DS1345YL-100

Product Overview

Category: Integrated Circuits (ICs)

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

Characteristics: - Low-power CMOS technology - 10-year minimum data retention in the absence of power - Automatic power-fail detect and switch circuitry - Battery backup for continuous timekeeping - I²C serial interface - 100-year calendar with leap year compensation - Programmable square wave output - Industrial temperature range (-40°C to +85°C) - Small package size (8-pin SOIC)

Package: 8-pin Small Outline Integrated Circuit (SOIC)

Essence: The DS1345YL-100 is a real-time clock IC that combines a non-volatile RAM with a battery backup, allowing it to keep track of time even when the main power supply is disconnected. It offers various features such as a programmable square wave output and a 100-year calendar with leap year compensation.

Packaging/Quantity: The DS1345YL-100 is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage: 2.7V to 5.5V
• Timekeeping Current: 1.0µA (typical)
• Battery Backup Current: 750nA (typical)
• Memory Size: 4Kb (512 x 8 bits)
• Clock Accuracy: ±2 minutes per month at 25°C
• I²C Bus Frequency: Up to 400kHz

Detailed Pin Configuration

The DS1345YL-100 has eight pins arranged as follows:

____ VCC | | GND SDA | | SQW SCL | | RST VBAT | | NC ----

• VCC: Power supply voltage
• GND: Ground reference
• SDA: Serial Data Line for I²C communication
• SQW: Programmable square wave output
• SCL: Serial Clock Line for I²C communication
• RST: Reset input
• VBAT: Battery backup input
• NC: No connection (unused pin)

Functional Features

1. Real-Time Clock: The DS1345YL-100 accurately keeps track of time, including hours, minutes, seconds, and date information.

2. Non-Volatile RAM: The integrated non-volatile RAM allows data storage even when the power is disconnected.

3. Battery Backup: The IC includes a battery backup circuitry that ensures continuous timekeeping during power outages.

4. I²C Interface: The I²C serial interface enables easy communication with microcontrollers and other devices.

5. Programmable Square Wave Output: The DS1345YL-100 can generate a square wave signal with programmable frequency and duty cycle.

Advantages and Disadvantages

Advantages: - Low-power consumption - Long data retention period - Wide operating temperature range - Small package size - Easy integration with microcontrollers

Disadvantages: - Limited memory capacity (4Kb) - Reliance on an external battery for backup

Working Principles

The DS1345YL-100 utilizes a low-power CMOS technology to operate efficiently while keeping track of time. It uses an internal oscillator and a battery backup circuit to ensure accurate timekeeping even in the absence of power. The I²C interface facilitates communication with external devices, allowing for easy integration into various applications.

Detailed Application Field Plans

The DS1345YL-100 is commonly used in applications where accurate timekeeping is essential, such as:

1. Embedded Systems: The IC is widely used in embedded systems, including industrial automation, smart home devices, and automotive electronics.

2. Data Logging: Its non-volatile RAM capability makes it suitable for data logging applications where persistent storage of time-stamped information is required.

3. Security Systems: The DS1345YL-100 can be utilized in security systems to maintain accurate timestamps for events and alarms.

4. Medical Devices: Medical equipment often requires precise timekeeping for scheduling, monitoring, and synchronization purposes.

Detailed and Complete Alternative Models

1. DS3231: A highly accurate real-time clock module with an integrated temperature-compensated crystal oscillator (TCXO).

2. PCF8563: A low-power real-time clock/calendar IC with a built-in 32.768kHz quartz crystal and I²C interface.

3. MCP7940N: A feature-rich real-time clock/calendar IC with battery backup, SRAM, and various alarm functions.

4. DS1307: An affordable real-time clock module with battery backup and I²C interface.

These alternative models offer similar functionalities to the DS1345YL-