19-3224; Rev 2; 3/07
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
General Description
The MAX6922/MAX6932/MAX6933/MAX6934 multi-out-
put, 76V, vacuum-fluorescent display (VFD) tube drivers
that interface a VFD tube to a microcontroller or a VFD
controller, such as the MAX6850–MAX6853. The
MAX6922/MAX6934 have 32 outputs, while the MAX6932
has 27 outputs, and the MAX6933 has 28 outputs. All
devices are also suitable for driving telecom relays.
Data is input using standard 4-wire serial interface
(CLOCK, DATA, LOAD, BLANK) compatible with other
VFD drivers and controllers.
For easy display control, the active-high BLANK input
forces all driver outputs low, turning the display off, and
automatically puts the IC into shutdown mode. Display
intensity may also be controlled by directly pulse-width
modulating the BLANK input.
The MAX6922/MAX6932/MAX6934 have a serial inter-
face data output, DOUT, allowing any number of
devices to be cascaded on the same serial interface.
The MAX6932/MAX6933/MAX6934 have a negative
supply voltage input, V
SS
, allowing the drivers’ output
swing to be made bipolar to simplify filament biasing in
many applications.
The MAX6922 is available in a 44-pin PLCC package,
the MAX6932 and MAX6933 are available in 36-pin
SSOP packages, and the MAX6934 is available in 44-pin
PLCC and TQFN packages.
Maxim also offers a 12-output VFD driver (MAX6920)
and 20-output VFD drivers (MAX6921/MAX6931).
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
5MHz Industry-Standard 4-Wire Serial Interface
3V to 5.5V Logic Supply Range
8V to 76V Grid/Anode Supply Range
-11V to 0V Filament Bias Supply
(MAX6932/MAX6933/MAX6934 Only)
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
-40°C to +125°C Temperature Range as Standard
MAX6922/MAX6932/MAX6933/MAX6934
Ordering Information
PART
MAX6922AQH
MAX6932AAX
MAX6933AAX
MAX6934AQH
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
Q44-1
A36-2
A36-2
Q44-1
T4477-3
-40°C to +125°C 44 PLCC
-40°C to +125°C 36 SSOP
-40°C to +125°C 36 SSOP
-40°C to +125°C 44 PLCC
MAX6934ATH -40°C to +125°C 44 TQFN-EP*
*EP
= Exposed paddle.
Typical Operating Circuit
Applications
White Goods
Gaming Machines
Automotive
Avionics
Instrumentation
Industrial Weighing
Security
Telecom
VFD Modules
Industrial Control
+5V
C1
100nF
38
V
CC
µC
VFDOUT
VFCLK
37
17
18
15
DIN
CLK
LOAD
BLANK
V
SS
-7V
C3
100nF
12
GND
16
32
OUT0–OUT31
VFD TUBE
39
V
BB
+60V
C2
100nF
MAX6934
Selector Guide
PART
MAX6922
MAX6932
MAX6933
MAX6934
NO. OF
OUTPUTS
32
27
28
32
BIPOLAR
OUTPUT
SWING
No
Yes
Yes
Yes
DOUT FOR
CASCADING
Yes
Yes
No
Yes
VFLOAD
VFBLANK
THIN QFN
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
MAX6922/MAX6932/MAX6933/MAX6934
ABSOLUTE MAXIMUM RATINGS
(Voltage with respect to GND.)
V
BB
.........................................................................-0.3V to +80V
V
CC
...........................................................................-0.3V to +6V
V
SS
(MAX6932/MAX6933/MAX6934 only)..............-12V to +0.3V
V
BB
- V
SS
(MAX6932/MAX6933/MAX6934 only) ....-0.3V to +80V
OUT_ (MAX6922 only) ..................(GND - -0.3V) to (V
BB
+ 0.3V)
OUT_ (MAX6932/MAX6933/MAX6934 only)
........................................................(V
SS
- -0.3V) to (V
BB
+ 0.3V)
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
OUT_ Continuous Source Current ....................................-45mA
OUT_ Pulsed (1ms max, 1/4 max duty) Source Current ...-80mA
Total OUT_ Continuous Source Current .........................-840mA
Total OUT_ Continuous Sink Current ...............................140mA
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 (T
A
= +70°C)
36-Pin SSOP (derate 11.8mW/°C
over +70°C)..................................................................941mW
44-Pin Thin QFN (derate 27mW/°C
over +70°C)................................................................2165mW
44-Pin PLCC (derate 13.3mW/°C
over +70°C)................................................................1067mW
Operating Temperature Range
(T
MIN
to T
MAX
) ...............................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
BB
= 8V to 76V, V
CC
= 3V to 5.5V, V
SS
= -11V to 0V, V
BB
- V
SS
≤
76V, T
A
= T
MIN
to T
MAX
, unless other-
wise noted.) (Note 1)
PARAMETER
Logic Supply Voltage
Tube Supply Voltage
Bias Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
Total Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
SYMBOL
V
CC
V
BB
V
SS
V
BB
- V
SS
All outputs OUT_ low, T
A
= +25°C
CLK = idle
T
A
= -40°C to +125°C
All outputs OUT_ high, T
A
= +25°C
CLK = idle
T
A
= -40°C to +125°C
All outputs OUT_ low
Tube Supply Operating Current
I
BB
All outputs OUT_ high
All outputs OUT_ low
I
SS
All outputs OUT_ high
V
BB
≥
15V,
I
OUT
= -25mA
High-Voltage OUT_
V
H
V
BB
≥
15V,
I
OUT
= -40mA
8V < V
BB
< 15V,
I
OUT
= -25mA
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
V
BB
- 2.5
V
BB
- 3.0
V
BB
- 2
V
BB
- 2.5
V
BB
- 3.5
V
BB
- 4.0
V
BB
- 1.2
V
-1
-1.2
-1.7
-1.8
V
BB
- 1.1
-1.5
-0.65
mA
1.3
81
813
2.0
CONDITIONS
MIN
3
8
-11
TYP
MAX
5.5
76
0
76
105
125
950
1000
2.5
3
1.75
2.0
mA
µA
UNITS
V
V
V
V
Logic Supply Operating Current
I
CC
Bias Supply Operating Current
(MAX6932/MAX6933/MAX6934
Only)
2
_______________________________________________________________________________________
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V
BB
= 8V to 76V, V
CC
= 3V to 5.5V, V
SS
= -11V to 0V, V
BB
- V
SS
≤
76V, T
A
= T
MIN
to T
MAX
, unless other-
wise noted.) (Note 1)
PARAMETER
SYMBOL
V
BB
≥
15V,
I
OUT
= 1mA
Low-Voltage OUT_
(MAX6932 Only)
V
L
8V < V
BB
< 15V,
I
OUT
= 1mA
V
BB
≥
15V,
I
OUT
= 1mA
V
L
8V < V
BB
< 15V,
I
OUT
= 1mA
t
R
t
F
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
0.9
0.6
0.8
MIN
TYP
0.75
MAX
1.2
1.5
2.1
1.3
1.7
2.2
V
SS
+ 0.75 V
SS
+ 1.2
V
SS
+ 1.5
V
SS
+ 2.1
V
SS
+ 0.8 V
SS
+ 1.3
V
SS
+ 1.7
V
SS
+ 2.2
2.5
1.5
µs
µs
V
V
UNITS
MAX6922/MAX6932/MAX6933/MAX6934
Low-Voltage OUT_
(MAX6932/MAX6933/MAX6934
Only)
Rise Time OUT_ (20% to 80%)
Fall Time OUT_ (80% to 20%)
LOAD Rising to OUT_ Falling
Delay
LOAD Rising to OUT_ Rising
Delay
BLANK Rising to OUT_ Falling
Delay
BLANK Falling to OUT_ Rising
Delay
Input Leakage Current
CLK, DIN, LOAD, BLANK
Logic-High Input Voltage
CLK, DIN, LOAD, BLANK
Logic-Low Input Voltage
CLK, DIN, LOAD, BLANK
Hysteresis Voltage
DIN, CLK, LOAD, BLANK
High-Voltage DOUT
Low-Voltage DOUT
V
BB
= 60V, C
L
= 50pF, R
L
=2.3kΩ
V
BB
= 60V, C
L
= 50pF, R
L
=2.3kΩ
SERIAL INTERFACE TIMING CHARACTERISTICS
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
I
IH
, I
IL
V
IH
V
IL
∆V
I
V
OH
V
OL
I
SOURCE
= -1.0mA
I
SINK
= 1.0mA
V
CC
-
0.5
0.5
0.6
0.8 x
V
CC
0.3 x
V
CC
0.9
1.2
0.9
1.3
0.05
3
3
3
3
10
µs
µs
µs
µs
µA
V
V
V
V
V
_______________________________________________________________________________________
3
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
MAX6922/MAX6932/MAX6933/MAX6934
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V
BB
= 8V to 76V, V
CC
= 3V to 5.5V, V
SS
= -11V to 0V, V
BB
- V
SS
≤
76V, T
A
= T
MIN
to T
MAX
, unless other-
wise noted.) (Note 1)
PARAMETER
Rise and Fall Time DOUT
CLK Clock Period
CLK Pulse-Width High
CLK Pulse-Width Low
CLK Rise to LOAD Rise Hold
DIN Setup Time
DIN Hold Time
DOUT Propagation Delay
LOAD Pulse High
t
CP
t
CH
t
CL
t
CSH
t
DS
t
DH
t
DO
t
CSW
3.0V to 4.5V
4.5V to 5.5V
C
DOUT
= 10pF
3.0V to 4.5V
4.5V to 5.5V
(Note 2)
SYMBOL
C
DOUT
= 10pF
(Note 2)
CONDITIONS
3V to 4.5V
4.5V to 5.5V
200
90
90
100
5
20
15
25
20
60
120
75
240
150
MIN
TYP
80
50
MAX
130
80
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1:
All parameters are tested at T
A
= +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 Characteristics
(V
CC
= 5.0V, V
BB
= 76V, and T
A
= +25°C, unless otherwise noted.)
TUBE SUPPLY CURRENT (I
BB
)
vs. TEMPERATURE (OUTPUTS LOW)
2.8
2.4
SUPPLY CURRENT (mA)
2.0
1.6
1.2
0.8
0.4
0
-40 -20
0
20
40
60
80
100 120
TEMPERATURE (
°
C)
V
BB
= 8V
V
BB
= 40V
V
BB
= 76V
MAX6922 toc01
TUBE SUPPLY CURRENT (I
BB
)
vs. TEMPERATURE (OUTPUTS HIGH)
MAX6922 toc02
LOGIC SUPPLY CURRENT (I
CC
)
vs. TEMPERATURE (OUTPUTS LOW)
0.9
0.8
SUPPLY CURRENT (mA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
CC
= 3.3V, CLK = IDLE
V
CC
= 5V, CLK = IDLE
V
CC
= 3.3V, CLK = 5MHz
V
CC
= 5V, CLK = 5MHz
MAX6922 toc03
2.0
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-40 -20
0
20
40
60
80
100 120
TEMPERATURE (
°
C)
V
BB
= 8V
V
BB
= 40V
V
BB
= 76V
1.0
-40 -20
0
80
°
C)
TEMPERATURE (
20
40
60
100 120
4
_______________________________________________________________________________________
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
MAX6922/MAX6932/MAX6933/MAX6934
Typical Operating Characteristics (continued)
(V
CC
= 5.0V, V
BB
= 76V, and T
A
= +25°C, unless otherwise noted.)
LOGIC SUPPLY CURRENT (I
CC
)
vs. TEMPERATURE (OUTPUTS HIGH)
MAX6922 toc04
OUTPUT VOLTAGE
vs. TEMPERATURE (OUTPUTS LOW)
MAX6922 toc05
OUTPUT VOLTAGE (V
BB
- V
T
)
vs. TEMPERATURE (OUTPUTS HIGH)
I
OUT
= -40mA
V
BB
= 40V
MAX6922 toc06
1.2
1.1
SUPPLY CURRENT (mA)
1.0
V
CC
= 3.3V, CLK = 5MHz
0.9
0.8
0.7
0.6
V
CC
= 3.3V, CLK = IDLE
-40 -20
0
20
40
60
80
100 120
TEMPERATURE (
°
C)
16
14
OUTPUT VOLTAGE (V)
12
10
8
6
4
2
0
I
OUT
= 4mA
V
BB
= 76V
3.5
3.0
OUTPUT VOLTAGE (V)
2.5
2.0
1.5
V
CC
= 5V, CLK = 5MHz
V
BB
= 40V
V
BB
= 76V
V
BB
= 8V
V
BB
= 8V
1.0
0.5
0
V
CC
= 5V, CLK = IDLE
-40 -20
0
20
40
60
80
100 120
-40 -20
0
TEMPERATURE (
°
C)
80
°
C)
TEMPERATURE (
20
40
60
100 120
OUTPUT FALL AND RISE TIME
MAX6922 toc07
BLANK
2V/div
OUT
20V/div
1µs/div
_______________________________________________________________________________________
5
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