 5 6

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