參數(shù)資料
型號(hào)： DS1285
英文描述： Real Time Clock
中文描述： 實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 1/1頁(yè)
文件大小： 21K
代理商： DS1285
DS1285/DS1285Q
Real Time Clock
DS1285/DS1285Q
050898 1/1
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
μ
s 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
DS1285 24–PIN DIP
V
CC
SQW
NC
RCLR
V
BAT
IRQ
RESET
DS
GND
R/W
AS
CS
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
4
3
2
1
RCLR
V
BAT
IRQ
RESET
DS
GND
R/W
28 27 26
25
24
23
22
21
20
19
DS1285Q 28-PIN PLCC
X
M
N
V
S
N
X
A
A
G
C
A
N
12 13 14 15 16 17 18
AD0
AD1
AD2
AD3
AD4
AD5
NC
5
6
7
8
9
10
11
N
PIN DESCRIPTION
AD0-AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
SQW
V
CC
GND
X1,X2
V
BAT
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 drain)
– Square Wave Output
–
+5 Volt Supply
– Ground
– 32.768 KHz Crystal Connections
– +3 Volt Battery Input
– RAM Clear
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1285Q 制造商:Maxim Integrated Products 功能描述:
DS1286 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1286+ 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1286I 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1286I+ 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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