Datasheet > BQ4842Y

BQ4842Y

更新时间： 2024-09-14 22:39:39

品牌	Logo	应用领域
德州仪器 - TI		静态存储器
页数	文件大小	规格书
18页	677K
描述
RTC Module With 128Kx8 NVSRAM

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中文翻译

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BQ4842Y 数据手册

bq4842Y

RTC Module With 128Kx8 NVSRAM

Registers for the rea l-time clock,

alarm and other special functions

Features

General Description

➤ I n t e gr a t e d S R AM , r e a l-t im e

clock, CPU supervisor, crysta l,

power-fa il con t r ol cir cu it , a n d

battery

The bq4842Y RTC Module is a non-

volatile 1,048,576-bit SRAM organ-

ized as 131,072 words by 8 bits with

a n in t egr a l a ccessible r ea l-t im e

clock and CPU supervisor. The CPU

supervisor provides a programmable

watchdog timer and a microproces-

sor reset. Other features include

alarm, power-fail, and periodic inter-

rupts, and a battery-low warning.

are located in registers 1FFF0h–

1FFFFh of the memory array.

The clock and alarm registers are

du a l-por t r ea d/wr it e SRAM loca-

tions that are updated once per sec-

ond by a clock control circuit from

the internal clock counters. The

dual-port registers allow clock up-

dates to occur without interrupting

n or m a l a ccess t o t h e r est of t h e

SRAM array.

➤ Rea l-Tim e Clock cou n t s h u n-

dredths of seconds through years

in BCD format

➤ RAM-like clock access

➤ Compatible with industry-

Th e device com bin es a n in t er n a l

lithium battery, quartz crystal, clock

a n d p ower -fa il ch ip, a n d a fu ll

CMOS SRAM in a pla st ic 32-pin

DIP module. The RTC Module di-

rectly replaces industry-standard

SRAMs a n d a lso fit s in t o m a n y

E P R O M a n d E E P R O M s ock e t s

without any requirement for special

write timing or limitations on the

number of write cycles.

standard 128K x 8 SRAMs

The bq4842Y also contains a power-

fail-detect circuit. The circuit dese-

lects the device whenever V_CCfalls

below tolerance, providing a high de-

gree of data security. The battery is

electrically isolated when shipped

from the factory to provide maxi-

mum battery capacity. The battery

remains disconnected until the first

➤ Unlimited write cycles

➤ 10-year minimum data retention

and clock operation in the ab-

sence of power

➤ Automatic power-fail chip dese-

lect and write-protection

➤ Watchdog timer, power-on reset,

alarm/periodic interrupt, power-

fail and battery-low warning

application of V_CC

➤ Soft wa r e clock ca libr a t ion for

gr e a t e r t h a n ±1 m in u t e p e r

month accuracy

Pin Connections

Pin Names

A₀–A₁₆

Address input

Chip enable

RST

INT

RST

Microprocessor reset

Write enable

Output enable

DQ₀–DQ₇Data in/data out

INT

V_CC

V_SS

Programmable interrupt

+5 volts

Ground

32-Pin DIP Module

PN484201.eps

Sept. 1996 C

12 3 4 5 6 7...18

中文翻译

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与BQ4842Y相关器件

型号	品牌	获取价格	描述	数据表
BQ4842YMA-85	TI	获取价格	RTC Module With 128Kx8 NVSRAM
BQ4845	TI	获取价格	Parallel RTC With CPU Supervisor
BQ4845P	TI	获取价格	0 TIMER(S), REAL TIME CLOCK, PDIP28, 0.600 INCH, PLASTIC, DIP-28
BQ4845P-	TI	获取价格	Parallel RTC With CPU Supervisor
BQ4845P-A4	TI	获取价格	Parallel RTC With CPU Supervisor
BQ4845PN	TI	获取价格	0 TIMER(S), REAL TIME CLOCK, PDIP28, 0.600 INCH, PLASTIC, DIP-28
BQ4845P-N	TI	获取价格	Parallel RTC With CPU Supervisor
BQ4845S	TI	获取价格	0 TIMER(S), REAL TIME CLOCK, PDSO28, 0.300 INCH, PLASTIC, SOIC-28
BQ4845S-	TI	获取价格	Parallel RTC With CPU Supervisor
BQ4845S-A4	TI	获取价格	Parallel RTC With CPU Supervisor

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