Description

The DS1685SN-5+TR is a real-time clock (RTC) designed as a successor to the industry-standard DS1285, DS1385, DS1485, and DS1585 PC RTCs. It provides the industry-standard DS1285 clock function with either +3.0V or +5.0V operation. The DS1685SN-5+TR incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, 242 bytes of user NV SRAM, and 32.768kHz output for sustaining power management activities.

Specifications and features

The DS1685SN-5+TR incorporates the industry-standard DS1287 PC Clock plus enhanced features such as:

• Y2K Compliant
• +3V or +5V Operation
• 64-Bit Silicon Serial Number
• Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
• 32kHz Output for Power Management
• Crystal-Select Bit Allows RTC to Operate with 6pF or 12.5pF Crystal
• SMI Recovery Stack
• 242 Bytes Battery-Backed NV RAM
• Auxiliary Battery Input
• RAM Clear Input
• Century Register
• Date Alarm Register
• Compatible with Existing BIOS for Original DS1287 Functions
• Available as Chip (DS1685) or Stand-Alone Encapsulated DIP (EDIP) with Embedded Battery and Crystal (DS1687)
• Timekeeping Algorithm Includes Leap-Year Compensation Valid Through 2099
• Underwriters Laboratory (UL) Recognized

Application Scenarios

The DS1685SN-5+TR is suitable for various applications, including:

• Embedded Systems
• Utility Meters
• Security Systems
• Network Hubs, Bridges, and Routers

Comparison