ers 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 sup-
ply 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).
●
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
Ordering Information
PART
MAX6922AQH
MAX6932AAX
MAX6933AAX
MAX6934AQH
MAX6934ATH
*EP = Exposed pad.
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
44 PLCC
36 SSOP
36 SSOP
44 PLCC
44 TQFN-EP*
Applications
●
●
●
●
●
White Goods
Gaming Machines
Avionics
Instrumentation
Industrial Weighing
●
●
●
●
Security
Telecom
VFD Modules
Industrial Control
Typical Operating Circuit
+5V
C1
100nF
38
V
CC
µC
VFDOUT
VFCLK
VFLOAD
VFBLANK
37
17
18
15
DIN
CLK
LOAD
BLANK
V
SS
-7V
C3
100nF
12
GND
16
39
V
BB
+60V
C2
100nF
MAX6934
OUT0–OUT31
32
VFD TUBE
Selector Guide
BIPOLAR
DOUT FOR
PART
OUTPUT
CASCADING
SWING
MAX6922
32
No
Yes
MAX6932
27
Yes
Yes
MAX6933
28
Yes
No
MAX6934
32
Yes
Yes
Pin Configurations appear at end of data sheet.
NO. OF
OUTPUTS
THIN QFN
19-3224; Rev 3; 7/14
MAX6922/MAX6932/
MAX6933/MAX6934
Absolute Maximum Ratings
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
(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
- VSS (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
PARAMETER
Logic Supply Voltage
Tube Supply Voltage
Bias Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
Total Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
(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)
SYMBOL
V
CC
V
BB
V
SS
V
BB
- V
SS
All outputs OUT_ low,
CLK = idle
T
A
= +25°C
81
813
2.0
1.3
-1
-1.2
-1.7
-1.8
V
BB
- 2
V
BB
- 1.1
-1.5
-0.65
mA
T
A
= -40°C to +125°C
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
All outputs OUT_ high, T
A
= +25°C
CLK = idle
T
A
= -40°C to +125°C
All outputs OUT_ low
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
T
A
= +25°C
Tube Supply Operating Current
I
BB
All outputs OUT_ high
All outputs OUT_ low
Bias Supply Operating Current
(MAX6932/MAX6933/MAX6934
Only)
I
SS
All outputs OUT_ high
V
BB
≥ 15V,
I
OUT
= -25mA
T
A
= -40°C to +125°C
T
A
= -40°C to +125°C
V
BB
- 2.5
V
BB
- 3.5
V
BB
- 4.0
V
BB
- 1.2
V
High-Voltage OUT_
V
H
V
BB
≥ 15V,
I
OUT
= -40mA
8V < V
BB
< 15V,
I
OUT
= -25mA
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
V
BB
- 2.5
V
BB
- 3.0
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Maxim Integrated
│
2
MAX6922/MAX6932/
MAX6933/MAX6934
Electrical Characteristics (continued)
PARAMETER
SYMBOL
V
BB
≥ 15V,
I
OUT
= 1mA
V
L
8V < V
BB
< 15V,
I
OUT
= 1mA
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
(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)
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
8V < V
BB
< 15V,
I
OUT
= 1mA
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
I
IH
, I
IL
V
IH
V
IL
DV
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
t
R
t
F
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
V
BB
= 60V, C
L
= 50pF, R
L
= 2.3kW
V
BB
= 60V, C
L
= 50pF, R
L
= 2.3kW
0.9
0.6
V
SS
+
0.8
V
SS
+ 0.75
0.8
MIN
TYP
0.75
MAX
1.2
1.5
2.1
1.3
1.7
2.2
V
SS
+
1.2
V
SS
+ 1.5
V
SS
+ 2.1
V
SS
+
1.3
V
SS
+ 1.7
V
SS
+ 2.2
2.5
1.5
µs
µs
V
V
UNITS
Low-Voltage OUT_
(MAX6932 Only)
V
BB
≥ 15V,
I
OUT
= 1mA
Low-Voltage OUT_
(MAX6932/MAX6933/MAX6934
Only)
V
L
SERIAL INTERFACE TIMING CHARACTERISTICS
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
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
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Maxim Integrated
│
3
MAX6922/MAX6932/
MAX6933/MAX6934
Electrical Characteristics (continued)
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
(Note 2)
SYMBOL
C
DOUT
= 10pF
(Note 2)
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
(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)
CONDITIONS
3V to 4.5V
4.5V to 5.5V
200
90
90
100
5
20
15
3.0V to 4.5V
4.5V to 5.5V
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.
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