DS1708RESA+T&R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) with Nonvolatile RAM (NVRAM)
• Characteristics:
  • Low-power CMOS technology
  • Battery-backed clock/calendar
  • 64 bytes of nonvolatile RAM
  • I2C serial interface
• Package: SOIC-8
• Essence: Combines a real-time clock and nonvolatile RAM in a single chip
• Packaging/Quantity: Tape and Reel (T&R), 2500 units per reel

Specifications

• Supply Voltage: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Accuracy: ±2 minutes per month at 25°C
• Nonvolatile RAM Retention: 10 years minimum
• I2C Bus Speed: Up to 400kHz

Detailed Pin Configuration

1. VCC - Power supply voltage
2. GND - Ground
3. SDA - Serial data line for I2C communication
4. SCL - Serial clock line for I2C communication
5. WP - Write Protect pin for nonvolatile RAM
6. NC - No connection
7. NC - No connection
8. VBAT - Battery input for backup power

Functional Features

• Real-time clock with calendar functions
• Nonvolatile RAM for data storage
• Battery backup for continuous operation during power loss
• I2C interface for easy integration with microcontrollers
• Write protect feature to prevent accidental data modification

Advantages

• Integration of RTC and NVRAM reduces component count and board space
• Low-power CMOS technology extends battery life
• Wide operating voltage range allows flexibility in power supply selection
• High accuracy clock ensures precise timekeeping
• I2C interface simplifies communication with other devices

Disadvantages

• Limited nonvolatile RAM capacity (64 bytes)
• Clock accuracy may be affected by temperature variations
• Requires an external battery for backup power

Working Principles

The DS1708RESA+T&R combines a real-time clock and nonvolatile RAM in a single chip. The real-time clock keeps track of time and date, while the nonvolatile RAM provides storage for critical data. The chip operates using low-power CMOS technology, ensuring minimal power consumption. In case of a power loss, an external battery powers the chip to maintain accurate timekeeping and preserve data in the nonvolatile RAM.

Detailed Application Field Plans

The DS1708RESA+T&R is widely used in various applications that require accurate timekeeping and data storage. Some potential application fields include:

1. Industrial Automation: Used in programmable logic controllers (PLCs) to timestamp events and store critical data.
2. Medical Devices: Integrated into medical equipment to record patient data and monitor treatment duration.
3. Automotive Systems: Employed in vehicle tracking systems to log trip details and ensure accurate time synchronization.
4. Security Systems: Incorporated into access control systems to maintain accurate event timestamps and store user information.
5. Consumer Electronics: Utilized in digital cameras and audio recorders to timestamp media files and store user settings.

Detailed and Complete Alternative Models

1. DS1307 - Real-Time Clock IC with 56 bytes of nonvolatile RAM
2. DS3231 - Highly accurate RTC with integrated temperature-compensated crystal oscillator
3. PCF8563 - Low-power RTC with alarm and timer functions
4. MCP7940N - I2C RTC with battery switchover and SRAM
5. RV-8803-C7 - Ultra-low power RTC with I2C interface and alarm function

(Note: This list is not exhaustive and there are several other alternative models available in the market.)

Word Count: 477