DS12CR887, DS12R885, DS12R887 RTC with Constant-Voltage Trickle Charger

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Description

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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 V_CC. If a primary power failure is detected, the device automatically switches to a backup 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.

Key Features

Applications/Uses

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

	Embedded Systems
	Network Hubs, Switches, Routers
	Security Systems
	Utility Meters

Key Specifications: Timekeeping & Real-Time Clocks

Part Number

Time Format (hh = sec/100)

Date Format

Interface

Supply Voltage (V)

Time- keeping Current (typ) (nA)

C_L, Load Capacitance (pF)

Memory Type

Memory Size (Bytes)

Number of Time of Day Alarms

Features

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

DS12CR887

HH:MM:SS

YY-MM-DD

Multiplexed

3.3
5

NV SRAM

114

•	Battery + Crystal

•	Periodic Interrupt

•	Square-Wave Output

Yes

MOD/24

-40 to +85

$3.08 @ 1k

DS12R885

800

12.5

•	Periodic Interrupt

•	Square-Wave Output

Yes

SOIC/24

$1.53 @ 1k

DS12R887

•	Battery + Crystal

•	Periodic Interrupt

•	Square-Wave Output

See Data Sheet

BGA/48

$4.33 @ 1k

See All Timekeeping & Real-Time Clocks (86)

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.