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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 |
Integrated XTAL |
Budgetary Price |
| hh = sec/100 |
typ |
See Notes |
| DS12CR887 |
YY-MM-DD/ HH:MM:SS |
Multiplexed |
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- |
- |
NV SRAM |
114 |
1 |
No |
$4.29 @1k |
| DS12R885 |
800 |
12.5 |
$1.61 @1k |
| DS12R887 |
- |
- |
$5.86 @1k |
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See All Timekeeping & Real-Time Clocks (86)
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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
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS12CR887-33
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N/A |
No Longer Available |
DS12CR887-33+
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EDIP;24 pin;544.6 mm²
Outline Drawing:21-0241 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDP24-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS12CR887-33+
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Active |
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EDIP;24 pin;544.6 mm²
Outline Drawing:21-0241 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDP24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12CR887-5
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N/A |
No Longer Available |
DS12CR887-5+
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EDIP;24 pin;544.6 mm²
Outline Drawing:21-0241 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDP24-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS12CR887-5+
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Active |
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EDIP;24 pin;544.6 mm²
Outline Drawing:21-0241 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDP24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12R885S-33+
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Active |
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SOIC(W);24 pin;166.1 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12R885S-33+T&R
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Active |
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SOIC(W);24 pin;166.1 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12R885S-5+
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Active |
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SOIC(W);24 pin;166.1 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12R885S-5+T&R
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Active |
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SOIC(W);24 pin;166.1 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS12R887-33
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Active |
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BGA;48 pin;180.5 mm²
Outline Drawing:21-0364 (PDF)
Land Pattern: 90-0309 (PDF)
Use pkgcode/variation: V48-H1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS12R887-5
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Active |
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BGA;48 pin;180.5 mm²
Outline Drawing:21-0364 (PDF)
Land Pattern: 90-0309 (PDF)
Use pkgcode/variation: V48-H1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
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Information Index
Document Ref.: 19-5217
Rev 6;
2010-05-04
This page last modified: 2010-07-16
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