MAX690TCSA+T

Product Overview

• Category: Integrated Circuits (ICs)
• Use: Real-Time Clock (RTC) with Battery Backup
• Characteristics:
  • Low-power consumption
  • Wide operating voltage range
  • Programmable alarm and timer functions
  • Non-volatile memory for timekeeping
  • Automatic switchover to battery backup
• Package: Surface Mount, 8-SOIC (Small Outline Integrated Circuit)
• Essence: The MAX690TCSA+T is a real-time clock IC that provides accurate timekeeping and alarm functions in various electronic devices.
• Packaging/Quantity: Tape & Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Timekeeping Accuracy: ±2 minutes per month at 25°C
• Alarm Output: Active-high open-drain
• Timer Output: Active-high push-pull
• Battery Backup Voltage Range: 1.2V to 5.5V
• Battery Backup Current: 500nA (typical)

Pin Configuration

The MAX690TCSA+T has an 8-pin SOIC package with the following pin configuration:

┌───┬───┐ │ 1 │ 8 │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 4 │ 5 │ └───┴───┘

Pin Description: 1. VCC: Power supply input 2. GND: Ground reference 3. X1: Crystal oscillator input 4. X2: Crystal oscillator output 5. ALARM: Programmable alarm output 6. TIMER: Programmable timer output 7. VBAT: Battery backup input 8. RST: Reset input

Functional Features

• Accurate Timekeeping: The MAX690TCSA+T utilizes an internal oscillator and a crystal to provide precise timekeeping.
• Programmable Alarm: Users can set the alarm time and configure the alarm output for specific applications.
• Timer Function: The IC includes a programmable timer that can be used for various timing applications.
• Battery Backup: In case of power failure, the MAX690TCSA+T automatically switches to battery backup mode, ensuring uninterrupted timekeeping.
• Non-Volatile Memory: The IC features non-volatile memory to store time and configuration settings even when power is disconnected.

Advantages and Disadvantages

Advantages: - Low-power consumption extends battery life - Wide operating voltage range allows compatibility with different systems - Programmable alarm and timer functions offer flexibility in application design - Automatic switchover to battery backup ensures continuous operation during power outages

Disadvantages: - Timekeeping accuracy may vary with temperature changes - Limited number of programmable alarms and timers - Relatively small package size may require additional space on PCB

Working Principles

The MAX690TCSA+T operates by using an internal oscillator and a crystal to generate clock pulses. These clock pulses are then divided to obtain the desired timekeeping frequency. The IC continuously updates its internal registers with the current time information. The programmable alarm and timer functions allow users to set specific time intervals or alarm times. In case of power loss, the IC switches to battery backup mode, where it draws power from an external battery source to maintain timekeeping functionality.

Detailed Application Field Plans

The MAX690TCSA+T is widely used in various electronic devices that require accurate timekeeping and alarm functions. Some common application fields include:

1. Consumer Electronics: Clock radios, digital watches, and home automation systems.
2. Industrial Automation: Programmable logic controllers (PLCs), data loggers, and timing control systems.
3. Automotive: Car audio systems, dashboard clocks, and vehicle tracking devices.
4. Medical Devices: Patient monitoring systems, infusion pumps, and medical timers.
5. Communication Equipment: Network switches, routers, and telecommunication devices.

Detailed and Complete Alternative Models

• DS1307: Real-Time Clock IC with I2C interface
• PCF8563: Real-Time Clock IC with integrated temperature compensation
• MCP7940N: Real-Time Clock IC with battery switchover and SRAM

These alternative models offer similar functionality to the MAX690TCSA+T and can be considered as replacements based on specific requirements and system compatibility.

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