DS1687-5+

The DS1687-5+ is a real-time clock (RTC) with an integrated non-volatile RAM (NV RAM) and a built-in quartz crystal, designed by Maxim Integrated (now part of Analog Devices).
### Key Features:
- Real-Time Clock (RTC): Tracks time (seconds, minutes, hours, date, month, year) with leap-year compensation.
- NV RAM: 114 bytes of battery-backed RAM for data retention.
- Battery Backup: Operates in low-power mode when external power fails.
- Integrated Crystal: Eliminates the need for an external oscillator.
- Wide Voltage Range: Operates from 4.5V to 5.5V.
- Industrial Temperature Range: -40°C to +85°C.
### Applications:
- Embedded systems
- Industrial controllers
- Data loggers
- POS terminals
The DS1687-5+ is a drop-in replacement for the DS1287 and DS12887, offering reliable timekeeping and data storage in a single IC.

Equivalent products to the DS1687-5+ (a real-time clock/NVRAM chip) include:
- DS12887+ (similar RTC/NVRAM, pin-compatible)
- DS12C887+ (higher temp range variant)
- DS1687 (same family, no suffix differences)
- M48T58 (from STMicroelectronics)
- MK48T08 (from STMicroelectronics)
These offer comparable RTC and NVRAM functionality. Verify pinouts and specs for exact compatibility.

The DS1687-5+ is a real-time clock (RTC) with integrated NV SRAM and a microprocessor supervisor. Key features:
- Real-Time Clock: Tracks time (seconds to years) with leap-year compensation.
- Nonvolatile SRAM: 114 bytes of battery-backed RAM for data retention.
- Microprocessor Supervisor: Monitors VCC for power failures, resets the CPU if needed.
- Battery Backup: Operates from an external battery (3V lithium) during power loss.
- Low Power: Consumes minimal current in battery mode (~1µA typical).
- Industrial Temp Range: Operates from -40°C to +85°C.
- 5V Operation: Compatible with 5V systems.
- DIP Package: 24-pin dual in-line package for easy integration.
Ideal for embedded systems requiring timekeeping, data logging, or power-fail recovery.

The DS1687-5+ is a 24-pin real-time clock (RTC) with integrated NV SRAM, a battery-backed power-fail circuit, and a watchdog timer.
### Key Functions:
- Real-Time Clock (RTC): Tracks time (seconds, minutes, hours, etc.) with leap-year compensation.
- Nonvolatile (NV) SRAM: 114 bytes of battery-backed RAM for data retention.
- Power-Fail Protection: Automatically switches to battery backup on power loss.
- Watchdog Timer: Monitors system activity; resets the system if needed.
- Interrupt Output: Alerts the system for time-based or watchdog events.
### Pin Count:
- 24-pin (DIP/SOIC package).
This IC is commonly used in embedded systems requiring reliable timekeeping and data retention.

The DS1687-5+ is manufactured by Maxim Integrated, now part of Analog Devices following a 2021 acquisition.
Maxim Integrated was a leading semiconductor company specializing in analog and mixed-signal ICs, including real-time clocks (RTCs), data converters, and power management solutions. The DS1687-5+ is a real-time clock (RTC) with integrated NV SRAM, commonly used in embedded systems.
Analog Devices (ADI) is a global semiconductor firm known for high-performance analog, mixed-signal, and digital signal processing technologies. The merger strengthened ADI’s portfolio in industrial, automotive, and communications markets.
Both companies are recognized for innovation in precision electronics.

The DS1687-5+ is a real-time clock (RTC) with integrated NV SRAM and a microprocessor supervisor. Its key application areas include:
- Embedded Systems: Timekeeping and data logging.
- Industrial Automation: Process timing and event recording.
- Medical Devices: Timestamping critical operations.
- Telecom Equipment: Network synchronization and backup power management.
- Point-of-Sale (POS) Systems: Transaction time tracking and memory backup.
- Automotive Electronics: Event logging and power-fail recovery.
Its integrated battery backup ensures continuous operation during power loss, making it ideal for systems requiring reliable timekeeping and non-volatile memory.

The DS1687-5+ is a real-time clock (RTC) module with NV SRAM, packaged in a 24-pin DIP (Dual In-line Package). It integrates a clock/calendar, battery, and non-volatile memory, commonly used in embedded systems for timekeeping and data retention. The DIP package is through-hole mountable, suitable for prototyping or applications requiring easy manual assembly.