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DS2490
USB to 1-Wire Bridge Chip

Not Recommended for New Designs
Part Number Replacement Explanation
DS2490S n/a The DS2490 remains available but is not recommended for new designs. The DS2480B and DS2482S-100 alternatively provide either UART/RS232 or I2C to 1-Wire interface solutions.
DS2490S+ n/a
DS2490Y n/a
DS2490S+T&R n/a


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Data Sheet
FULL DATA SHEET (PDF, 800kB)
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Description
The DS2490 is a bridge chip that enables communication between a USB host system and a 1-Wire® bus. It provides regular, overdrive, and flexible 1-Wire communication speeds and a full-speed 12Mbps connection to USB. USB vendor-specific commands defined in this specification are used to control the DS2490 and communicate with attached 1-Wire devices. A functional block diagram of the DS2490 is shown in Figure 1 of the full data sheet.

Key Features
  • Communicates at regular and overdrive 1-Wire speeds
  • Supports stiff 5V pullup for EEPROM, sensors, and crypto iButton®
  • Slew rate controlled 1-Wire timing and active pullup to accommodate long 1-Wire network lines and reduce radiation
  • Programmable 1-Wire timing and driver characteristics accommodate a wide range of 1-Wire network configurations
  • Low- to high-level command types, including macros, for generating 1-Wire communication
  • Crystal oscillator timebase provides precision timed 1-Wire waveforms
  • High-speed 12Mbps Universal Serial Bus (USB) interface
  • Integrated USB-compliant transceiver
  • Supports USB remote wake-up from a 1-Wire device event to resume a suspended host system
  • 0°C to +70°C operating temperature range

Application Notes
  • Application Note 117: DS2490 Universal Serial Bus Descriptors - DS2490
  • Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS2490
  • Application Note 193: Extending 1-Wire Range with Network Proxies - DS2490
  • Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS2490
  • Application Note 1740: White Paper 6: 1-Wire Drivers Installation Guide for Windows - DS2490
  • Application Note 3358: OneWireViewer User's Guide - DS2490
  • Application Note 3438: Serial Digital Data Networks - DS2490
  • Application Note 3829: Determining the Recovery Time for Multiple-Slave 1-Wire Networks - DS2490
  • Application Note 3874: Simple Characterization Circuit for Rechargeable AA Cells - DS2490
  • Application Note 4206: Choosing the Right 1-Wire® Master for Embedded Applications - DS2490

    Evaluation Kits
    none

    Design Guides
  • 1-Wire® PRODUCTS (PDF)

    Reliability Reports
  • Reliability Report: DS2490.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-4 of 4

    DS2490 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS2490S  
    SOIC;24 pin;
    Dwg: 21-0042 (PDF)
    Use pkgcode/variation: W24-4*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS2490Y  
    SOIC;24 pin;
    Dwg: 21-0042 (PDF)
    Use pkgcode/variation: W24-4*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS2490S+  
    SOIC;24 pin;
    Dwg: 21-0042 (PDF)
    Use pkgcode/variation: W24+4*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2490S+T&R  
    SOIC;24 pin;
    Dwg: 21-0042 (PDF)
    Use pkgcode/variation: W24+4*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

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    Document Ref.: 033199; 2007-12-14
    This page last modified: 2008-05-09



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