●White Goods
●Gaming Machines
●Avionics
●Industrial Weighing
●Security
●Telecom
General Description
The MAX6920 is a 12-output, 76V, vacuum fluo-
rescent 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 compatibil-
ity 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 pack-
age. Maxim also offers VFD drivers with either 20
(MAX6921/MAX6931) or 32 outputs (MAX6922 and
MAX6932).
Features
● 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
Applications
PART TEMP RANGE PIN-PACKAGE
MAX6920AWP -40°C to +125°C 20 Wide SO
MAX6920
DIN
CLK
LOAD
OUT0 – OUT11
VFD TUBE
VFDOUT
VFLOAD
VFCLK
BLANK
VFBLANK
120
19
12
11
9
10
12
VCC
GND
VBB
+60V+5V
C1
100nF
C2
100nF
µC
TOP VIEW
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
VCC
DIN
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
LOAD
CLKGND
BLANK
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
DOUT
VBB
MAX6920AWP
Typical Operating Circuit
Ordering Information
Pin Conguration
MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
19-3061; Rev 1; 8/14
Voltage (with respect to GND)
VBB ....................................................................-0.3V to +80V
VCC ...................................................................... -0.3V to +6V
OUT_ .....................................................-0.3V to (VBB + 0.3V)
All Other Pins ....................................... -0.3V to (VCC + 0.3V)
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 ................................60mA
Total OUT_ Pulsed (1ms max, 1/4 max duty)
Source Current ...........................................................-960mA
OUT_ Sink Current ............................................................. 15mA
CLK, DIN, LOAD, BLANK, DOUT Current ......................±10mA
Continuous Power Dissipation
20-Pin Wide SO (derate 10mW/°C over TA = +70°C) ....800mW
Operating Temperature Range (TMIN to TMAX) -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(Typical Operating Circuit, VBB = 8V to 76V, VCC = 3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic Supply Voltage VCC 3 5.5 V
Tube Supply Voltage VBB 8 76 V
Logic Supply Operating Current ICC
All outputs OUT_
low, CLK = idle
TA = +25°C 72 170
µA
TA = -40°C to +125°C 200
All outputs OUT_
high, CLK = idle
TA = +25°C 350 650
TA = -40°C to +125°C 700
Tube Supply Operating Current IBB
All outputs OUT_ low
TA = +25°C 1 2
mA
TA = -40°C to +125°C 4.2
All outputs OUT_
high
TA = +25°C 0.53 0.85
TA = -40°C to +125°C 0.9
High-Voltage OUT_ VH
VBB ≥ 15V,
IOUT = -25mA
TA = +25°C VBB - 1.1
V
TA = -40°C to +85°C VBB - 2
TA = -40°C to +125°C VBB - 2.5
VBB ≥ 15V,
IOUT = -40mA
TA = -40°C to +85°C VBB - 3.5
TA = -40°C to +125°C VBB - 4.0
8V < VBB < 15V,
IOUT = -25mA
TA = +25°C VBB - 1.2
TA = -40°C to +85°C VBB - 2.5
TA = -40°C to +125°C VBB - 3.0
Low-Voltage OUT_ VL
VBB ≥ 15V,
IOUT = 1mA
TA = +25°C 0.75 1
V
TA = -40°C to +85°C 1.5
TA = -40°C to +125°C 1.9
8V < VBB < 15V,
IOUT = 1mA
TA = +25°C 0.8 1.1
TA = -40°C to +85°C 1.6
TA = -40°C to +125°C 2.0
Electrical Characteristics
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.
Absolute Maximum Ratings
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
Note 1: All parameters are tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: Delay measured from control edge to when output OUT_ changes by 1V.
(Typical Operating Circuit, VBB = 8V to 76V, VCC = 3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Rise Time OUT_ (20% to 80%) tRVBB = 60V, CL = 50pF, RL = 2.3kW0.9 2 µs
Fall Time OUT_ (80% to 20%) tFVBB = 60V, CL = 50pF, RL = 2.3kW0.6 1.5 µs
SERIAL INTERFACE TIMING CHARACTERISTICS
LOAD Rising to OUT_ Falling
Delay (Notes 2, 3) 0.9 1.8 µs
LOAD Rising to OUT_ Rising Delay (Notes 2, 3) 1.2 2.4 µs
BLANK Rising to OUT_ Falling
Delay (Notes 2, 3) 0.9 1.8 µs
BLANK Falling to OUT_ Rising
Delay (Notes 2, 3) 1.3 2.5 µs
Input Leakage Current
CLK, DIN, LOAD, BLANK IIH, IIL 0.05 10 µA
Logic-High Input Voltage
CLK, DIN, LOAD, BLANK VIH
0.8 x
VCC
V
Logic-Low Input Voltage
CLK, DIN, LOAD, BLANK VIL
0.3 x
VCC
V
Hysteresis Voltage
DIN, CLK, LOAD, BLANK DVI0.6 V
High-Voltage DOUT VOH ISOURCE = -1.0mA VCC –
0.5 V
Low-Voltage DOUT VOL ISINK = 1.0mA 0.5 V
Rise and Fall Time DOUT CDOUT = 10pF
(Note 2)
3V to 4.5V 60 100 ns
4.5V to 5.5V 30 80
CLK Clock Period tCP 200 ns
CLK Pulse-Width High tCH 90 ns
CLK Pulse-Width Low tCL 90 ns
CLK Rise to LOAD Rise Hold Time tCSH (Note 2) 100 ns
DIN Setup Time tDS 5 ns
DIN Hold Time tDH
3V to 4.5V 20 ns
4.5V to 5.5V 15
DOUT Propagation Delay tDO CDOUT = 10pF 3.0V to 4.5V 25 120 240 ns
4.5V to 5.5V 20 75 150
LOAD Pulse High tCSW 55 ns
Electrical Characteristics (continued)
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
(VCC = 5.0V, VBB = 76V, and TA = +25°C, unless otherwise noted.)
OUTPUT RISE AND
FALL WAVEFORM
MAX6920 toc11
1µs/div
BLANK
2V/div
OUT_
20V/div
OUTPUT VOLTAGE
vs. TEMPERATURE (OUTPUT LOW)
MAX6920 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1008040 600 20-20
2
4
6
8
10
12
14
0
-40 120
VBB = 40V
VBB = 8V
VBB = 76V
IOUT = 4mA
OUTPUT VOLTAGE (VBB - VH)
vs. TEMPERATURE (OUTPUT HIGH)
MAX6920 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1008040 600 20-20
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
-40 120
VBB = 76V
VBB = 40V
VBB = 8V
IOUT = -40mA
SUPPLY CURRENT (ICC)
vs. TEMPERATURE (OUTPUTS HIGH)
MAX6920 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (A)
6010
300
350
400
450
500
550
600
250
-40 110
VCC = 5V, CLK = 5MHz
VCC = 3.3V, CLK = 5MHz
VCC = 5V, CLK = IDLE
VCC = 3.3V, CLK = IDLE
LOGIC SUPPLY CURRENT (ICC)
vs. TEMPERATURE (OUTPUTS LOW)
MAX6920 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
1008040 600 20-20
50
100
150
200
250
300
350
400
0
-40 120
VCC = 5V, CLK = 5MHz
VCC = 3.3V, CLK = 5MHz
VCC = 5V, CLK = IDLE
VCC = 3.3V, CLK = IDLE
TUBE SUPPLY CURRENT (IBB)
vs. TEMPERATURE (OUTPUTS HIGH)
MAX6920 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1008040 600 20-20
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
-40 120
VBB = 76V
VBB = 40V VBB = 8V
TUBE SUPPLY CURRENT (IBB)
vs. TEMPERATURE (OUTPUTS LOW)
MAX6920 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
11060 8510 35-15
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
-40
VBB = 76V
VBB = 40V VBB = 8V
Typical Operating Characteristics
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
Figure 1. MAX6920 Functional Diagram
PIN NAME FUNCTION
1 VBB VFD Tube Supply Voltage
2 DOUT Serial-Clock Output. Data is clocked out of the internal shift register to DOUT on CLK’s rising edge.
3–8, 13–18 OUT0 to
OUT11 VFD Anode and Grid Drivers. OUT0 to OUT11 are push-pull outputs swinging from VBB to GND.
9 BLANK Blanking Input. High forces outputs OUT0 to OUT11 low, without altering the contents of the output
latches. Low enables outputs OUT0 to OUT11 to follow the state of the output latches.
10 GND Ground
11 CLK Serial-Clock Input. Data is loaded into the internal shift register on CLK’s rising edge.
12 LOAD Load Input. Data is loaded transparently from the internal shift register to the output latch while LOAD
is high. Data is latched into the output latch on LOAD’s rising edge, and retained while LOAD is low.
19 DIN Serial-Data Input. Data is loaded into the internal shift register on CLK’s rising edge.
20 VCC Logic Supply Voltage
SERIAL-TO-PARALLEL SHIFT REGISTER
LATCHES
CLK
DIN
LOAD
BLANK
OUT0 OUT1 OUT2 OUT11
DOUT
MAX6920
Pin Description
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
Detailed Description
The MAX6920 is a VFD tube driver comprising a
4-wire serial interface driving 12 high-voltage rail-to-rail
output ports. The driver is suitable for both static and
multiplexed displays.
The output ports feature high current-sourcing capabili-
ty to drive current into grids and anodes of static or
multiplex VFDs. The ports also have active current sink-
ing for fast discharge of capacitive display electrodes
in multiplexing applications.
The 4-wire serial interface comprises a 12-bit shift reg-
ister and a 12-bit transparent latch. The shift register is
written through a clock input CLK and a data input DIN
and the data propagates to a data output DOUT. The
data output allows multiple drivers to be cascaded and
operated together. The output latch is transparent to
the shift register outputs when LOAD is high, and latches
the current state on the falling edge of LOAD.
Each driver output is a slew-rated controlled CMOS push-
pull switch driving between VBB and GND. The output rise
time is always slower than the output fall time to avoid
shoot-through currents during output transitions. The
output slew rates are slow enough to minimize EMI, yet
are fast enough so as not to impact the typical 100µs digit
multiplex period and affect the display intensity.
Initial Power-Up and Operation
An internal reset circuit clears the internal registers of
the MAX6920 on power-up. All outputs OUT0 to OUT11
and the interface output DOUT initialize low regardless
of the initial logic levels of the CLK, DIN, BLANK, and
LOAD inputs.
4-Wire Serial Interface
The MAX6920 uses a 4-wire serial interface with three
inputs (DIN, CLK, LOAD) and a data output (DOUT).
This interface is used to write output data to the
MAX6920 (Figure 3) (Table 1). The serial interface data
word length is 12 bits, D0–D11.
The functions of the four serial interface pins are:
● CLK input is the interface clock, which shifts data into
the MAX6920’s 12-bit shift register on its rising edge.
● LOAD input passes data from the MAX6920’s 12-bit
shift register to the 12-bit output latch when LOAD
is high (transparent latch), and latches the data on
LOAD’s falling edge.
Figure 3. 4-Wire Serial Interface Timing Diagram
Figure 2. MAX6920 CMOS Output Driver Structure
LOAD
tCSW
tCP
tCSH
tCH
tDH
tDO
tDS
D11 D10 D1 D0
D11
tCL
CLK
DIN
DOUT
SLEW- RATE
CONTROL
VBB
OUT_
40Ω
TYPICAL
750Ω
TYPICAL
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
● DIN is the interface data input, and must be stable
when it is sampled on the rising edge of CLK.
● DOUT is the interface data output, which shifts data
out from the MAX6920’ 12-bit shift register on the fall-
ing edge of CLK. Data at DIN is propagated through
the shift register and appears at DOUT (20 CLK cycles
+ tDO) later.
A fifth input pin, BLANK, can be taken high to force out-
puts OUT0 to OUT11 low, without altering the contents of
the output latches. When the BLANK input is low, outputs
OUT0 to OUT11 follow the state of the output latches. A
common use of the BLANK input is PWM intensity control.
The BLANK input’s function is independent of the oper-
ation of the serial interface. Data can be shifted into the
serial interface shift register and latched regardless of the
state of BLANK.
Writing Device Registers Using the 4-Wire
Serial Interface
The MAX6920 is written using the following sequence:
1) Take CLK low.
2) Clock 12 bits of data in order D11 first to D0 last
into DIN, observing the data setup and hold times.
3) Load the 12 output latches with a falling edge
on LOAD.
LOAD may be high or low during a transmission. If
LOAD is high, then the data shifted into the shift regis-
ter at DIN appears at the OUT0 to OUT11 outputs.
CLK and DIN may be used to transmit data to other
peripherals. Activity on CLK always shifts data into the
MAX6920’s shift register. However, the MAX6920 only
updates its output latch on the rising edge of LOAD,
and the last 12 bits of data are loaded. Therefore, multi-
ple devices can share CLK and DIN as long as they
have unique LOAD controls.
Determining Driver Output Voltage Drop
The outputs are CMOS drivers, and have a resis-
tive characteristic. The typical and maximum sink and
source output resistances can be calculated from the
VH and VL electrical characteristics. Use this calculated
resistance to determine the output voltage drop at dif-
ferent output currents.
Output Current Ratings
The continuous current source capability is 40mA per
output. Outputs may drive up to 75mA as a repetitive
peak current, subject to the on time (output high) being
no longer than 1ms, and the duty cycle being such that
the output power dissipation is no more than the dissipa-
tion for the continuous case. The repetitive peak rating
allows outputs to drive a higher current in multiplex grid
driver applications, where only one grid is on at a time,
and the multiplex time per grid is no more than 1ms.
L = Low logic level.
H = High logic level.
X = Don’t care.
P = Present state (shift register).
R = Previous state (latched).
Table 1. 4-Wire Serial Interface Truth Table
SERIAL
DATA
INPUT
DIN
CLOCK
INPUT SHIFT REGISTER CONTENTS LOAD
INPUT LATCH CONTENTS BLANKING
INPUT OUTPUT CONTENTS
CLK D0 D1 D2 … Dn-1 Dn LOAD D0 D1 D2 … Dn-1 Dn BLANK D0 D1 D2 … Dn-1 Dn
H H R0 R1 … Rn-2 Rn-1
L L R0 R1 … Rn-2 Rn-1
X R0 R1 R2 … Rn-1 Rn
X X X … X X L R0 R1 R2 … Rn-1 Rn
P0 P1 P2 … Pn-1 Pn H P0 P1 P2 … Pn-1 Pn L P0 P1 P2 … Pn-1 Pn
X X X … X X H L L L … L L
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
Since dissipation is proportional to current squared, the
maximum current that can be delivered for a given mul-
tiplex ratio is given by:
IPEAK = (grids x 1600)1/2mA
where grids is the number of grids in a multiplexed display.
This means that a duplex application (two grids) can use
a repetitive peak current of 56.5mA, a triplex application
(three grids) can use a repetitive peak current of 69.2mA,
and higher multiplex ratios are limited to 75mA.
Paralleling Outputs
Any number of outputs within the same package may be
paralleled in order to raise the current drive or reduce the
output resistance. Only parallel outputs directly (by short-
ing outputs together) if the interface control can be guar-
anteed to set the outputs to the same level. Although the
sink output is relatively weak (typically 750W), that resis-
tance is low enough to dissipate 530mW when shorted to
an opposite level output at a VBB voltage of only 20V. A
safe way to parallel outputs is to use diodes to prevent the
outputs from sinking current (Figure 4). Because the out-
puts cannot sink current from the VFD tube, an external
discharge resistor, R, is required. For static tubes, R can
be a large value such as 100kW. For multiplexed tubes,
the value of the resistor can be determined by the load
capacitance and timing characteristics required. Resistor
Rl discharges tube capacitance C to 10% of the initial volt-
age in 2.3 x RC seconds. So, for example, a 15kW value
for R discharges 100pF tube grid or anode from 40V to
4V in 3.5µs, but draws an additional 2.7mA from the driver
when either output is high.
Power Dissipation
Take care to ensure that the maximum package dissi-
pation ratings for the chosen package are not exceed-
ed. Over dissipation is unlikely to be an issue when
driving static tubes, but the peak currents are usually
higher for multiplexed tubes. When using multiple dri-
ver devices, try to share the average dissipation evenly
between the drivers.
Determine the power dissipation (PD) for the MAX6920
for static tube drivers with the following equation:
PD = (VCC x ICC) + (VBB x IBB) + ((VBB - VH) x
IANODE x A))
where:
A = number of anodes driven (a MAX6920 can drive a
maximum of 12).
IANODE = maximum anode current.
(VBB - VH) is the output voltage drop at the given maxi-
mum anode current IOUT.
A static tube dissipation example follows:
VCC = 5V ±5%, VBB = 10V to 18V, A = 12, IOUT = 2mA
PD = (5.25V x 0.7mA) + (18V x 0.9mA) + ((2.5V x
2mA/25mA) x 2mA x 12) = 24.7mW
Determine the power dissipation (PD) for the MAX6920
for multiplex tube drivers with the following equation:
PD = (VCC x ICC) + (VBB x IBB) + ((VBB - VH) x IANODE
x A) + ((VBB - VH) x IGRID))
where:
A = number of anodes driven
G = number of grids driven
IANODE = maximum anode current
IGRID = maximum grid current
The calculation presumes all anodes are on but only
one grid is on. The calculated PD is the worst case,
presuming one digit is always being driven with all its
anodes lit. Actual PD can be estimated by multiplying
this PD figure by the actual tube drive duty cycle, taking
into account interdigit blanking and any PWM intensity
control.
A multiplexed tube dissipation example follows:
VCC = 5V ±5%, VBB = 36V to 42V, A = 6, G = 6,
IANODE = 0.4mA, IGRID = 24mA
PD = (5.25V x 0.7mA)+ (42V x 0.9mA) + ((2.5V x
0.4mA/25mA) x 0.4mA x 6) +
((2.5V x 24mA/25mA) x 24mA) = 99mW
Thus, for a 20-pin wide SO package (TJA = 1/0.01 =
+100°C/W from Absolute Maximum Ratings), the maxi-
mum allowed ambient temperature TA is given by:
TJ(MAX) = TA + (PD x TJA) = +150°C = TA + (0.099 x
+100°C/W)
So TA = +140°C.
Figure 4. Paralleling Outputs
MAX6920
OUT0
OUT1
D1
D2
R
OUTPUT
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
This means that the driver can be operated in this
application up to the MAX6920’s +125°C maximum
operating temperature.
Power-Supply Considerations
The MAX6920 operates with multiple power-supply volt-
ages. Bypass the VCC and VBB power-supply pins to
GND with a 0.1µF capacitor close to the device. For
multiplex applications, it may be necessary to add an
additional 1µF bulk electrolytic capacitor, or greater, to
the VBB supply.
Power-Supply Sequencing
The order of the power-supply sequencing is not import-
ant. The MAX6920 will not be damaged if either VCC
or VBB is grounded (or maintained at any other voltage
below the data sheet minimum), while the other supply
is maintained up to its maximum rating. However, as with
any CMOS device, do not drive the MAX6920’s logic
inputs if the logic supply VCC is not operational because
the input protection diodes clamp the signals.
PACKAGE
TYPE
PACKAGE
CODE
DOCUMENT
NO.
LAND
PATTERN NO.
20 SO W20-2 21-0042 90-0108
MAX6920
DIN
CLK
LOAD
BLANK
MAX685x
VFDOUT
VFCLK
VFLOAD
VFBLANK DOUT
VFD TUBE
MAX6920
DIN
CLK
LOAD
BLANK DOUT
MAX6920
DIN
CLK
LOAD
BLANK DOUT
Typical Application Circuit
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS
status.
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/03 Initial Release —
1 8/14 Removed automotive reference from data sheet 1
Revision History
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2014 Maxim Integrated Products, Inc.
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MAX6920 12-Output, 76V, Serial-Interfaced VFD Tube Driver
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
