BQ4285LSTR

更新时间： 2024-11-10 21:53:31

品牌	Logo	应用领域
德州仪器 - TI		外围集成电路光电二极管时钟
页数	文件大小	规格书
32页	1565K
描述
Enhanced RTC With NVRAM Control

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中文翻译

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技术参数
数据手册

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BQ4285LSTR 技术参数

是否无铅：	含铅	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOIC-24
针数：	24	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.83	Is Samacsys：	N
最大时钟频率：	0.032 MHz	外部数据总线宽度：	8
信息访问方法：	PARALLEL, MUXED BUS	JESD-30 代码：	R-PDSO-G24
长度：	15.4 mm	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：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
座面最大高度：	2.65 mm	最大供电电压：	3.6 V
最小供电电压：	2.7 V	标称供电电压：	3.15 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	7.5 mm	uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK
Base Number Matches：	1

BQ4285LSTR 数据手册

bq4285E/L

Enhanced RTC With NVRAM Control

➤ BCD or binary format for clock

General Description

and calendar data

Features

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

The CMOS bq4285E/L is a low-power

microprocessor peripheral providing a

time-of-day clock and 100-year calen-

dar with alarm features and battery

operation. Other features include

three maskable interrupt sources,

square wave output, and 114 bytes of

general nonvolatile storage.

➤ Calendar in day of the week, day

of the month, months, and years,

with automatic leap-year adjust-

ment

➤ 114 bytes of general nonvolatile

storage

➤ Time of day in seconds, minutes,

and hours

➤ Enhanced features include:

- ^{12- or 24-hour format}

- ^{System wake-up capability—}

alarm interrupt output active

in battery-backup mode

- ^{Optional daylight saving}

A 32.768kHz output is available for

sustaining power-management activi-

ties. Wake-up capability is provided by

an alarm interrupt, which is active in

battery-backup mode.

adjustment

- ^{2.7–3.6V operation (bq4285L);}

➤ Programmable square wave out-

4.5–5.5V operation (bq4285E)

put

- ^{32kHz output for power}

➤ Three individually maskable in-

The bq4285E/L write-protects the

clock, calendar, and storage registers

during power failure. A backup bat-

tery then maintains data and oper-

ates the clock and calendar.

management

terrupt event flags:

➤ Automatic backup and write-

- Periodic rates from 122µs to

protect control to external SRAM

500ms

➤ Functionally compatible with the

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

DS1285

second to once per day

The bq4285E/L is a fully compatible

real-time clock for IBM AT-

compatible computers and other ap-

plications. The only external compo-

nents are a 32.768kHz crystal and a

backup battery.

- End-of-clock update cycle

➤ 24-pin plastic DIP or SOIC

➤ Less than 0.5 µA load under bat-

tery operation

The bq4285E/L integrates

battery-backup controller to make a

➤ 14 bytes for clock/calendar and

control

Pin Names

Pin Connections

AD₀–AD₇Multiplexed address/data

input/output

MOT

Bus type select input

OUT

SQW

R/W

INT

RST

SQW

X1–X2

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

Square wave output

3V backup cell input

Crystal inputs

OUT

INT

RST

R/W

No connect

CE_IN

CE_OUT

V_OUT

V_CC

RAM chip enable input

RAM chip enable output

Supply output

28-Pin PLCC: No Longer Available

24-Pin DIP or SOIC

PN428501.eps

+5V supply

SLUS006A - MAY 1994 - REVISED MAY 2004

12 3 4 5 6 7...32

中文翻译

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与BQ4285LSTR相关器件

型号	品牌	获取价格	描述	数据表
BQ4285P-	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285P-SB2	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285Q	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PQCC28
BQ4285Q-	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285S-	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285S-SB2	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285S-SB2TR	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4287	TI	获取价格	Real-Time Clock Module With NVRAM Control
BQ4287EMT	ETC	获取价格	Real-Time Clock
BQ4287EMT-N	ETC	获取价格	Real-Time Clock

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