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DS12CR887, DS12R885, DS12R887
RTCs with Constant-Voltage Trickle Charger
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Status
| Part Number |
Status |
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DS12CR887
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Active: In Production. See Ordering Information for details. |
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DS12R885
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Active: In Production. |
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DS12R887
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Active: In Production. |
Description
The DS12R885 is a functional drop-in replacement for the DS12885 real-time clock (RTC). The device provides 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 operates 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. The VBACKUP 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.
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Data Sheet
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This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.
Key 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 Battery-Backed NV 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
- Underwriters Laboratories (UL) Recognized
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Applications/Uses
- Embedded Systems
- Network Hubs, Switches, Routers
- Security Systems
- Utility Meters
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Time Keeping Current
(nA) |
CL
(pF) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Budgetary Price |
| hh = sec/100 |
typ |
See Notes |
| DS12CR887 |
YY-MM-DD/ HH:MM:SS |
Multiplexed |
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- |
- |
NV SRAM |
114 |
1 |
$4.29 @1k |
| DS12R885 |
800 |
12.5 |
$1.61 @1k |
| DS12R887 |
- |
- |
$5.86 @1k |
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See All Timekeeping & Real-Time Clocks (87)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-5217
Rev 6;
2010-05-04
This page last modified: 2010-07-16
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