DS17285S-3

实时时钟 Real-Time Clocks

General Description

The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks RTCs are designed to be

successors to the industry-standard DS12885 and DS12887. The DS17285, DS17485, and DS17885 here after referred to as the DS17x85 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 NV SRAM.

Features

♦Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions

♦RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099

♦Optional +3.0V or +5.0V Operation

♦SMI Recovery Stack

♦64-Bit Silicon Serial Number

♦Power-Control Circuitry Supports System Power On from Date/Time Alarm or Key Closure

♦Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal

♦12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode

♦114 Bytes of General-Purpose, Battery-Backed NVSRAM

♦Extended Battery-Backed NV SRAM

  2048 Bytes DS17285/DS17287

  4096 Bytes DS17485/DS17487

  8192 Bytes DS17885/DS17887

♦RAM Clear Function

♦Interrupt Output with Six Independently Maskable Interrupt Flags

♦Time-of-Day Alarm Once per Second to Once per Day

♦End of Clock Update Cycle Flag

♦Programmable Square-Wave Output

♦Automatic Power-Fail Detect and Switch Circuitry

♦Available in PDIP, SO, or TSOP Package

  DS17285, DS17485, DS17885

♦Optional Encapsulated DIP EDIP Package with

 Integrated Crystal and Battery DS17287, DS17487, DS17887

♦Optional Industrial Temperature Range Available

♦Underwriters Laboratory UL Recognized

Applications

Embedded Systems

Utility Meters

Security Systems

Network Hubs, Bridges, and Routers