Datasheet > BQ3285LC

BQ3285LC

更新时间： 2024-10-27 23:35:35

品牌	Logo	应用领域
其他 - ETC		时钟
页数	文件大小	规格书
26页	832K
描述
Real-Time Clock (RTC)

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中文翻译

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数据手册

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BQ3285LC 数据手册

bq3285EC/LC

(

)

Real-Time Clock RTC

in battery-backup mode. In battery

backup mode, current drain is less

than 500nA.

Features

General Description

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

The CMOS bq3285EC/LC is a low-

power microprocessor peripheral pro-

viding a time-of-day clock and 100-

year calendar with alarm features

and battery operation. The architec-

ture is based on the bq3285/7 RTC

with added features: low-voltage op-

eration, 32.768kHz output, and an

extra 128 bytes of CMOS.

The bq3285EC/LC write-protects the

clock, calendar, and storage registers

du r in g power fa ilu r e. A ba cku p

battery then maintains data and oper-

ates the clock and calendar.

➤ 2.7–5.5V operation (bq3285LC);

4.5–5.5V operation (bq3285EC)

➤ 242 bytes of general nonvolatile

The bq3285EC/LC is a fully com-

patible 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.

storage

➤ Dedicated 32.768kHz output pin

A 32.768kHz output is available for

sustaining power-management ac-

tivities. The bq3285EC 32kHz out-

put is always on whenever V_CCis

valid. For the bq3285LC, the output

is on when the oscillator is turned

on . I n V_{C C}s t a n d by m od e, t h e

32kHz is active, and the bq3285LC

t ypica lly dr a ws 100µA wh ile t h e

bq3285EC typically draws 300µA.

Wake-up capability is provided by

an alarm interrupt, which is active

➤ System wake-up capability—

alarm interrupt output active in

battery-backup mode

The bq3285EC is intended for use in

5V systems. The bq3285LC is in-

tended for use in 3V systems; the

bq3285LC, however, may also oper-

ate at 5V and then go into a 3V

power-down state, write-protecting

as if in a 3V system.

➤ Less than 0.5µA load under bat-

tery operation

➤ Selectable Intel or Motorola bus

timing

➤ 24-pin plastic SOIC or SSOP

Pin Connections

Pin Names

AD₀–AD₇Multiplexed address/

data input/output

32K

32.768kHz output

EXTRAM Extended RAM enable

MOT

Bus type select input

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

32k

EXTRAM

RCL

RAM clear input

3V backup cell input

Crystal inputs

Power supply

Ground

RCL

INT

RST

R/W

X1–X2

V_CC

R/W

INT

RST

V_SS

24-Pin SSOP

PN3285EC.eps

July 1996

12 3 4 5 6 7...26

中文翻译

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与BQ3285LC相关器件

型号	品牌	获取价格	描述	数据表
BQ3285LCS	ETC	获取价格	Real-Time Clock
BQ3285LCSS	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LCSS-	TI	获取价格	Real-Time Clock (RTC)
BQ3285LCSSTR	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LD	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSS	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSSTR	TI	获取价格	Real-Time Clock (RTC)
BQ3285LF	TI	获取价格	Y2K-Enhanced Real-Time Clock (RTC)
BQ3285LFSS	TI	获取价格	0 TIMER(S), REAL TIME CLOCK, PDSO24, 0.150 INCH, PLASTIC, SSOP-24
BQ3285LF-SS	TI	获取价格	Y2K-Enhanced Real-Time Clock (RTC)

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