MAX6921/MAX6931 19-3020 Rev 1 4/10 20-Output, 76V, Serial-Interfaced VFD Tube Drivers General Description Features The MAX6921/MAX6931 are 20-output, 76V, vacuum- 5MHz Industry-Standard 4-Wire Serial Interface fluorescent display (VFD) tube drivers that interface a 3V to 5.5V Logic 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 MAX6921/MAX6931 are also ideal for driving static VFD -11V to 0V Filament Bias Supply (MAX6931 Only) tubes or telecom relays. Push-Pull CMOS High-Voltage Outputs Data is input using an industry standard 4-wire serial Outputs can Source 40mA, Sink 4mA interface (CLOCK, DATA, LOAD, BLANK), compatibile Continuously with either Maxims or industry-standard VFD driver and Outputs can Source 75mA Repetitive Pulses controller. Outputs can be Paralleled for Higher Current Drive For easy display control, the active-high BLANK input forces all driver outputs low, turning the display off, and Any Output can be Used as a Grid or an Anode automatically puts the MAX6921/MAX6931 into shut- Driver down mode. Display intensity can also be controlled by Blank Input Simplifies PWM Intensity Control directly pulse-width modulating the BLANK input. Small 28-Pin TSSOP Package The MAX6921 has a serial interface data output, DOUT, -40C to +125C Temperature Range allowing any number of devices to be cascaded on the same serial interface. Ordering Information The MAX6931 has a negative supply voltage input, V , SS allowing the drivers output swing to be made bipolar to PART TEMP RANGE PIN-PACKAGE simplify filament biasing in many applications. MAX6921AUI+ -40C to +125C 28 TSSOP The MAX6921 is available in 28-pin TSSOP, SO, and MAX6921AWI/V+ -40C to +125C 28 Wide SO PLCC packages. The MAX6931 is available in a 28-pin MAX6921AQI+ -40C to +125C 28 PLCC TSSOP package. MAX6931AUI+ -40C to +125C 28 TSSOP Maxim also offers 12-output VFD drivers (MAX6920) and +Denotes a lead-free(Pb)/RoHS-compliant package. 32-output VFD drivers (MAX6922/MAX6932). /V denotes an automotive qualified part. Typical Operating Circuit Applications White Goods Industrial Weighing Gaming Machines Security +5V +60V C2 C1 Automotive Telecom 100nF 100nF Avionics VFD Modules 7 8 V V Instrumentation Industrial Control CC BB C MAX6931 6 20 VFDOUT DIN OUT0OUT19 22 VFCLK CLK 23 VFLOAD LOAD 20 VFBLANK BLANK V GND SS 921 -7V C3 100nF Pin Configurations appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. VFD TUBE20-Output, 76V, Serial-Interfaced VFD Tube Drivers ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V .........................................................................-0.3V to +80V 28-Pin TSSOP (derate 12.8mW/C BB V ...........................................................................-0.3V to +6V over +70C)................................................................1025mW CC V (MAX6931 only)...............................................-12V to +0.3V 28-Pin Wide SO (derate 12.5mW/C SS V - V (MAX6931 only) .....................................-0.3V to +80V over +70C)................................................................1000mW BB SS OUT (MAX6921 only) ..................(GND - -0.3V) to (V + 0.3V) 28-Pin PLCC (derate 10.5mW/C BB OUT (MAX6931 only) ....................(V - -0.3V) to (V + 0.3V) over +70C)..................................................................842mW SS BB All Other Pins..............................................-0.3V to (V + 0.3V) Operating Temperature Range CC OUT Continuous Source Current ....................................-45mA (T to T ) ...............................................-40C to +125C MIN MAX OUT Pulsed (1ms max, 1/4 max duty) Source Current ...-80mA Junction Temperature......................................................+150C Total OUT Continuous Source Current .........................-540mA Storage Temperature Range .............................-65C to +150C Total OUT Continuous Sink Current .................................90mA Lead Temperature (soldering, 10s) .................................+300C Total OUT Pulsed (1ms max, 1/4 max duty) Soldering Temperature (reflow) Source Current ...........................................................-960mA Wide SO, TSSOP lead(Pb)-free ...................................+260C OUT Sink Current .............................................................15mA PLCC lead(Pb)-free......................................................+245C CLK, DIN, LOAD, BLANK, DOUT Current .......................10mA 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, V = -11V to 0V, V - V 76V, T = T to T , unless other- BB CC SS BB SS A MIN MAX wise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Logic Supply Voltage V 3 5.5 V CC Tube Supply Voltage V 876V BB Bias Supply Voltage V -11 0 V SS (MAX6931 Only) Total Supply Voltage V - V 76 V BB SS (MAX6931 Only) T = +25C 78 170 All outputs OUT low, A CLK = idle T = -40C to +125C 200 A Logic Supply Operating Current I A CC T = +25C 540 900 A All outputs OUT high, CLK = idle T = -40C to +125C 1000 A T = +25C 1.65 3.0 A All outputs OUT low T = -40C to +125C 6.9 A Tube Supply Operating Current I mA BB T = +25C 0.85 1.3 A All outputs OUT high T = -40C to +125C 1.4 A T = +25C -0.8 -0.38 A All outputs OUT low T = -40C to +125C -1.9 Bias Supply Operating Current A I mA SS (MAX6931 Only) T = +25C -1.4 -0.87 A All outputs OUT high T = -40C to +125C -1.5 A 2 MAX6921/MAX6931