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The DS1645Y-100 is a nonvolatile timekeeping RAM manufactured by DALLAS (now part of Maxim Integrated). Below are its specifications, descriptions, and features:

Specifications:

• Part Number: DS1645Y-100
• Manufacturer: DALLAS (Maxim Integrated)
• Type: Nonvolatile Timekeeping RAM
• Density: 64Kb (8K x 8)
• Access Time: 100ns
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: 0°C to +70°C
• Package: 28-pin DIP (Dual In-line Package)
• Real-Time Clock (RTC): Integrated
• Battery Backup: Built-in lithium energy source
• Data Retention: Minimum 10 years

Descriptions:

The DS1645Y-100 combines a real-time clock (RTC) with a static RAM (SRAM) and a nonvolatile timekeeping function. It maintains time and date information even when power is lost, thanks to its built-in lithium energy source. The device is commonly used in applications requiring timekeeping and data storage, such as embedded systems, industrial controllers, and computing devices.

Features:

• Integrated RTC & SRAM: Combines timekeeping and memory in a single chip.
• Nonvolatile Operation: Maintains data and timekeeping during power loss.
• Automatic Leap Year Compensation: Valid up to the year 2100.
• Battery-Backed SRAM: Ensures data retention without external power.
• Low Power Consumption: Optimized for battery-backed applications.
• Standard JEDEC Pinout: Compatible with industry-standard SRAMs.
• Simple Interface: Directly interfaces with microprocessors.

For detailed technical information, refer to the official datasheet from Maxim Integrated.