The Maxim Integrated DS1397 is a versatile, low-voltage serial timekeeping IC designed for a wide range of applications requiring accurate timekeeping and data storage. This compact device integrates a real-time clock/calendar and 31 bytes of static RAM, providing a full binary-coded decimal (BCD) clock calendar that is accessible through an SPI interface.

Key Features

• Real-Time Clock/Calendar: Tracks time in hours, minutes, and seconds, and the date in terms of day, month, and year.
• Serial Peripheral Interface (SPI): Allows for simple communication with microcontrollers and other digital systems.
• Low Voltage Operation: Operates at 2.0V to 5.5V, making it ideal for battery-powered applications.
• Battery Backup Input: Preserves timekeeping and RAM data with an external battery during main power loss.
• 31 Bytes of NV SRAM: Nonvolatile static RAM for storage of critical data that must be preserved during power loss.
• Automatic Power-Fail Detect: Switches to battery backup when main power falls below a preset threshold.
• Trickle-Charge Capability: Maintains battery charge when main power is present, ensuring long-term reliability.

Applications

The DS1397 is suitable for a variety of applications, including:

• Handheld devices
• Embedded systems
• Utility meters
• Point-of-sale equipment
• Medical devices
• Industrial control systems

Product Specifications

Overall, the Maxim Integrated DS1397 is a reliable and efficient solution for electronic systems that require accurate timekeeping and data retention without the need for external components, making it a go-to choice for designers and engineers.