27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers

76V, 27-, 28-, and 32-Output, Serial-Interfaced VFD Drivers Continuously Source 40mA with Slew-Rate limiting to Reduce EMI

Please check latest availability status for a specific part variant.


The MAX6922/MAX6932/MAX6933/MAX6934 multi-output, 76V, vacuum-fluorescent display (VFD) tube drivers that interface a VFD tube to a microcontroller or a VFD controller, such as the MAX6850–MAX6853. The MAX6922/MAX6934 have 32 outputs, while the MAX6932 has 27 outputs, and the MAX6933 has 28 outputs. All devices are also suitable for driving telecom relays.

Data is input using standard 4-wire serial interface (CLOCK, DATA, LOAD, BLANK) compatible with other VFD drivers and controllers.

For easy display control, the active-high BLANK input forces all driver outputs low, turning the display off, and automatically puts the IC into shutdown mode. Display intensity may also be controlled by directly pulse-width modulating the BLANK input.

The MAX6922/MAX6932/MAX6934 have a serial interface data output, DOUT, allowing any number of devices to be cascaded on the same serial interface.

The MAX6932/MAX6933/MAX6934 have a negative supply voltage input, VSS, allowing the drivers' output swing to be made bipolar to simplify filament biasing in many applications.

The MAX6922 is available in a 44-pin PLCC package, the MAX6932 and MAX6933 are available in 36-pin SSOP packages, and the MAX6934 is available in 44-pin PLCC and TQFN packages.

Maxim also offers a 12-output VFD driver (MAX6920) and 20-output VFD drivers (MAX6921/MAX6931).
MAX6922, MAX6932, MAX6933, MAX6934: Typical Operating Circuit MAX6922, MAX6932, MAX6933, MAX6934: Typical Operating Circuit Enlarge+

Key Features

  • 5MHz Industry-Standard 4-Wire Serial Interface
  • 3V to 5.5V Logic Supply Range
  • 8V to 76V Grid/Anode Supply Range
  • -11V to 0V Filament Bias Supply (MAX6932/MAX6933/MAX6934 Only)
  • Push-Pull CMOS High-Voltage Outputs
  • Outputs Can Source 40mA, Sink 4mA Continuously
  • Outputs Can Source 75mA Repetitive Pulses
  • Outputs Can Be Paralleled for Higher Current Drive
  • Any Output Can Be Used as a Grid or an Anode Driver
  • BLANK Input Simplifies PWM Intensity Control
  • -40°C to +125°C Temperature Range as Standard


  • Avionics
  • Gaming Machines
  • Industrial Control
  • Industrial Weighing
  • Instrumentation
  • Security
  • Telecom
  • VFD Modules
  • White Goods

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX6934.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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