DS12887 Datasheet

IC型号：
DS12887
PDF描述：
Real Time Clock
文件大小：
584.91KB
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DS12887

Real Time Clock

www.dalsemi.com

FEATURES

搂

Drop鈥搃n replacement for IBM AT computer

clock/calendar

Pin-compatible with the MC146818B and

DS1287

Totally nonvolatile with over 10 years of

operation in the absence of power

Self鈥揷ontained subsystem includes lithium,

quartz, and support circuitry

Counts seconds, minutes, hours, days, day of

the week, date, month, and year with leap

year compensation valid up to 2100

Binary or BCD representation of time,

calendar, and alarm

12鈥?or 24鈥揾our clock with AM and PM in

12鈥揾our mode

Daylight Savings Time option

Selectable between Motorola and Intel bus

timing

Multiplex bus for pin efficiency

Interfaced with software as 128 RAM

locations

鈥?14 bytes of clock and control registers

鈥?114 bytes of general purpose RAM

Programmable square wave output signal

Bus鈥揷ompatible interrupt signals (

IRQ

)

Three interrupts are separately software鈥?/div>

maskable and testable

鈥?Time鈥搊f鈥揹ay alarm once/second to

once/day

鈥?Periodic rates from 122 ms to 500 ms

鈥?End of clock update cycle

PIN ASSIGNMENT

PIN DESCRIPTION

AD0鈥揂D7

MOT

搂

RESET

IRQ

SQW

GND

鈥?Multiplexed Address/Data Bus

鈥?No Connection

鈥?Bus Type Selection

鈥?Chip Select

鈥?Address Strobe

鈥?Read/Write Input

鈥?Data Strobe

鈥?Reset Input

鈥?Interrupt Request Output

鈥?Square Wave Output

鈥?+5 Volt Supply

鈥?Ground

DESCRIPTION

The DS12887 Real Time Clock plus RAM is designed to be a direct replacement for the DS1287. The

DS12887 is identical in form, fit, and function to the DS1287, and has an additional 64 bytes of general

purpose RAM. Access to this additional RAM space is determined by the logic level presented on AD6

during the address portion of an access cycle. A lithium energy source, quartz crystal, and write鈥?/div>

protection circuitry are contained within a 24鈥損in dual in-line package. As such, the DS12887 is a

complete subsystem replacing 16 components in a typical application. The functions include a nonvolatile

time鈥搊f鈥揹ay clock, an alarm, a one-hundred鈥搚ear calendar, programmable interrupt, square wave

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DS12887 PDF文件相关型号

DS12887

DS12887 产品属性

标准包装
14
类别
集成电路 (IC)
家庭
时钟/计时 - 实时时钟
系列
-
类型
时钟/日历
特点
警报器，夏令时，闰年，NVSRAM，方波输出
存储容量
114B
时间格式
HH:MM:SS（12/24 小时）
数据格式
YY-MM-DD-dd
接口
并联
电源电压
4.5 V ~ 5.5 V
电压 - 电源，电池
2.5 V ~ 4 V
工作温度
0°C ~ 70°C
安装类型
通孔
封装/外壳
24-DIP 模块（0.600"，15.24mm）
供应商设备封装
24-EDIP
包装
管件

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