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PDF DS1285 Data sheet ( Hoja de datos )
| Número de pieza | DS1285 | |
| Descripción | Real Time Clock | |
| Fabricantes | Dallas Semiconductor | |
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DS1285/DS1285Q
DS1285/DS1285Q
Real Time Clock
www.DataSheet4U.com
FEATURES
• Drop-in replacement for IBM AT computer clock/ca-
lendar
• Pin configuration closely matches MC146818A
• 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 µs to 500 ms
– End of clock update cycle
• Optional 28-pin PLCC surface mount package
DESCRIPTION
The DS1285 Real Time Chip is a direct replacement for
the MC146818A in IBM AT computer clock/calendar
and other applications. For a complete description of
operating conditions, electrical and mechanical charac-
teristics, bus timing, and pin descriptions see the
DS12885 data sheet.
PIN ASSIGNMENT
MOT
X1
X2
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
DS1285 24–PIN DIP
VCC
SQW
NC
RCLR
VBAT
IRQ
RESET
DS
GND
R/W
AS
CS
AD0
AD1
AD2
AD3
AD4
AD5
NC
4 3 2 1 28 27 26
5 25
6 24
7 23
8 22
9 21
10 20
11 19
12 13 14 15 16 17 18
RCLR
VBAT
IRQ
RESET
DS
GND
R/W
DS1285Q 28-PIN PLCC
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
GND
– +5 Volt Supply
– Ground
X1,X2
– 32.768 KHz Crystal Connections
VBAT
RCLR
– +3 Volt Battery Input
– RAM Clear
050898 1/1
1 page | ||
| Páginas | Total 1 Páginas | |
| PDF Descargar | [ Datasheet DS1285.PDF ] | |
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