Professional IC Distribution & Technical Solutions

The DS1287 is a real-time clock (RTC) chip manufactured by Dallas Semiconductor (now part of Maxim Integrated). Below are its key specifications, descriptions, and features:

Specifications:

• Manufacturer: Dallas Semiconductor (DALLAS)
• Type: Real-Time Clock (RTC) with Non-Volatile RAM
• Timekeeping Accuracy: ±1 minute per month at 25°C
• Supply Voltage: 4.5V to 5.5V
• Battery Backup Voltage: 3V (minimum)
• Operating Temperature Range: 0°C to +70°C
• Clock Frequency: 32.768 kHz (crystal-controlled)
• RAM Size: 114 bytes (non-volatile)
• Interface: Parallel (8-bit data bus)
• Package: 24-pin DIP (Dual In-line Package)

Descriptions:

• The DS1287 integrates a real-time clock, calendar, and non-volatile RAM in a single chip.
• It maintains timekeeping functions (seconds, minutes, hours, day, date, month, year) with leap-year compensation.
• Includes a built-in lithium battery and power-fail detection circuitry for continuous operation during power loss.
• Compatible with IBM AT computer systems and other embedded applications requiring timekeeping.

Features:

• Battery-Backed Operation: Maintains time and RAM data during power loss.
• Programmable Alarm: Can generate interrupts at specified times.
• Century Register: Supports year 2000 compliance.
• Power-Fail Detect: Automatically switches to battery backup when main power fails.
• Square Wave Output: Programmable frequency output (from 1Hz to 1MHz).
• Low Power Consumption: Optimized for battery operation.
• Industrial Standard Pinout: Compatible with MC146818 and similar RTCs.

This information is strictly factual and based on the manufacturer's datasheet.