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PDF DS1287A Data sheet ( Hoja de datos )
| Número de pieza | DS1287A | |
| Descripción | Real Time Clock | |
| Fabricantes | Dallas Semiconductor | |
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DS1287A
DS1287A
Real Time Clock
www.DataSheet4U.com
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
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 VCC
23 SQW
22 NC
21 RCLR
20 NC
19 IRQ
18 RESET
17 DS
16 NC
15 R/W
14 AS
13 CS
24 PIN ENCAPSULATED PACKAGE
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
VCC
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
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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| PDF Descargar | [ Datasheet DS1287A.PDF ] | |
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