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

Product Details

Key Features

Applications/Uses

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Parametric specs for VFD Display Drivers
Controller/ Driver Driver
Display Type Any type
Interface Serial 4-Wire
Cursor Control No
Blink Cntrl. No
VSUPPLY (V) 8.0 to 76.0
Package/Pins PLCC/28
SOIC (W)/28
TSSOP/28
Budgetary
Price (See Notes)
$4.18 @1k
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Simplified Block Diagram

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Parameters

Parametric specs for VFD Display Drivers
Controller/ Driver Driver
Display Type Any type
Interface Serial 4-Wire
Cursor Control No
Blink Cntrl. No
VSUPPLY (V) 8.0 to 76.0
Package/Pins PLCC/28
SOIC (W)/28
TSSOP/28
Budgetary
Price (See Notes)
$4.18 @1k

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

Applications/Uses

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

Description

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).

Simplified Block Diagram

MAX6921, MAX6931: Typical Operating Circuit MAX6921, MAX6931: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .