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參數資料
| 型號： | DS12887A |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封裝： | ENCAPSULATED, DIP-24 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 356K |
| 代理商： | DS12887A |
General Description
The DS12885, DS12887, and DS12C887 real-time
clocks (RTCs) are designed to be direct replacements
for the DS1285 and DS1287. The devices provide a
real-time clock/calendar, one time-of-day alarm, three
maskable interrupts with a common interrupt output, a
programmable square wave, and 114 bytes of battery-
backed static RAM (113 bytes in the DS12C887 and
DS12C887A). The DS12887 integrates a quartz crystal
and lithium energy source into a 24-pin encapsulated
DIP package. The DS12C887 adds a century byte at
address 32h. For all devices, the date at the end of the
month is automatically adjusted for months with fewer
than 31 days, including correction for leap years. The
devices
also
operate
in
either
24-hour
or
12-hour format with an AM/PM indicator. A precision
temperature-compensated circuit monitors the status of
VCC. If a primary power failure is detected, the device
automatically switches to a backup supply. A lithium
coin-cell battery can be connected to the VBAT input
pin on the DS12885 to maintain time and date operation
when primary power is absent. The device is accessed
through a multiplexed byte-wide interface, which sup-
ports both Intel and Motorola modes.
Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
Features
Drop-In Replacement for IBM AT Computer
Clock/Calendar
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap Year Compensation
Through 2099
Binary or BCD Time Representation
12-Hour or 24-Hour Clock with AM and PM in
12-Hour Mode
Daylight Saving Time Option
Selectable Intel or Motorola Bus Timing
Interfaced with Software as 128 RAM Locations
14 Bytes of Clock and Control Registers
114 Bytes of General-Purpose, Battery-Backed
RAM (113 Bytes in the DS12C887 and
DS12C887A)
RAM Clear Function (DS12885, DS12887A, and
DS12C887A)
Interrupt Output with Three Independently
Maskable Interrupt Flags
Time-of-Day Alarm Once Per Second to Once
Per Day
Periodic Rates from 122μs to 500ms
End-of-Clock Update Cycle Flag
Programmable Square-Wave Output
Automatic Power-Fail Detect and Switch Circuitry
Optional 28-Pin PLCC Surface Mount Package or
32-Pin TQFP (DS12885)
Optional Encapsulated DIP (EDIP) Package with
Integrated Crystal and Battery (DS12887,
DS12887A, DS12C887, DS12C887A)
Optional Industrial Temperature Range Available
Underwriters Laboratory (UL) Recognized
DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Real-Time Clock
______________________________________________
Maxim Integrated Products
1
DS12885
DS83C520
R/W
AS
GND
X2
X1
VCC
CRYSTAL
DS
VBAT
AD(0–7)
SQW
RESET
IRQ
RCLR
CS
MOT
Typical Operating Circuit
Rev 3; 2/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Pin Configurations and Ordering Information appear at end of data sheet.
相關PDF資料 |
PDF描述 |
|---|---|
| DS12C887A | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS12885S | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS12885QN | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS12C887 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS12887 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS12887A+ | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1290 | 功能描述:計數器移位寄存器 RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| DS12C887 | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12C887+ | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12C887A | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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