Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

DS1287A Datasheet(PDF) 1 Page - Dallas Semiconductor

Part No. DS1287A
Description  Real Time Clock
Download  1 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  DALLAS [Dallas Semiconductor]
Homepage  http://www.dalsemi.com
Logo 

DS1287A Datasheet(HTML) 1 Page - Dallas Semiconductor

   
Zoom Inzoom in Zoom Outzoom out
 1 / 1 page
background image
DS1287A
Real Time Clock
DS1287A
022798 1/1
FEATURES
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 subsystem includes lithium, quartz,
and support circuitry
Counts seconds, minutes, hours, day of the week,
date, month, and year with leap year compensation
Binary or BCD representation of time, calendar, and
alarm
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
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
ms to 500 ms
– End of clock update cycle
PIN ASSIGNMENT
24 PIN ENCAPSULATED PACKAGE
VCC
SQW
NC
RCLR
NC
IRQ
RESET
DS
NC
R/W
AS
CS
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
PIN DESCRIPTION
AD0–AD7
-
Multiplexed address/data bus
NC
-
No connection
MOT
-
Bus type selection
CS
-
Chip select
AS
-
Address strobe
R/W
-
Read/write input
DS
-
Data strobe
RESET
-
Reset input
IRQ
-
Interrupt
request
output
(open
drain)
SQW
-
Square wave output
VCC
-
+5 volt supply
GND
-
Ground
RCLR
-
RAM clear
DESCRIPTION
The DS1287A is identical to the DS1287 with the addi-
tion of the RAM clear pin. For a complete description of
operating conditions, electrical and mechanical charac-
teristics, bus timing, and pin descriptions see the
DS12887A data sheet.


Html Pages

1 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
DP8573AReal Time Clock RTC 1 2 3 4 5 MoreNational Semiconductor (TI)
M48T865V PC REAL TIME CLOCK 1 2 3 4 5 MoreSTMicroelectronics
DS1495RAMified Real Time Clock 1 2 3 4 5 MoreDallas Semiconductor
RTC-72421Real time clock module 4-bit REAL TIME CLOCK MODULE 1 2 List of Unclassifed Manufacturers
X1243Real Time Clock/Calendar/Alarm with EEPROM 1 2 3 4 5 MoreIntersil Corporation
RTC-65271Real time clock 1 2 Epson ToYoCom
DS16292-Wire Digital Thermometer and Real Time Clock 1 2 3 4 5 MoreDallas Semiconductor
DS14285Real Time Clock with NV RAM Control 1 2 3 4 5 MoreDallas Semiconductor
X1240Real Time Clock/Calendar with EEPROM 1 2 3 4 5 MoreXicor Inc.
MSM58321REAL TIME CLOCK/CALENDAR 1 2 3 4 5 MoreOKI electronic componets

Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn