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

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).

Applications

* Avionics * Gaming Machines * Industrial Weighing * Security * Telecom * White Goods

* 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