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DS1287A Datasheet

  • DS1287A

  • Real Time Clock

  • 21.61KB

  • 1頁

  • DALLAS   DALLAS

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DS1287A
DS1287A
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
RCLR
NC
IRQ
RESET
DS
NC
R/W
AS
CS
鈥?/div>
Drop-in replacement for IBM AT computer clock/ca-
lendar
鈥?/div>
Pin compatible with the MC146818A
鈥?/div>
Totally nonvolatile with over 10 years of operation in
the absence of power
鈥?/div>
Self-contained
鈥?/div>
Counts
subsystem includes lithium, quartz,
and support circuitry
seconds, minutes, hours, day of the week,
date, month, and year with leap year compensation
alarm
鈥?/div>
Binary or BCD representation of time, calendar, and
鈥?/div>
12- or 24-hour clock with AM and PM in 12-hour mode
鈥?/div>
Daylight Savings Time option
鈥?/div>
Selectable between Motorola and Intel bus timing
鈥?/div>
Multiplex bus for pin efficiency
鈥?/div>
Interfaced with software as 64 RAM locations
鈥?14 bytes of clock and control registers
鈥?50 bytes of general purpose RAM
24 PIN ENCAPSULATED PACKAGE
PIN DESCRIPTION
AD0鈥揂D7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
CC
GND
RCLR
-
-
-
-
-
-
-
-
-
-
-
-
-
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
RAM clear
鈥?/div>
Programmable square wave output signal
鈥?/div>
Bus-compatible interrupt signals (IRQ)
鈥?/div>
Three
interrupts are separately software-maskable
and testable
鈥?Time-of-day alarm once/second to once/day
鈥?Periodic rates from 122
ms
to 500 ms
鈥?End of clock update cycle
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.
022798 1/1

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