DS1287 Dallas Semiconductor, DS1287 Datasheet
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DS1287
Manufacturer Part Number
DS1287
Description
Real Time Clock
Manufacturer
Dallas Semiconductor
Datasheet
1.DS1287.pdf
(1 pages)
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FEATURES
DESCRIPTION
The DS1287 Real Time Clock is designed to be a direct
replacement for the MC146818A.
description of operating conditions, electrical and
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
Programmable square wave output signal
Bus-compatible interrupt signals (IRQ)
Three interrupts are separately software-maskable
and testable
– 14 bytes of clock and control registers
– 50 bytes of general purpose RAM
– Time-of-day alarm once/second to once/day
– Periodic rates from 122 s to 500 ms
– End of clock update cycle
For a complete
PIN ASSIGNMENT
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
GND
mechanical characteristics, bus timing, and pin descrip-
tions see the DS12887 data sheet.
CC
MOT
GND
24 PIN ENCAPSULATED PACKAGE
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
NC
NC
- 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
1
2
3
4
5
6
7
8
9
10
11
12
Real Time Clock
24
23
22
21
20
19
18
17
16
15
14
13
V
SQW
NC
NC
NC
IRQ
RESET
DS
NC
R/W
AS
CS
CC
DS1287
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DS1287