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參數(shù)資料
| 型號(hào)： | DS12R887-5 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | XO, clock |
| 英文描述： | RTC with Constant-Voltage Trickle Charger |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封裝： | 0.700 INCH, ENCAPSULATED, DIP-24 |
| 文件頁數(shù)： | 1/22頁 |
| 文件大?。?/td> | 1093K |
| 代理商： | DS12R887-5 |
General Description
The DS12R885 is a functional drop-in replacement for
the DS12885 real-time clock (RTC). The device pro-
vides an RTC/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. The date at the end of the month is
automatically adjusted for months with fewer than 31
days, including correction for leap years. It also oper-
ates in either 24-hour or 12-hour format with an AM/PM
indicator. A precision temperature-compensated circuit
monitors the status of V
CC
. If a primary power failure is
detected, the device automatically switches to a back-
up supply. The V
BACKUP
pin supports a rechargeable
battery or a super cap and includes an integrated,
always enabled trickle charger. The DS12R885 is
accessed through a multiplexed byte-wide interface,
which supports both Intel and Motorola modes. The
DS12CR887 and DS12R887 integrate the DS12R885
die with a crystal and battery.
Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
Features
Trickle-Charge Capability for a Rechargeable
Battery or Super Cap
Selectable Intel or Motorola Bus Timing
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation to
2100
Interrupt Output with Three Independently
Maskable Interrupt Flags
Time-of-Day Alarm is Once-per-Second to Once-
per-Day
Periodic Rates from 122μs to 500ms
End-of-Clock Update Cycle Flag
14 Bytes of Clock and Control Registers
114 Bytes of General-Purpose RAM with Clear Input
Programmable Square-Wave Output
Automatic Power-Fail Detect and Switch Circuitry
+5.0V or +3.3V Operation
Industrial Temperature Range
DS12CR887 Encapsulated DIP (EDIP) Module with
Integrated Battery and Crystal
DS12R887 BGA Module Surface-Mountable
Package with Integrated Crystal and Rechargeable
Battery
D
RTC with Constant-Voltage Trickle Charger
______________________________________________
Maxim Integrated Products
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.
1
Ordering Information
DS12R885
DS83C520
±
R/W
AS
GND
X2
X1
V
CC
V
CC
RESET
CRYSTAL
DS
V
BACKUP
SUPER
CAP
AD(0–7)
SQW
IRQ
RCLR
CS
MOT
Typical Operating Circuit
Rev 1; 4/04
PART
TEMP RANGE
PIN-
PA CKA GE
TOP MARK
DS12R885-5
-40°C to +85°C
24 SO
(300 mils)
DS12R885-5
DS12R885-33
-40°C to +85°C
24 SO
(300 mils)
DS12R885-33
DS12CR887-5
-40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-5
D S 12C R887- 33
-40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-33
DS12R887-5*
DS12R887-33*
-40°C to +85°C 48 BGA
-40°C to +85°C 48 BGA
DS12R887-5
DS12R887-33
Pin Configurations appear at end of data sheet.
*
Future product—contact factory for availability.
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