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MAX6974, MAX6975
24-Output PWM LED Drivers for Message Boards

EZCascade™ LVDS Serial Interface Running at 35Mbps for Easy and Economical Designing and Manufacturing of Large Displays


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 332kB)
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Description
The MAX6974/MAX6975 precision current-sinking, 24-output PWM LED drivers drive red, green, and blue LEDs for full-color graphic message boards and video displays. Each output has an individual 12-bit (MAX6974) or 14-bit (MAX6975) PWM-intensity (hue) control and 7-bit (MAX6974) or 5-bit (MAX6975) global PWM intensity (luminance) control. The MAX6974/MAX6975 feature a high-speed, fully buffered cascadable serial interface, open-circuit LED fault detection circuitry, as well as a watchdog timer.

The driver has three banks of eight outputs, with each bank intended to drive a different color in RGB applications. The full-scale current for each bank of eight outputs is adjustable from 6mA to 30mA in 256 steps (0.3125% per step) to calibrate each color.

The MAX6974/MAX6975 can optionally multiplex by using outputs active-low MUX0 and active-low MUX1, which each drive an external pnp transistor. Multiplexing doubles the MAX6974/MAX6975 drive capability to 48 LEDs.

The MAX6974/MAX6975 operate from a 3.0V to 3.6V power supply. The LED power supply can range from 3V to 7V. The LED drivers require only 0.8V headroom above the LEDs' forward-voltage drop. Using a separate LED supply voltage for each LED minimizes power consumption.

The serial interface uses differential signaling for the high-speed clock and data signals to reduce EMI and improve signal integrity. The MAX6974/MAX6975 buffer all interface signals to simplify cascading devices in modules that use a large number of drivers.

An internal watchdog timer, when enabled, automatically clears the pixel-data registers and blanks the display if any of the signal inputs fail to toggle within 40ms.

The MAX6974/MAX6975 are available in 40-pin TQFN packages and operate over the -40°C to +125°C temperature range.

Refer to the MAX6972/MAX6973 data sheet for a 16-output, 11mA to 55mA software-compatible device.

An evaluation kit is available:  MAX6974EVKIT  

Key Features   Applications/Uses
  • 24 LED Current Sink Outputs (Three Banks of Eight Outputs)
  • 48 LED Drive Option When Multiplexing
  • 33MHz Clock Supports Up to 63 Frames per Second of Video
  • Constant Output Current Calibration from 6mA to 30mA in 256 Steps
  • EZCascade™ Interface Simplifies Multiple Driver Cascading Without External Buffers
  • 12-Bit or 14-Bit Individual PWM LED Intensity Controls
  • 7-Bit or 5-Bit Panel PWM-Intensity Control
  • +3V to +7V LED Power Supply
  • +3.0V to +3.6V Logic Supply
  • Open-Circuit LED Fault Detection
  • Optional Watchdog Timer Blanks Display if Interface Fails
  • Standard -40°C to +125°C Operating Temperature Range

 
  • Graphic Panels
  • LED Message Boards
  • LED Video Display Panels
  • Signs
  • Variable Message Signs (VMS)

    Diagram
    MAX6974, MAX6975: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 4111: Eliminating Ghost-Image Currents in Color-LED Display Systems Using the MAX6972–MAX6975 LED Drivers - MAX6974, MAX6975
  • Application Note 4208: Designing an LED-Based Video-Display Board - MAX6974

    Evaluation Kits
  • MAX6974EVKIT

    Design Guides
  • High-Speed Interconnect (PDF)
  • Displays (PDF)

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    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: 1-6 of 6

    MAX6974 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6974ATL+  
    Active TQFN;40 pin;37.2 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0054 (PDF)
    Use pkgcode/variation: T4066+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6974ATL+T    
    Active

    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX6975 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6975ATL+T    
    Active

    Land Pattern: Not Available

    -40°C to +125°C See data sheet
    MAX6975ATL+  
    Active TQFN;40 pin;37.2 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0054 (PDF)
    Use pkgcode/variation: T4066+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6975ATL  
    Active TQFN;40 pin;37.2 mm²
    Outline Drawing: 21-0141 (PDF)
    Land Pattern: 90-0054 (PDF)
    Use pkgcode/variation: T4066-3*
    -40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6975ATL-T    
    Active

    Land Pattern: Not Available

    -40°C to +125°C See data sheet

    More Information
  • New Product Press Release 2006-05-31 

    Related Products
    MAX6971 16-Port, 36V Constant-Current LED Driver
    MAX6979 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog
    MAX6969 16-Port, 5.5V Constant-Current LED Driver
    MAX6974, MAX6975 24-Output PWM LED Drivers for Message Boards
    MAX6960, MAX6961, MAX6962, MAX6963 4-Wire Serially Interfaced 8 x 8 Matrix Graphic LED Drivers

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    Document Ref.: 19-0555; Rev 2; 2007-10-17
    This page last modified: 2008-06-19


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