DS12887 – Real-Time Clocks

DS12887+ – Real-Time Clock with NVSRAM & Calendar – Analog Devices

The DS12887+ from Analog Devices is an integrated real-time clock (RTC) and calendar module engineered for precise timekeeping in embedded systems. Featuring built-in NVSRAM and parallel interfacing, this through-hole component ensures reliable timestamp accuracy with ultra-low power consumption during battery backup. PCX delivers guaranteed genuine Analog Devices ICs with same-day shipping and dedicated technical support.

Key Features

• Integrated NVSRAM: 114B non-volatile memory retains critical data during power loss
• Precision Timekeeping: HH:MM:SS (12/24 hr) + YY-MM-DD-dd date format with leap year compensation
• Battery Backup Ready: Operates from 2.5V to 4V battery supply (15mA max @ 5V)
• Advanced Functions: Programmable alarms, daylight savings adjustment, square wave output
• Industrial Reliability: 0°C to 70°C operating temperature range

Technical Specifications

Housed in a robust 24-pin DIP module (15.24mm), this RTC utilizes parallel interface communication and operates at 4.5V–5.5V primary voltage. The self-contained oscillator/crystal circuit requires no external components for timekeeping, while the embedded NVSRAM eliminates need for separate memory ICs. Device status is confirmed as Active production.

Common Applications

• Industrial automation controllers and PLC systems
• Medical diagnostic equipment and patient monitors
• Point-of-sale terminals and kiosks
• Building management systems and HVAC controls
• Legacy computing and embedded server platforms

About Analog Devices

Analog Devices (ADI) is a global leader in high-performance semiconductor solutions, renowned for precision analog and mixed-signal ICs. The acquisition of Maxim Integrated further strengthened their portfolio in embedded systems and power management technologies. ADI components are industry benchmarks for reliability, undergoing rigorous military-grade validation protocols.

With over 50 years of innovation, ADI holds 4,000+ patents and supplies critical components to aerospace, healthcare, and industrial sectors. Their commitment to zero-defect manufacturing ensures long-term supply chain stability, making DS12887+ a future-proof solution for mission-critical designs.

About Real-Time Clocks

Real-time clocks (RTCs) are dedicated integrated circuits that track absolute time independently of host processors. Unlike software-based timers, hardware RTCs maintain accuracy during system sleep or power failures using backup batteries. This autonomous operation is essential for timestamping events, scheduling tasks, and maintaining system integrity across reboots.

Advanced RTCs like the DS12887+ integrate supplementary features including non-volatile memory (NVSRAM), alarms, and calendar functions. These eliminate external components while providing critical fail-safe capabilities for industrial equipment, data loggers, and regulatory-compliant medical devices requiring auditable time records.

Packaging Options

Available in protective tube packaging for manual assembly or prototyping. Contact PCX sales for volume-specific reel options.

FAQs

Q: Does the NVSRAM require external batteries for data retention?
A: Yes, connect a 3V lithium cell (or equivalent) to VBAT pin for memory retention during main power loss.

Q: Is this RTC Y2K-compliant?
A: Yes, the date format (YY-MM-DD-dd) includes century-aware leap year calculations up to 2100.

Q: Can I disable daylight savings adjustments?
A: Yes, daylight savings feature is software-programmable via control registers.

Q: What crystal frequency does this module use?
A: Contains an internal 32.768kHz oscillator – no external crystal needed.

Q: How accurate is timekeeping over temperature?
A: Maintains ±2 minutes/month accuracy across 0°C to 70°C range per datasheet.

Q: Can this RTC interface with 3.3V microcontrollers?
A: While VCC requires 4.5V–5.5V, control signals are TTL-compatible. Use level shifters for 3.3V systems.

⚠️ Note: Product images are representational. Refer to datasheet for exact dimensions.
Download Full Datasheet

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