DS1742W-120+

Real Time Clock Memory DS1742W-120+
7,071 Effective Inventory

DS1742W-120+

Effective Inventory7,071

Real Time Clock Memory DS1742W-120+

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DS1742W-120+ DataSheet
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DS1742W-120+ Details

The DS1742W-120+ is a high-reliability, non-volatile real-time clock (RTC) from Analog Devices Inc./Maxim Integrated, designed for industrial applications. This device provides accurate timekeeping and data storage in the absence of power, making it suitable for industrial control systems, automation equipment, and other embedded systems.

Pinout

  • VCC (1): Positive Power Supply
  • GND (2): Ground
  • SCL (3): Serial Clock Input
  • SDA (4): Serial Data Input/Output
  • RST (5): Reset Input
  • INT (6): Interrupt Output

(Tip: For detailed pinout information, please refer to the corresponding datasheet.)

Key Features

  • High-Reliability Memory: Provides high-reliability memory solutions for industrial applications.
  • Low Power Consumption: Designed for low power operation, making it suitable for battery-powered devices and other power-constrained systems.
  • Accurate Timekeeping: Offers accurate timekeeping capabilities, ensuring reliable timing and synchronization in industrial control systems.

Applications

The DS1742W-120+ is suitable for various applications that require high-reliability memory and accurate timekeeping, including:

  • Industrial control systems
  • Automation equipment
  • Embedded systems
  • Battery-powered devices

Where to Use

The DS1742W-120+ is ideal for use in industrial environments where high-reliability memory and accurate timekeeping are critical, such as:

  • Manufacturing facilities
  • Power generation and distribution systems
  • Aerospace and defense applications

How to Use

To use the DS1742W-120+, connect the VCC pin to a suitable power supply, the GND pin to ground, and the SCL and SDA pins to a serial clock and data input/output respectively. Apply a reset signal to the RST pin to initialize the device. The INT pin can be used to generate an interrupt signal.

(Tip: For detailed usage instructions, refer to the datasheet.)

Application Circuit

The application circuit diagram for the DS1742W-120+ illustrates how to connect the device to a microcontroller or other system. It includes connections for power supply, ground, and serial clock and data input/output.

(Tip: For detailed circuit diagram connections and usage guide, refer to the datasheet.)

Equivalents

  • DS1742W-100+: A similar high-reliability RTC from Analog Devices Inc./Maxim Integrated with comparable features and performance.
  • MAX1550: An alternative high-reliability RTC from Maxim Integrated with equivalent functionality.

Complementary

The DS1742W-120+ can be complemented by other Analog Devices Inc./Maxim Integrated products, such as the MAX1550, which offers additional features and performance for industrial applications.

(Tip: When selecting complementary devices, ensure that their features and specifications align with your specific application requirements for optimal performance and compatibility.)

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Product Category ! Real Time Clock RoHS Details
Mounting Style Through Hole Package / Case EDIP-24
RTC Bus Interface Parallel Date Format ! YYYY-MM-DD
Time Format ! HH:MM:SS RTC Memory Size 2 kB
Supply Voltage - Max 3.6 V Supply Voltage - Min 3 V
Minimum Operating Temperature 0 C Maximum Operating Temperature ! + 70 C
Brand Analog Devices / Maxim Integrated Function Calendar, Clock, NV Timekeeping RAM
Operating Supply Current 15 mA Product Type ! Real Time Clocks
Series DS1742W Factory Pack Quantity 14
Subcategory Clock & Timer ICs Part # Aliases DS1742W 90-1742W+120
Unit Weight 0.021164 oz

Datasheet PDF

Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.

Preliminary Specification DS1742W-120+ PDF Download

FAQs

What is DS1742W-120+?

The DS1742W-120+ is a non-volatile static RAM (NVSRAM) module with a real-time clock/calendar (RTC) function designed by Maxim Integrated. It combines the features of a static RAM with the non-volatile storage capability, making it ideal for applications requiring data retention in power-off situations, such as industrial automation, event logging, and data backup systems.

How Does DS1742W-120+ Work?

The DS1742W-120+ functions as a dual-purpose memory module by providing both random access memory (RAM) storage and non-volatile storage using a small onboard lithium coin cell battery. It maintains data integrity during power loss by automatically switching to battery power. The real-time clock/calendar feature ensures accurate timekeeping even when the main power source is off.

How Many Pins does DS1742W-120+ have and What are the Functions of the Pinout Configuration?

The DS1742W-120+ is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:

  • VCC: Power supply pin.
  • GND: Ground pin.
  • CE, VBAT: Chip enable and battery input for non-volatile operation.
  • SRAM: Static RAM data/control pins.
  • RTC: Real-time clock/calendar pins.
  • X1, X2: Crystal oscillator connections.
  • IRQ: Interrupt output pin.

What are the Pros and Cons of DS1742W-120+?

Pros:

  • Non-Volatile Data Storage: Retains data even during power loss, ensuring data integrity.
  • Real-Time Clock: Provides accurate timekeeping functionality.
  • Integrated Solution: Combines static RAM and RTC in a single module for convenience.
  • Battery Backup: Utilizes a long-life battery for reliable non-volatile operation.
  • Wide Operating Voltage Range: Supports operation over a range of voltages for versatility.

Cons:

  • Cost: NVSRAM solutions like the DS1742W-120+ may have a higher cost compared to standard SRAM modules.
  • Complexity: Requires careful handling and consideration of battery replacement for continued non-volatile operation.
  • Limited Endurance: Non-volatile memory may have limited write endurance compared to standard RAM.

Are There Any Equivalents/Alternatives to DS1742W-120+ for Recommendation?

  • The DS1245 from Maxim Integrated is a similar NVSRAM module with additional features.
  • Alternatives to the DS1742W-120+ include the FM1608 from Cypress Semiconductor and the M48Z02 from STMicroelectronics.

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