MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver General Description Features The MAX6920 is a 12-output, 76V, vacuum fluo- 5MHz Industry-Standard 4-Wire Serial Interface rescent display (VFD) tube driver that interfaces a 3V to 5.5V Logi c Supply Range multiplexed VFD tube to a VFD controller such as the 8V to 76V Grid/Anode Supply Range MAX6850MAX6853 or to a microcontroller. The MAX6920 is also ideal for driving either static VFD tubes Push-Pull CMOS High-Voltage Outputs or telecom relays. Outputs can Source 40mA, Sink 4mA Continuously Data is inputted using an industry-standard 4-wire serial Outputs can Source 75mA Repetitive Pulses interface (CLOCK, DATA, LOAD, BLANK) for compatibil- Outputs can be Paralleled for Higher Current Drive ity with both industry-standard drivers and Maxims VFD Any Output can be Used as a Grid or an Anode controllers. Driver For easy display control, the active-high BLANK input Blank Input Simplifies PWM Intensity Control forces all driver outputs low, turning the display off, and automatically puts the MAX6920 into shutdown mode. Small 20-Pin SO Package Display intensity may also be controlled by pulse-width -40C to +125C Temperature Range 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 pack- age. Maxim also offers VFD drivers with either 20 (MAX6921/MAX6931) or 32 outputs (MAX6922 and MAX6932). Applications Ordering Information White Goods Industrial Weighing PART TEMP RANGE PIN-PACKAGE Gaming Machines Security MAX6920AWP -40 C to +125 C 20 Wide SO Avionics Telecom Pin Configuration Typical Operating Circuit TOP VIEW +5V +60V C1 C2 V 1 20 V BB CC 100nF 100nF DOUT 2 19 DIN 20 1 OUT11 3 18 OUT0 V V CC BB OUT10 4 17 OUT1 C MAX6920 OUT9 5 16 OUT2 12 MAX6920AWP 19 VFDOUT DIN OUT0 OUT11 OUT8 6 15 OUT3 11 VFCLK CLK OUT7 7 14 OUT4 12 VFLOAD LOAD OUT6 8 13 OUT5 9 VFBLANK BLANK BLANK 9 12 LOAD GND GND 10 11 CLK 10 19-3061 Rev 1 8/14 VFD TUBEMAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver Absolute Maximum Ratings Voltage (with respect to GND) OUT Sink Current .............................................................15mA V ....................................................................-0.3V to +80V CLK, DIN, LOAD, BLANK, DOUT Current ......................10mA BB V ......................................................................-0.3V to +6V Continuous Power Dissipation CC OUT .....................................................-0.3V to (V + 0.3V) 20-Pin Wide SO (derate 10mW/C over T = +70C) ....800mW BB A All Other Pins ....................................... -0.3V to (V + 0.3V) Operating Temperature Range (T to T ) -40C to +125C CC MIN MAX OUT Continuous Source Current ...................................-45mA Junction Temperature ......................................................+150C OUT Pulsed (1ms max, 1/4 max duty) Source Current ....-80mA Storage Temperature Range ............................ -65C to +150C Total OUT Continuous Source Current ........................-540mA Lead Temperature (soldering, 10s) .................................+300C Total OUT Continuous Sink Current ................................60mA Total OUT Pulsed (1ms max, 1/4 max duty) Source Current ...........................................................-960mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (Typical Operating Circuit, V = 8V to 76V, V = 3V to 5.5V, T = T to T , unless otherwise noted.) (Note 1) BB CC A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Logic Supply Voltage V 3 5.5 V CC Tube Supply Voltage V 8 76 V BB T = +25C 72 170 All outputs OUT A low, CLK = idle T = -40C to +125C 200 A Logic Supply Operating Current I A CC T = +25C 350 650 All outputs OUT A high, CLK = idle T = -40C to +125C 700 A T = +25C 1 2 A All outputs OUT low T = -40C to +125C 4.2 A I Tube Supply Operating Current BB mA T = +25C 0.53 0.85 All outputs OUT A high T = -40C to +125C 0.9 A T = +25C V - 1.1 A BB V 15V, BB T = -40C to +85C V - 2 A BB I = -25mA OUT T = -40C to +125C V - 2.5 A BB T = -40C to +85C V - 3.5 V 15V, A BB BB High-Voltage OUT V V H I = -40mA T = -40C to +125C V - 4.0 OUT A BB T = +25C V - 1.2 A BB 8V < V < 15V, BB T = -40C to +85C V - 2.5 A BB I = -25mA OUT T = -40C to +125C V - 3.0 A BB T = +25C 0.75 1 A V 15V, BB T = -40C to +85C 1.5 A I = 1mA OUT T = -40C to +125C 1.9 A Low-Voltage OUT V V L T = +25C 0.8 1.1 A 8V < V < 15V, BB T = -40C to +85C 1.6 A I = 1mA OUT T = -40C to +125C 2.0 A Maxim Integrated 2 www.maximintegrated.com