EEWORLDEEWORLDEEWORLD

Part Number

Search

DS1287

Description
Real Time Clock
CategoryThe embedded processor and controller    Microcontrollers and processors   
File Size18KB,1 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
Download Datasheet Parametric View All

DS1287 Overview

Real Time Clock

DS1287 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerDALLAS
Reach Compliance Codeunknow
Other featuresDAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING; 10 YEARS DATA RETENTION
External data bus width8
Information access methodsPARALLEL, MUXED BUS
interrupt capabilityY
JESD-30 codeR-PDIP-T18
JESD-609 codee0
Number of terminals18
Number of timers1
On-chip data RAM width8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output clock frequency0.008192 MHz
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP24,.6
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Certification statusNot Qualified
RAM (number of words)50
Maximum slew rate15 mA
Maximum supply voltage5.5 V
Minimum supply voltage4.5 V
Nominal supply voltage5 V
surface mountNO
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
shortest timeSECONDS
Maximum time at peak reflow temperatureNOT SPECIFIED
VolatileNO
uPs/uCs/peripheral integrated circuit typeTIMER, REAL TIME CLOCK
DS1287
DS1287
Real Time Clock
FEATURES
PIN ASSIGNMENT
MOT
NC
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
SQW
NC
NC
NC
IRQ
RESET
DS
NC
R/W
AS
CS
Drop-in replacement for IBM AT computer clock/ca-
lendar
Pin compatible with the MC146818A
Totally nonvolatile with over 10 years of operation in
the absence of power
Self-contained
Counts
subsystem includes lithium, quartz,
and support circuitry
seconds, minutes, hours, day of the week,
date, month, and year with leap year compensation
alarm
Binary or BCD representation of time, calendar, and
12- or 24-hour clock with AM and PM in 12-hour mode
Daylight Savings Time option
Selectable between Motorola and Intel bus timing
Multiplex bus for pin efficiency
Interfaced with software as 64 RAM locations
– 14 bytes of clock and control registers
– 50 bytes of general purpose RAM
24 PIN ENCAPSULATED PACKAGE
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
CC
GND
-
-
-
-
-
-
-
-
-
-
-
-
Multiplexed address/data bus
No connection
Bus type selection
Chip select
Address strobe
Read/write input
Data strobe
Reset input
Interrupt request output (open
Square wave output
+5 volt supply
Ground
Programmable square wave output signal
Bus-compatible interrupt signals (IRQ)
Three
interrupts are separately software-maskable
and testable
– Time-of-day alarm once/second to once/day
– Periodic rates from 122
µs
to 500 ms
– End of clock update cycle
DESCRIPTION
The DS1287 Real Time Clock is designed to be a direct
replacement for the MC146818A. For a complete
description of operating conditions, electrical and
mechanical characteristics, bus timing, and pin descrip-
tions see the DS12887 data sheet.
050898 1/1

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 2688  224  2161  900  597  55  5  44  19  13 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号