DS1708ESA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) with Nonvolatile Memory
• Characteristics: Low-power, Small form factor, High accuracy
• Package: SOIC-8 (Small Outline Integrated Circuit), Surface Mount
• Essence: Combines a real-time clock and nonvolatile memory in a single chip
• Packaging/Quantity: Available in tape and reel packaging, 2500 units per reel

Specifications

• Supply Voltage: 2.7V to 5.5V
• Clock Accuracy: ±2 minutes per month at 25°C
• Memory Capacity: 4Kbits (512 x 8-bit)
• Operating Temperature Range: -40°C to +85°C
• I/O Compatibility: 3.3V or 5V logic levels
• Battery Backup: Integrated lithium energy source for backup power

Detailed Pin Configuration

The DS1708ESA has the following pin configuration:

1. VCC - Power supply input
2. GND - Ground connection
3. SDA - Serial Data I/O
4. SCL - Serial Clock Input
5. RST - Reset Input
6. NC - No Connection
7. WP - Write Protect Input
8. VBAT - Battery Backup Input

Functional Features

• Real-time clock with calendar functionality
• Nonvolatile memory for data storage
• Automatic switchover to battery backup during power loss
• Programmable alarm and interrupt functions
• I2C interface for communication with microcontrollers
• Low-power consumption for extended battery life

Advantages and Disadvantages

Advantages: - Integration of RTC and nonvolatile memory saves board space - High accuracy ensures precise timekeeping - Battery backup provides data retention during power outages - Programmable features offer flexibility for various applications

Disadvantages: - Limited memory capacity compared to other RTCs - Requires an external battery for backup power

Working Principles

The DS1708ESA combines a real-time clock and nonvolatile memory to provide accurate timekeeping and data storage capabilities. It operates by using an internal oscillator to keep track of time, which can be accessed and controlled through the I2C interface. The nonvolatile memory allows users to store important data that remains intact even when power is lost. During normal operation, the device is powered by the main supply voltage, but it automatically switches to the integrated lithium battery backup in case of power failure.

Detailed Application Field Plans

The DS1708ESA is commonly used in various applications, including:

1. Embedded Systems: Provides real-time clock functionality for time-sensitive operations in microcontroller-based systems.
2. Data Logging: Stores critical data such as temperature, humidity, or event timestamps in nonvolatile memory for later retrieval.
3. Security Systems: Enables accurate time synchronization for access control systems, alarm panels, and surveillance devices.
4. Industrial Automation: Facilitates precise scheduling and timing in industrial processes, ensuring efficient operation.
5. Medical Devices: Supports time-stamping of medical events and data logging in healthcare equipment.

Alternative Models

1. DS1307 - Similar real-time clock with 56 bytes of nonvolatile RAM
2. DS3231 - Enhanced version with higher accuracy and additional alarms
3. PCF8563 - Low-power RTC with integrated temperature compensation

These alternative models offer similar functionalities and can be considered based on specific requirements and preferences.

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