參數(shù)資料
型號(hào)： DS1287
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?。?/td> 19K
代理商： DS1287
DS1287
Real Time Clock
DS1287
050898 1/1
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
μ
s to 500 ms
– End of clock update cycle
PIN ASSIGNMENT
24 PIN ENCAPSULATED PACKAGE
V
CC
SQW
NC
NC
NC
IRQ
RESET
DS
NC
R/W
AS
CS
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
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
CC
GND
-
-
-
-
-
-
-
-
-
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
DESCRIPTION
The DS1287 Real Time Clock is designed to be a direct
replacement for the MC146818A. For a complete
description of operating conditions, electrical and
mechanical characteristics, bus timing, and pin descrip-
tions see the DS12887 data sheet.
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DS12885+ 功能描述:實(shí)時(shí)時(shí)鐘 RTC 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
DS12885N 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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