12-Output, 76V, Serial-Interfaced VFD Tube Driver

76V, 12- and 20-Output, Serial-Interfaced VFD Drivers Continuously Source 40mA with Slew-Rate Limiting to Reduce EMI


The MAX6920 is a 12-output, 76V, vacuum fluorescent display (VFD) tube driver that interfaces a multiplexed VFD tube to a VFD controller such as the MAX6850-MAX6853 or to a microcontroller. The MAX6920 is also ideal for driving either static VFD tubes or telecom relays.

Data is inputted using an industry-standard 4-wire serial interface (CLOCK, DATA, LOAD, BLANK) for compatibility with both industry-standard drivers and Maxim's VFD controllers.

For easy display control, the active-high BLANK input forces all driver outputs low, turning the display off, and automatically puts the MAX6920 into shutdown mode. Display intensity may also be controlled by pulse-width modulating the BLANK input.

The MAX6920 has a serial interface data output pin, DOUT, allowing any number of devices to be cascaded on the same serial interface.

The MAX6920 is available in a 20-pin SO package. Maxim also offers VFD drivers with either 20 (MAX6921/MAX6931) or 32 outputs (MAX6922 and MAX6932).
MAX6920: Typical Operating Circuit MAX6920: 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
  • 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
  • Small 20-Pin SO Package
  • -40°C to +125°C Temperature Range


  • Avionics
  • Gaming Machines
  • Industrial Weighing
  • Security
  • Telecom
  • White Goods
Part Number Controller/ Drvr. Display Type Interface Cursor Control Blink Cntrl. VSUPPLY
Package/Pins Budgetary
See Notes
MAX6920  Driver Any type Serial 4-Wire No No 8.0 to 76.0
$2.66 @1k
See All VFD Display Drivers (5)
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.

Technical Documents

Tutorial 1154 Vacuum-Fluorescent-Display (VFD) Tube Manufacturers' Web Sites

Quality and Environmental Data

Request Reliability Report for: MAX6920 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources