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MAX6921, MAX6931

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

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Status Explanations for product status codes

Part Number Status
MAX6921 Active: In Production. See Ordering Information for details.
MAX6931 Active: In Production.

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).

Data Sheet

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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
  • Underwriters Laboratories (UL) Recognized
 

Applications/Uses

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

Key Specifications:

VFD Display Drivers
Part Number Controller/ Drvr. Display Type Interface Cursor Control Blink Cntrl. VSUPPLY
(V)
Budgetary
Price
See Notes
MAX6921  Driver Any type Serial 4-Wire No No 8.0 to 76.0 $3.04 @1k
MAX6931 
3.5 to 5.5
8.0 to 76.0
$3.45 @1k
See All VFD Display Drivers (7)

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.



Diagram

MAX6921, MAX6931: Typical Operating Circuit
Typical Operating Circuit

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Overview

 

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Ordering Info

 

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Description
Key Features
Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
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Document Ref.: 19-3020 Rev 1; 2010-08-12
This page last modified: 2010-08-12