MAX6932AAX [MAXIM]
27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers;
| 型号： | MAX6932AAX |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers |
| 文件： | 总14页 (文件大小：1029K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
General Description
Features
The MAX6922/MAX6932/MAX6933/MAX6934 multi-out-
put, 76V, vacuum-fluorescent display (VFD) tube driv-
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.
● 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
Data is input using standard 4-wire serial interface
(CLOCK, DATA, LOAD, BLANK) compatible with other
VFD drivers and controllers.
● Outputs can Source 40mA, Sink 4mA Continuously
● Outputs can Source 75mA Repetitive Pulses
● 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
automatically puts the IC into shutdown mode. Display
intensity may also be controlled by directly pulse-width
modulating the BLANK input.
● 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
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.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
The MAX6932/MAX6933/MAX6934 have a negative sup-
ply voltage input, V , allowing the drivers’ output swing
to be made bipolar to simplify filament biasing in many
applications.
SS
MAX6922AQH
MAX6932AAX
MAX6933AAX
MAX6934AQH
MAX6934ATH
-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
-40°C to +125°C 44 TQFN-EP*
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.
*EP = Exposed pad.
Maxim also offers a 12-output VFD driver (MAX6920) and
20-output VFD drivers (MAX6921/MAX6931).
Typical Operating Circuit
Applications
+5V
+60V
● White Goods
● Gaming Machines
● Avionics
● Instrumentation
● Industrial Weighing
● Security
● Telecom
● VFD Modules
● Industrial Control
C2
100nF
C1
100nF
38
V
39
V
CC
BB
µC
MAX6934
37
17
18
15
32
VFDOUT
DIN
Selector Guide
OUT0–OUT31
VFCLK
VFLOAD
VFBLANK
CLK
LOAD
BIPOLAR
OUTPUT
SWING
NO. OF
DOUT FOR
CASCADING
PART
OUTPUTS
BLANK
V
GND
16
SS
MAX6922
MAX6932
MAX6933
MAX6934
32
27
28
32
No
Yes
Yes
Yes
Yes
Yes
No
12
-7V
C3
100nF
THIN QFN
Yes
Pin Configurations appear at end of data sheet.
19-3224; Rev 3; 7/14
MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Absolute Maximum Ratings
(Voltage with respect to GND.)
OUT_ Sink Current ............................................................15mA
CLK, DIN, LOAD, BLANK, DOUT Current ......................±10mA
V
V
V
V
........................................................................-0.3V to +80V
..........................................................................-0.3V to +6V
(MAX6932/MAX6933/MAX6934 only) ...........-12V to +0.3V
BB
CC
SS
BB
Continuous Power Dissipation (T = +70°C)
A
36-Pin SSOP (derate 11.8mW/°C
over +70°C) .................................................................941mW
44-Pin Thin QFN (derate 27mW/°C
- V
SS
(MAX6932/MAX6933/MAX6934 only) ...-0.3V to +80V
OUT_ (MAX6922 only)................(GND - -0.3V) to (V + 0.3V)
BB
OUT_ (MAX6932/MAX6933/MAX6934 only)
over +70°C) ...............................................................2165mW
44-Pin PLCC (derate 13.3mW/°C
......................................................(V - -0.3V) to (V + 0.3V)
SS
BB
All Other Pins ........................................... -0.3V to (V
+ 0.3V)
over +70°C) ...............................................................1067mW
Operating Temperature Range
CC
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)
(T
to T
)............................................. -40°C to +125°C
MIN
MAX
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Source Current ...........................................................-960mA
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-
MAX
BB
CC
SS
BB
SS
A
MIN
wise noted.) (Note 1)
PARAMETER
Logic Supply Voltage
Tube Supply Voltage
SYMBOL
CONDITIONS
MIN
3
TYP
MAX
5.5
UNITS
V
V
V
CC
V
8
76
0
BB
SS
Bias Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
V
-11
V
V
Total Supply Voltage (MAX6932/
MAX6933/MAX6934 Only)
V
- V
76
BB
SS
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
= +25°C
81
813
2.0
105
125
950
1000
2.5
All outputs OUT_ low,
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
CLK = idle
= -40°C to +125°C
= +25°C
Logic Supply Operating Current
Tube Supply Operating Current
I
µA
mA
mA
CC
All outputs OUT_ high,
CLK = idle
= -40°C to +125°C
= +25°C
All outputs OUT_ low
All outputs OUT_ high
All outputs OUT_ low
All outputs OUT_ high
= -40°C to +125°C
= +25°C
3
I
I
BB
SS
1.3
1.75
2.0
= -40°C to +125°C
= +25°C
-1
-0.65
-1.5
Bias Supply Operating Current
(MAX6932/MAX6933/MAX6934
Only)
= -40°C to +125°C
= +25°C
-1.2
-1.7
-1.8
= -40°C to +125°C
= +25°C
V
- 1.1
BB
V
OUT
≥ 15V,
BB
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= +25°C
V
- 2
BB
BB
BB
BB
I
= -25mA
V
V
V
- 2.5
- 3.5
- 4.0
V
OUT
≥ 15V,
BB
High-Voltage OUT_
V
V
H
I
= -40mA
V
- 1.2
BB
8V < V < 15V,
BB
= -25mA
= -40°C to +85°C
= -40°C to +125°C
V
V
- 2.5
- 3.0
BB
I
OUT
BB
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Electrical Characteristics (continued)
(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-
MAX
BB
CC
SS
BB
SS
A
MIN
wise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
1.2
UNITS
T
T
T
T
T
T
= +25°C
0.75
A
A
A
A
A
A
V
OUT
≥ 15V,
BB
= -40°C to +85°C
= -40°C to +125°C
= +25°C
1.5
2.1
1.3
1.7
2.2
I
= 1mA
Low-Voltage OUT_
(MAX6932 Only)
V
V
L
0.8
8V < V < 15V,
BB
= 1mA
= -40°C to +85°C
= -40°C to +125°C
I
OUT
V
V
SS
1.2
+
SS
T
= +25°C
A
+ 0.75
V
OUT
≥ 15V,
BB
I
= 1mA
T
T
= -40°C to +85°C
= -40°C to +125°C
V
V
+ 1.5
+ 2.1
A
A
SS
SS
V
Low-Voltage OUT_
(MAX6932/MAX6933/MAX6934
Only)
V
V
L
V
+
+
SS
1.3
SS
T
= +25°C
A
0.8
8V < V < 15V,
OUT
BB
I
= 1mA
T
T
= -40°C to +85°C
= -40°C to +125°C
V
V
+ 1.7
+ 2.2
2.5
A
SS
A
SS
Rise Time OUT_ (20% to 80%)
Fall Time OUT_ (80% to 20%)
t
V
V
= 60V, C = 50pF, R = 2.3kW
0.9
0.6
µs
µs
R
BB
L
L
t
= 60V, C = 50pF, R = 2.3kW
1.5
F
BB
L
L
SERIAL INTERFACE TIMING CHARACTERISTICS
LOAD Rising to OUT_ Falling
(Notes 2, 3)
0.9
1.2
0.9
1.3
3
3
µs
µs
µs
µs
µA
V
Delay
LOAD Rising to OUT_ Rising
Delay
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
BLANK Rising to OUT_ Falling
Delay
3
BLANK Falling to OUT_ Rising
Delay
3
Input Leakage Current
CLK, DIN, LOAD, BLANK
I
, I
0.05
10
IH IL
Logic-High Input Voltage
CLK, DIN, LOAD, BLANK
0.8 x
CC
V
IH
V
Logic-Low Input Voltage
CLK, DIN, LOAD, BLANK
0.3 x
CC
V
V
IL
V
Hysteresis Voltage
DIN, CLK, LOAD, BLANK
DV
0.6
V
I
V
-
CC
High-Voltage DOUT
Low-Voltage DOUT
V
I
I
= -1.0mA
SOURCE
V
V
OH
0.5
V
= 1.0mA
SINK
0.5
OL
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Electrical Characteristics (continued)
(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-
MAX
BB
CC
SS
BB
SS
A
MIN
wise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
3V to 4.5V
= 10pF
MIN
TYP
80
MAX
130
UNITS
C
DOUT
Rise and Fall Time DOUT
ns
(Note 2)
4.5V to 5.5V
50
80
CLK Clock Period
t
200
90
90
100
5
ns
ns
ns
ns
ns
CP
CLK Pulse-Width High
CLK Pulse-Width Low
CLK Rise to LOAD Rise Hold
DIN Setup Time
t
CH
t
CL
t
(Note 2)
CSH
t
DS
3.0V to 4.5V
4.5V to 5.5V
20
15
25
20
60
DIN Hold Time
t
ns
DH
3.0V to 4.5V
4.5V to 5.5V
120
75
240
150
DOUT Propagation Delay
LOAD Pulse High
t
C
= 10pF
ns
ns
DO
DOUT
t
CSW
Note 1: All parameters are tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: Guaranteed by design.
Note 3: Delay measured from control edge to when output OUT_ changes by 1V.
Typical Operating Characteristics
(V
= 5.0V, V = 76V, and T = +25°C, unless otherwise noted.)
BB A
CC
TUBE SUPPLY CURRENT (I
)
BB
TUBE SUPPLY CURRENT (I
)
BB
LOGIC SUPPLY CURRENT (I
)
CC
vs. TEMPERATURE (OUTPUTS LOW)
vs. TEMPERATURE (OUTPUTS HIGH)
vs. TEMPERATURE (OUTPUTS LOW)
2.0
1.0
V
BB
= 76V
2.8
2.4
V
= 5V, CLK = 5MHz
CC
V
BB
= 76V
1.8
1.6
0.9
0.8
V
= 3.3V, CLK = 5MHz
CC
1.4
1.2
0.7
0.6
V
BB
= 40V
2.0
1.6
1.2
0.8
V
= 8V
BB
V
BB
= 40V
1.0
0.8
0.6
0.5
0.4
0.3
V
= 8V
BB
V
CC
= 3.3V, CLK = IDLE
V
= 5V, CLK = IDLE
0.4
0.2
0
0.2
0.1
0
CC
0.4
0
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Typical Operating Characteristics (continued)
(V
= 5.0V, V = 76V, and T = +25°C, unless otherwise noted.)
BB A
CC
LOGIC SUPPLY CURRENT (I
)
CC
OUTPUT VOLTAGE
OUTPUT VOLTAGE (V - V )
BB T
vs. TEMPERATURE (OUTPUTS HIGH)
vs. TEMPERATURE (OUTPUTS LOW)
vs. TEMPERATURE (OUTPUTS HIGH)
1.2
1.1
1.0
0.9
0.8
0.7
16
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 76V
I
= 4mA
I
= -40mA
OUT
BB
OUT
V
BB
= 40V
14
12
10
8
V
= 5V, CLK = 5MHz
CC
V
BB
= 40V
V
= 76V
BB
V
= 3.3V, CLK = 5MHz
= 5V, CLK = IDLE
CC
V
= 8V
6
BB
V
= 8V
BB
V
CC
4
2
V
= 3.3V, CLK = IDLE
CC
0.6
0
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
OUTPUT FALL AND RISE TIME
MAX6922 toc07
BLANK
2V/div
OUT
20V/div
1µs/div
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Pin Description
PIN
MAX6922/
MAX6934
PLCC
MAX6932/
MAX6933
SSOP
NAME
FUNCTION
MAX6934
TQFN
1
2
1
2
39
40
V
VFD Supply Voltage
Serial-Data Output. Data is clocked out of the internal shift register to DOUT
BB
DOUT
(MAX6932) on CLK’s falling edge. For the MAX6933 only—VFD anode and grid driver.
(OUT27)
(MAX6933)
2
(OUT27 is a push-pull output swinging from V to V .)
BB SS
3, 4, 5, 7–
17, 19, 20,
25, 26, 27,
30–42
1–11, 13,
14, 19, 20,
21, 24–36,
41, 42, 43
OUT0 to VFD Anode and Grid Drivers. OUT_ are push-pull outputs swinging from
OUT31 to GND for the MAX6922 and from V to V for the MAX6934.
—
V
BB
BB
SS
3 –13, 15,
16, 21–34
OUT0 to VFD Anode and Grid Drivers. OUT_ are push-pull outputs swinging from
—
6, 28, 29
18
—
22, 23, 44
—
OUT26
V
to V
.
BB
SS
—
—
14
N.C.
No Connection. Not internally connected.
For the MAX6922—No Connection. Not internally connected. For the
MAX6934—bias supply voltage.
N.C. (V
)
SS
—
12
V
Bias Supply Voltage
SS
Blanking Input. High forces outputs OUT_ low without altering the contents
of the output latches. Low enables outputs OUT_ to follow the state of the
output latches.
21
17
15
BLANK
22
23
18
19
16
17
GND
CLK
Ground
Serial-Clock Input. Data is loaded into the internal shift register on CLK’s
rising edge. On CLK’s falling edge, data is clocked out of DOUT.
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.
24
20
18
LOAD
DIN
Serial-Data Input. Data is loaded into the internal shift register on CLK’s
rising edge.
43
44
—
35
36
—
37
38
EP
V
Logic Supply Voltage
CC
Exposed Pad. Connect to a large ground plane to maximize thermal
performance.
EP
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
CLK
DIN
MAX6922/MAX6932/
MAX6934 ONLY
SERIAL-TO-PARALLEL SHIFT REGISTER
DOUT
LATCHES
LOAD
BLANK
MAX6922
MAX6932
MAX6933
MAX6934
WHERE n =
27 FOR MAX6932
28 FOR MAX6933
32 FOR MAX6922/MAX6934
OUT0 OUT1 OUT2
OUTn
Figure 1. MAX6922/MAX6932/MAX6933/MAX6934 Functional Diagram
V
BB
V
BB
40W
TYPICAL
40Ω
TYPICAL
SLEW-RATE
CONTROL
SLEW-RATE
CONTROL
OUT_
OUT_
750W
TYPICAL
750Ω
TYPICAL
V
SS
Figure 2. MAX6922 CMOS Output Driver Structure
Figure 3. MAX6932/MAX6933/MAX6934 CMOS Output Driver
Structure
The 4-wire serial interface comprises a shift register and
transparent latch with 32 bits for the MAX6922/MAX6934,
28 bits for the MAX6933, and 27 bits for the MAX6932.
The shift register is written through a clock input CLK and
a data input DIN. For the MAX6922/MAX6932/MAX6934,
the data propagates to a data output DOUT. The data out-
put allows multiple drivers to be cascaded and operated
together. The output latch is transparent to the shift reg-
ister outputs when LOAD is high, and latches the current
state on the falling edge of LOAD.
Detailed Description
The MAX6922/MAX6932/MAX6933/MAX6934 are VFD
tube drivers comprising a 4-wire serial interface driving
high-voltage rail-to-rail output ports. The driver is suitable
for both static and multiplexed displays.
The output ports feature high current-sourcing capability
to drive current into grids and anodes of static or multiplex
VFDs. The ports also have active current sinking for fast
discharge of capacitive display electrodes in multiplexing
applications.
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Each driver output is a slew-rate controlled CMOS push-
● DOUT is the interface data output, which shifts data
out from the shift register on the rising edge of CLK.
Data at DIN is propagated through the shift register
pull switch driving between V
and GND (MAX6922)
BB
or V
and V
(MAX6932/MAX6933/ MAX6934). The
BB
SS
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.
and appears at DOUT (n CLK cycles + t ) later,
where n is the number of drivers in the IC.
DO
A fifth input, BLANK, can be taken high to force the out-
puts low, without altering the contents of the output latch-
es. When the BLANK input is low, the outputs follow the
state of the output latches. A common use of the BLANK
input is PWM intensity control.
Initial Power-Up and Operation
An internal reset circuit clears the internal registers on
power-up. All outputs and the interface output DOUT
(MAX6922/MAX6932/MAX6934 only) initialize low regard-
less of the initial logic levels of the CLK, DIN, BLANK, and
LOAD inputs.
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 MAX6922/MAX6932/MAX6933/MAX6934 are nor-
mally written using the following sequence:
4-Wire Serial Interface
These driver ICs use a 4-wire serial interface with three
inputs (DIN, CLK, LOAD) and a data output (DOUT,
MAX6922/MAX6932/MAX6934 only). This interface is
used to write data to the ICs (Figure 4) (Table 1). The seri-
al interface data word length is 32 bits for the MAX6922/
MAX6934, 27 bits for the MAX6932, and 28 bits for the
MAX6933.
1) Take CLK low.
2) Clock n bits of data in order D
first to D0 last into
n-1
DIN, observing the data setup and hold times.
3) Load the n output latches with a falling edge on
LOAD, where n is 27 for the MAX6932, 28 for the
MAX6933, and 32 for the MAX6922 and MAX6934.
The functions of the four serial interface pins are:
● CLK input is the interface clock, which shifts data into
the shift register on its rising edge.
LOAD may be high or low during a transmission. If LOAD
is high, then the data shifted into the shift register at
● LOAD input passes data from the shift register to the
output latch when LOAD is high (transparent latch),
and latches the data on LOAD’s falling edge.
DIN appears at the OUT0 to OUT
outputs.
n-1
CLK and DIN may be used to transmit data to other
peripherals. Activity on CLK always shifts data into the
shift register. However, the output latches only update
on the rising edge of LOAD, and the last n bits of data
● DIN is the interface data input, and must be stable
when it is sampled on the rising edge of CLK.
t
CSW
LOAD
t
CSH
t
CL
t
CH
t
CP
CLK
DIN
t
DH
t
DS
Dn-1
Dn-2
D1
D0
t
DO
DOUT
Dn-1
Figure 4. 4-Wire Serial Interface Timing Diagram
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Table 1. 4-Wire Serial Interface Truth Table
LOAD
CLOCK
INPUT
BLANKING
SERIAL
DATA
INPUT
DIN
SHIFT REGISTER CONTENTS
LATCH CONTENTS
OUTPUT CONTENTS
INPUT
INPUT
CLK D0 D1 D2
…
Dn-2 Dn-1 LOAD D0 D1 D2 … Dn-2 Dn-1 BLANK D0 D1 D2 … Dn-2 Dn-1
H
L
H
L
R0 R1
R0 R1
…
…
…
…
…
Rn-2 Rn-1
Rn-2 Rn-1
Rn-1 Rn
X
R0 R1 R2
X
X
X
X
X
L
R0 R1 R2 … Rn-1 Rn
P0 P1 P2 … Pn-1 Pn
P0 P1 P2
Pn-1
Pn
H
L
P0 P1 P2
…
…
Pn-1 Pn
X
X
X
…
X
X
H
L
L
L
L
L
L = Low logic level.
H = High logic level.
X = Don’t care.
P = Present state (shift register).
R = Previous state (latched).
clocked in are loaded. Therefore, multiple devices can
share CLK and DIN, as long as they have unique LOAD
controls.
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
shorting outputs together) if the interface control can be
guaranteed to set the outputs to the same level. Although
the sink output is relatively weak (typically 750W), that
resistance is low enough to dissipate 530mW when short-
Determining Driver Output Voltage Drop
The outputs are CMOS drivers, and have a resistive
characteristic. The typical and maximum sink and source
output resistances can be calculated from the V and V
H
L
electrical characteristics. Use this calculated resistance
to determine the output voltage drop at different output
currents.
ed to an opposite level output at a V
voltage of only
BB
20V. A safe way to parallel outputs is to use diodes to pre-
vent the outputs from sinking current (Figure 5). Because
the diodes also stop the outputs from sinking 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
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 dissipation
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.
MAX6922
MAX6932
MAX6933
MAX6934
D1
Since dissipation is proportional to current squared, the
maximum current that can be delivered for a given multi-
plex ratio is given by:
OUT0
OUT1
OUTPUT
D2
1/2
I
= (grids x 1600)
mA
PEAK
R
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 (three grids)
application can use a repetitive peak current of 69.2mA,
and higher multiplex ratios are limited to 75mA.
Figure 5. Paralleling Outputs
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
characteristics required. Resistor R discharges tube
capacitance C to 10% of the initial voltage 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.
A multiplexed tube dissipation example follows:
V
CC
= 5V ±5%, V = 36V to 42V, A = 20, G = 12,
BB
I
= 0.4mA, I
= 24mA
ANODE
GRID
P
D
= (5.25V x 1.5mA)+ (42V x 2.2mA) +
((2.5V x 0.4mA/25mA) x 0.4mA x 20) +
((2.5V x 24mA/25mA) x 24mA) = 158mW
Power Dissipation
Thus, for a 44-pin PLCC package (T
= 1/0.0133 =
JA
Take care to ensure that the maximum package dissipa-
tion ratings for the chosen package are not exceeded.
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 driver devices,
try to share the average dissipation evenly between the
drivers.
75.188°C/W from Absolute Maximum Ratings), the maxi-
mum allowed ambient temperature T is given by:
A
T
= T + (P x T ) = +150°C = T + (0.158 x
A D JA A
J(MAX)
75.188°C/W)
So T = +138°C.
A
This means that the driver can be operated in this
application with a PLCC package up to the +125°C
maximum operating temperature.
Determine the power dissipation (P ) for the MAX6922/
D
MAX6932/MAX6933/MAX6934 for static tube drivers with
the following equation:
Power-Supply Considerations
The MAX6922/MAX6932/MAX6933/MAX6934 operate
with multiple power-supply voltages. Bypass the V
P
= (V x I ) + (V x I ) + ((V - V ) x
CC CC BB BB BB H
D
I
x A))
ANODE
,
CC
where:
V
, and V (MAX6932/MAX6933/MAX6934 only) pow-
BB
SS
er-supply pins to GND with 0.1µF capacitors close to the
device. The MAX6932/MAX6933/MAX6934 may be oper-
A = number of anodes driven (maximum of 32 with the
MAX6922/MAX6934).
ated with V tied to GND if a negative bias supply is not
required. For multiplex applications, it may be necessary
to add an additional bulk electrolytic capacitor of 1µF or
SS
I
= maximum anode current.
ANODE
(V - V ) is the output voltage drop at the given maxi-
mum anode current I
BB
H
.
OUT
greater to the V supply.
BB
A static tube dissipation example follows:
= 5V ±5%, V = 10V to 18V, A = 32, I = 2mA
OUT
Power-Supply Sequencing
The order of the power-supply sequencing is not import-
ant. These ICs are damaged if any combination of V
V
CC
BB
P
D
= (5.25V x 1.5mA)+ (18V x 2.2mA) +
,
CC
((2.5V x 2mA/25mA) x 2mA x 32) = 60mW
V
, and V
is grounded while the other supply or
BB
SS
supplies are maintained up to their maximum ratings.
However, as with any CMOS device, do not drive the logic
Determine the power dissipation (PD) for the MAX6922/
MAX6932/MAX6933/MAX6934 for multiplex tube drivers
with the following equation:
inputs if the logic supply V
is not operational because
CC
the input protection diodes clamp the signals.
P
D
= (V x I ) + (V x I ) + ((V - V ) x
CC CC BB BB BB H
I
x A) + ((V - V ) x I
))
GRID
ANODE
BB
H
Cascading Drivers
(MAX6922/MAX6932/MAX6934 Only)
where:
Multiple driver ICs may be cascaded, as shown in the
Typical Application Circuit, by connecting each driver’°s
DOUT to DIN of the next drivers. Devices may be cas-
A = number of anodes driven.
G = number of grids driven.
I
I
= maximum anode current.
caded at the full 5MHz CLK speed when V
≥ 4.5V.
ANODE
CC
When V
<4.5V, the longer propagation delay (t
)
CC
DO
= maximum grid current.
GRID
limits the maximum cascaded CLK to 4MHz.
The calculation presumes all anodes are on, but only one
grid is on. The calculated P is the worst case, presum-
D
ing one digit is always being driven with all its anodes lit.
Actual P can be estimated by multiplying this P figure
D
D
by the actual tube drive duty cycle, taking into account
interdigit blanking and any PWM intensity control.
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Typical Application Circuit
MAX685x
MAX6922
VFDOUT
DIN
VFCLK
CLK
VFLOAD
LOAD
VFBLANK
BLANK
DOUT
DOUT
DOUT
MAX6922
DIN
CLK
LOAD
BLANK
MAX6922
DIN
CLK
LOAD
BLANK
Chip Information
PROCESS: BiCMOS
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Pin Configurations
TOP VIEW
43
43
42 41 40
6
5
4
3
2
1
44
42 41 40
6
5
4
3
2
1
44
OUT28
OUT27
OUT26
7
8
9
39 OUT3
38 OUT4
37 OUT5
36 OUT6
35 OUT7
34 OUT8
33 OUT9
32 OUT10
31 OUT11
30 OUT12
29 N.C.
OUT28
OUT27
OUT26
7
8
9
39 OUT3
38 OUT4
37 OUT5
36 OUT6
35 OUT7
34 OUT8
33 OUT9
32 OUT10
31 OUT11
30 OUT12
29 N.C.
OUT25 10
OUT24 11
OUT23 12
OUT22 13
OUT21 14
OUT20 15
OUT19 16
OUT18 17
OUT25 10
OUT24 11
OUT23 12
OUT22 13
OUT21 14
OUT20 15
OUT19 16
OUT18 17
MAX6922
MAX6934
18 19 20 21 22 23 24 25 26 27 28
18 19 20 21 22 23 24 25 26 27 28
PLCC
PLCC
V
1
2
3
4
5
6
7
8
9
36 V
CC
BB
DOUT(OUT27)
OUT26
35 DIN
34 OUT0
33 OUT1
32 OUT2
31 OUT3
30 OUT4
29 OUT5
28 OUT6
27 OUT7
26 OUT8
25 OUT9
24 OUT10
23 OUT11
22 OUT12
21 OUT13
20 LOAD
19 CLK
OUT28
OUT27
OUT26
OUT25
OUT24
OUT23
OUT22
OUT21
OUT20
OUT19
1
2
33 OUT3
OUT25
32
31
OUT4
OUT5
OUT24
OUT23
3
MAX6932
MAX6933
OUT22
4
30 OUT6
29 OUT7
OUT21
5
OUT20
MAX6934
6
28
OUT8
OUT19 10
OUT18 11
OUT17 12
OUT16 13
7
27 OUT9
26 OUT10
25 OUT11
8
9
V
14
SS
10
24
OUT12
OUT15 15
OUT14 16
BLANK 17
GND 18
EP
OUT18 11
23 N.C.
THIN QFN
EP = EXPOSED PADDLE
( ) IS FOR THE MAX6933 SSOP
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
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.
PACKAGE TYPE
36 SSOP
PACKAGE CODE
A36-2
DOCUMENT NO.
21-0040
LAND PATTERN NO.
90-0098
44 PLCC
Q44-1
21-0049
90-0236
44 TQFN-EP
T4477-3
21-0144
90-0128
Maxim Integrated
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MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
2/04
Initial release
—
6
1
2
3
1/07
3/07
7/14
Corrected Pin Description
Updated Electrical Characteristics
1, 2, 3, 16
Removed automotive designation and revised Package Information
1, 13
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.
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 specifications 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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