DS1687-3IND

Product Overview

Category: Integrated Circuit (IC)

Use: Real-Time Clock (RTC) with Non-Volatile RAM (NVRAM)

Characteristics: - Combines a real-time clock and non-volatile RAM in a single package - Provides accurate timekeeping and data storage capabilities - Suitable for applications requiring time and date information, such as embedded systems, industrial automation, and consumer electronics

Package: DIP (Dual In-line Package)

Essence: The DS1687-3IND is a versatile IC that integrates a real-time clock and non-volatile RAM, offering reliable timekeeping and data storage functionalities.

Packaging/Quantity: The DS1687-3IND is typically packaged in a DIP format and is available in various quantities depending on the supplier.

Specifications

The DS1687-3IND features the following specifications:

• Real-Time Clock:

  • Accuracy: ±2 minutes per month at 25°C
  • Time Format: 24-hour or 12-hour with AM/PM indicator
  • Calendar: Day, month, year, and leap year compensation
  • Alarm: Programmable alarm with interrupt capability

• Non-Volatile RAM:

  • Capacity: 128 bytes
  • Data Retention: Over 10 years
  • Endurance: 1 million write cycles

Detailed Pin Configuration

The DS1687-3IND has the following pin configuration:

1. VCC: Power supply voltage
2. GND: Ground reference
3. X1: Crystal oscillator input
4. X2: Crystal oscillator output
5. RST: Reset input
6. A0-A6: Address inputs for NVRAM access
7. CE: Chip enable input
8. I/O: Bidirectional data input/output
9. SCLK: Serial clock input
10. SDA: Serial data input/output

Functional Features

The DS1687-3IND offers the following functional features:

1. Real-Time Clock:

   • Accurate timekeeping with low power consumption
   • Automatic leap year compensation
   • Programmable alarm for time-based events
   • Battery backup for continuous operation during power loss

2. Non-Volatile RAM:

   • Data storage without requiring external power
   • High endurance and long data retention period
   • Easy read/write access through serial interface

Advantages and Disadvantages

Advantages: - Integration of real-time clock and non-volatile RAM in a single package saves board space - Accurate timekeeping and reliable data storage capabilities - Low power consumption for extended battery life - Easy integration into various applications due to standard DIP package

Disadvantages: - Limited NVRAM capacity (128 bytes) - Relatively higher cost compared to separate RTC and NVRAM components

Working Principles

The DS1687-3IND utilizes an internal crystal oscillator to generate accurate timekeeping signals. It combines this functionality with non-volatile RAM to provide data storage capabilities. The IC is powered by an external power supply and also includes a backup battery to ensure uninterrupted operation during power outages.

The real-time clock keeps track of time, compensates for leap years, and triggers alarms based on user-defined settings. The non-volatile RAM allows data to be stored even when power is disconnected, ensuring data integrity and persistence.

Detailed Application Field Plans

The DS1687-3IND can be applied in various fields, including:

1. Embedded Systems:

   • Time-stamping of events and data logging
   • Synchronization of multiple devices
   • System wake-up and power management

2. Industrial Automation:

   • Time-sensitive process control and scheduling
   • Data logging for quality control and traceability
   • Time synchronization in distributed systems

3. Consumer Electronics:

   • Digital watches and clocks
   • Set-top boxes and digital recorders
   • Home automation systems

Detailed and Complete Alternative Models

Some alternative models to the DS1687-3IND include:

1. DS1307: Real-Time Clock IC with I2C interface
2. DS3231: Highly accurate RTC with temperature compensation
3. MCP7940N: Real-Time Clock with battery-backed SRAM
4. PCF8563: Low-power RTC with alarm and timer functions

These alternative models offer similar functionalities but may have different specifications, package types, or additional features depending on the specific requirements of the application.

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