MAX6931:20-Output, 76V, Serial-Interfaced VFD Tube Drivers

The MAX6921/MAX6931 are 20-output, 76V, vacuum-fluorescent display (VFD) tube drivers that interface a multiplexed VFD tube to a VFD controller, such as the MAX6850–MAX6853, or to a microcontroller. The MAX6921/MAX6931 are also ideal for driving static VFD tubes or telecom relays. Data is input using an industry standard 4-wire serial interface (CLOCK, DATA, LOAD, BLANK), compatibile with either Maxim's or industry-standard VFD driver and controller. For easy display control, the active-high BLANK input forces all driver outputs low, turning the display off, and automatically puts the MAX6921/MAX6931 into shutdown mode. Display intensity can also be controlled by directly pulse-width modulating the BLANK input. The MAX6921 has a serial interface data output, DOUT, allowing any number of devices to be cascaded on the same serial interface. The MAX6931 has a negative supply voltage input, VSS, allowing the drivers' output swing to be made bipolar to simplify filament biasing in many applications. The MAX6921 is available in 28-pin TSSOP, SO, and PLCC packages. The MAX6931 is available in a 28-pin TSSOP package. Maxim also offers 12-output VFD drivers (MAX6920) and 32-output VFD drivers (MAX6922/MAX6932).

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 (MAX6931 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
  • Small 28-Pin TSSOP Package
  • -40°C to +125°C Temperature Range
MAX6921, MAX6931: Typical Operating Circuit
MAX6921, MAX6931: Typical Operating Circuit
  • Automotive
  • Avionics
  • Gaming Machines
  • Industrial Control
  • Industrial Weighing
  • Instrumentation
  • Security
  • Telecom
  • VFD Modules
  • White Goods
titleDownload file
MAX6921-MAX6931 Data SheetMAX6921-MAX6931.pdf
Part NumberController/ Drvr.Display TypeInterfaceCursor ControlBlink Cntrl.VSUPPLY
See Notes
MAX6921DriverAny typeSerial 4-WireNoNo8.0 to 76.0PLCC/28
$3.98 @1k
MAX69313.5 to 5.5
8.0 to 76.0
Related Products
  • MAX6933:27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers
  • MAX6934:27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers
  • MAX6922:27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers
  • MAX6932:27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers
  • MAX6920:12-Output, 76V, Serial-Interfaced VFD Tube Driver
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6931AUINo Longer AvailableMAX6931AUI+TSSOP,;28 pin;64.7 mm²-40°C to +125°CNo
MAX6931AUI+ActiveTSSOP,;28 pin;64.7 mm²-40°C to +125°CLead Free
MAX6931AUI+TActiveTSSOP,;28 pin;64.7 mm²-40°C to +125°CLead Free
MAX6931AUI-TNo Longer AvailableMAX6931AUI+TTSSOP;28 pin-40°C to +125°CSee data sheet
MAX6921-MAX6931.pdf MAX6931
MAX6921-MAX6931.pdf MAX6931