MAX6921 Maxim Integrated Products, MAX6921 Datasheet
MAX6921
Available stocks
Related parts for MAX6921
MAX6921 Summary of contents
Page 1
... The MAX6931 has a negative supply voltage input, V 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) ...
Page 2
... (MAX6931 only) .....................................-0.3V to +80V BB SS OUT_ (MAX6921 only) ..................(GND - -0.3V OUT_ (MAX6931 only) ....................(V - -0.3V All Other Pins..............................................-0. OUT_ Continuous Source Current ....................................-45mA OUT_ Pulsed (1ms max, 1/4 max duty) Source Current ...-80mA Total OUT_ Continuous Source Current .........................-540mA Total OUT_ Continuous Sink Current ...
Page 3
... ELECTRICAL CHARACTERISTICS (continued) (Typical Operating Circuit 76V wise noted.) (Note 1) PARAMETER SYMBOL Low-Voltage OUT_ (MAX6921 Only) Low-Voltage OUT_ (MAX6931 Only) Rise Time OUT_ (20% to 80%) Fall Time OUT_ (80% to 20%) SERIAL INTERFACE TIMING CHARACTERISTICS LOAD Rising to OUT_ Falling Delay LOAD Rising to OUT_ Rising ...
Page 4
Serial-Interfaced VFD Tube Drivers ELECTRICAL CHARACTERISTICS (continued) (Typical Operating Circuit 76V wise noted.) (Note 1) PARAMETER SYMBOL Rise and Fall Time DOUT CLK Clock Period t CLK Pulse-Width High t CLK Pulse-Width ...
Page 5
... BB 80 100 120 VFD Tube Drivers OUTPUT VOLTAGE ( vs. TEMPERATURE (OUTPUT HIGH -40mA OUT 40V 76V BB 0 -40 - 100 120 TEMPERATURE (°C) OUTPUT RISE AND FALL WAVEFORM MAX6921/31 toc07 BLANK 2V/div OUT_ 20V/div 1µs/div 5 ...
Page 6
... CLK DIN LOAD BLANK Figure 1. MAX6921/MAX6931 Functional Diagram 6 _______________________________________________________________________________________ NAME OUT0 to VFD Anode and Grid Drivers. OUT0 to OUT19 are push-pull outputs swinging OUT19 from OUT0 to VFD Anode and Grid Drivers. OUT0 to OUT19 are push-pull outputs swinging ...
Page 7
... The shift register is written through a clock input CLK and a data input DIN. For the MAX6921, the data propagates to a data output DOUT. The data output allows multiple drivers to be cascaded and operated together. The output latch is ...
Page 8
... P = Present state (shift register Previous state (latched). Writing Device Registers Using the 4-Wire Serial Interface The MAX6921/MAX6931 are normally written using the following sequence: 1) Take CLK low. 2) Clock 20 bits of data in order D19 first to D0 last into DIN, observing the data setup and hold times. ...
Page 9
... Determine the power dissipation (P MAX6921/MAX6931 for static tube drivers with the fol- lowing equation where number of anodes driven (the MAX6921/MAX6931 can drive a maximum of 20). I ANODE ( mum anode current I ...
Page 10
... grounded while the other supply or supplies are maintained up to their maximum ratings. However, as with any CMOS device, do not drive the MAX6921/ MAX6931s’ logic inputs if the logic supply V operational because the input protection diodes clamp the signals. Cascading Drivers (MAX6921 Only) Multiple MAX6921s may be cascaded, as shown in the Typical Application Circuit, by connecting each driver’ ...
Page 11
... OUT11 OUT17 12 17 OUT12 OUT16 13 16 OUT13 OUT15 14 15 OUT14 TSSOP OUT1 5 25 OUT2 6 24 OUT3 7 23 MAX6921AQI 22 OUT4 OUT5 10 20 OUT6 11 19 OUT7 PLCC Pin Configurations OUT4 1 28 OUT5 OUT3 2 27 OUT6 OUT2 3 ...
Page 12
Serial-Interfaced VFD Tube Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 12 ______________________________________________________________________________________ Package Information ...
Page 13
For the latest package outline information www.maxim-ic.com/packages TOP VIEW FRONT VIEW ______________________________________________________________________________________ 20-Output, 76V, Serial-Interfaced Package Information (continued) ...
Page 14
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products ...