BQ4285S-

更新时间： 2024-11-10 22:23:59

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
24页	1025K
描述
Real-Time Clock RTC With NVRAM Control

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中文翻译

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数据手册

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BQ4285S- 数据手册

bq4285

(

)

Real-Time Clock RTC With NVRAM Control

➤ Calendar in day of the week, day of

General Description

the month, months, and years, with

Features

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

automatic leap-year adjustment

The CMOS bq4285 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 include

three maskable interrupt sources,

square wave output, and 114 bytes of

general nonvolatile storage.

➤ Time of day in seconds, minutes,

and hours

➤ Functionally compatible with the

- ^{12- or 24-hour format}

DS1285

- ^{Optional daylight saving}

- ^{Closely matches MC146818A}

adjustment

pin configuration

➤ BCD or binary format for clock

The bq4285 write-protects the clock,

calendar, and storage registers dur-

ing power failure. A backup battery

then maintains data and operates

the clock and calendar.

➤ 114 bytes of general nonvolatile

and calendar data

storage

➤ Programmable square wave out-

➤ Automatic backup and write-

put

protect control to external SRAM

➤ Three individually maskable in-

➤ 160 ns cycle time allows fast bus

The bq4285 is a fully compatible real-

time clock for IBM AT-compatible com-

puters and other applications. The only

external components are a 32.768kHz

crystal and a backup battery.

terrupt event flags:

operation

- ^{Periodic rates from 122}^µ^{s to}

➤ Selectable Intel or Motorola bus

timing (PLCC), Intel bus timing

(DIP and SOIC)

500 ms

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

The bq4285 integrates a battery-

backup controller to make a standard

CMOS SRAM nonvolatile during

power-fail conditions. During power-

fail, the bq4285 automatically write-

protects the external SRAM and pro-

vides a V_CCoutput sourced from the

clock backup battery.

second to once per day

➤ Less than 0.5 µA load under bat-

tery operation

- End-of-clock update cycle

➤ 24-pin plastic DIP or SOIC

➤ 14 bytes for clock/calendar and

control

Pin Connections

Pin Names

AD₀–AD₇

Multiplexed address/data

input/output

MOT

Bus type select input

(PLCC only )

Chip select input

OUT

SQW

R/W

Address strobe input

Data strobe input

Read/write input

OUT

INT

Interrupt request output

Reset input

INT

RST

R/W

INT

RST

SQW

X1–X2

Square wave output

3V backup cell input

Crystal inputs

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

24-Pin DIP or SOIC

PN428501.eps

PN428502.eps

+5V supply

V_SS

Ground

Jan. 1999 D

12 3 4 5 6 7...24

中文翻译

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与BQ4285S-相关器件

型号	品牌	获取价格	描述	数据表
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
BQ4287MT-	TI	获取价格	Real-Time Clock Module With NVRAM Control
BQ4287MT-SB2	TI	获取价格	Real-Time Clock Module With NVRAM Control
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

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