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MAX6931AUI+T

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX6921/MAX6931 are 20-output, 76V, vacuum-
fluorescent display (VFD) tube drivers that interface a
multiplexed VFD tube to a VFD controller, such as the
MAX6850–MAX6853, or to a microcontroller. The
MAX6921/MAX6931 are also ideal for driving static VFD
tubes or telecom relays.
Data is input using an industry standard 4-wire serial
interface (CLOCK, DATA, LOAD, BLANK), compatibile
with either Maxim’s or industry-standard VFD driver and
controller.
For easy display control, the active-high BLANK input
forces all driver outputs low, turning the display off, and
automatically puts the MAX6921/MAX6931 into shut-
down mode. Display intensity can also be controlled by
directly pulse-width modulating the BLANK input.
The MAX6921 has a serial interface data output, DOUT,
allowing any number of devices to be cascaded on the
same serial interface.
The MAX6931 has a negative supply voltage input, V
SS
,
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).
Applications
White Goods Industrial Weighing
Gaming Machines Security
Automotive Telecom
Avionics VFD Modules
Instrumentation Industrial Control
Features
o 5MHz Industry-Standard 4-Wire Serial Interface
o 3V to 5.5V Logic Supply Range
o 8V to 76V Grid/Anode Supply Range
o -11V to 0V Filament Bias Supply (MAX6931 Only)
o Push-Pull CMOS High-Voltage Outputs
o Outputs can Source 40mA, Sink 4mA
Continuously
o Outputs can Source 75mA Repetitive Pulses
o Outputs can be Paralleled for Higher Current Drive
o Any Output can be Used as a Grid or an Anode
Driver
o Blank Input Simplifies PWM Intensity Control
o Small 28-Pin TSSOP Package
o -40°C to +125°C Temperature Range
MAX6921/MAX6931
20-Output, 76V, Serial-Interfaced
VFD Tube Drivers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-3020; Rev 1; 4/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX6921AUI+ -40°C to +125°C 28 TSSOP
MAX6921AWI/V+ -40°C to +125°C 28 Wide SO
MAX6921AQI+ -40°C to +125°C 28 PLCC
MAX6931AUI+ -40°C to +125°C 28 TSSOP
MAX6931
DIN
CLK
LOAD
BLANK
VFDOUT
VFCLK
VFLOAD
VFBLANK
VFD TUBE
921
GND
-7V
6
22
µC
23
20
C1
100nF
C3
100nF
+5V
7
V
CC
V
SS
C2
100nF
+60V
8
V
BB
OUT0–OUT19
20
Typical Operating Circuit
Pin Configurations appear at end of data sheet.
+
Denotes a lead-free(Pb)/RoHS-compliant package.
/V denotes an automotive qualified part.
MAX6921/MAX6931
20-Output, 76V, Serial-Interfaced
VFD Tube Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
Voltage (with respect to GND)
V
BB
.........................................................................-0.3V to +80V
V
CC
...........................................................................-0.3V to +6V
V
SS
(MAX6931 only) ...............................................-12V to +0.3V
V
BB
- V
SS
(MAX6931 only) .....................................-0.3V to +80V
OUT_ (MAX6921 only) ..................(GND - -0.3V) to (V
BB
+ 0.3V)
OUT_ (MAX6931 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 .........................-540mA
Total OUT_ Continuous Sink Current .................................90mA
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)
28-Pin TSSOP (derate 12.8mW/°C
over +70°C)................................................................1025mW
28-Pin Wide SO (derate 12.5mW/°C
over +70°C)................................................................1000mW
28-Pin PLCC (derate 10.5mW/°C
over +70°C)..................................................................842mW
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
Soldering Temperature (reflow)
Wide SO, TSSOP lead(Pb)-free ...................................+260°C
PLCC lead(Pb)-free......................................................+245°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic Supply Voltage V
CC
3 5.5 V
Tube Supply Voltage V
BB
876V
Bias Supply Voltage
(MAX6931 Only)
V
SS
-11 0 V
Total Supply Voltage
(MAX6931 Only)
V
BB
- V
SS
76 V
T
A
= +25°C 78 170
All outputs OUT_ low,
CLK = idle
T
A
= -40°C to +125°C 200
T
A
= +25°C 540 900
Logic Supply Operating Current I
CC
All outputs OUT_ high,
CLK = idle
T
A
= -40°C to +125°C 1000
µA
T
A
= +25°C 1.65 3.0
All outputs OUT_ low
T
A
= -40°C to +125°C 6.9
T
A
= +25°C 0.85 1.3
Tube Supply Operating Current I
BB
All outputs OUT_ high
T
A
= -40°C to +125°C 1.4
mA
T
A
= +25°C -0.8 -0.38
All outputs OUT_ low
T
A
= -40°C to +125°C -1.9
T
A
= +25°C -1.4 -0.87
Bias Supply Operating Current
(MAX6931 Only)
I
SS
All outputs OUT_ high
T
A
= -40°C to +125°C -1.5
mA
MAX6921/MAX6931
20-Output, 76V, Serial-Interfaced
VFD Tube Drivers
_______________________________________________________________________________________ 3
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 CONDITIONS MIN TYP MAX UNITS
T
A
= +25°C V
BB
- 2
T
A
= -40°C to +85°C V
BB
- 2.5
V
BB
≥ 15V
I
OUT
= -25mA
T
A
= -40°C to +125°C
T
A
= -40°C to +85°C V
BB
- 3.5
V
BB
≥ 15V
I
OUT
= -40mA
T
A
= -40°C to +125°C V
BB
- 4.0
T
A
= +25°C V
BB
- 1.2
T
A
= -40°C to +85°C V
BB
- 2.5
High-Voltage OUT_
8V < V
BB
< 15V
I
OUT
= -25mA
T
A
= -40°C to +125°C V
BB
- 3.0
V
T
A
= +25°C 0.75 1
T
A
= -40°C to +85°C 1.5
V
BB
≥ 15V
I
OUT
= 1mA
T
A
= -40°C to +125°C 1.9
T
A
= +25°C 0.8 1.1
T
A
= -40°C to +85°C 1.6
Low-Voltage OUT_
(MAX6921 Only)
V
L
8V < V
BB
< 15V
I
OUT
= 1mA
T
A
= -40°C to +125°C 2.0
V
T
A
= +25°C V
SS
+ 0.75 V
SS
+ 1
T
A
= -40°C to +85°C V
SS
+ 1.5
V
BB
≥ 15V
I
OUT
= 1mA
T
A
= -40°C to +125°C V
SS
+ 1.9
T
A
= +25°C V
SS
+ 0.8 V
SS
+ 1.1
T
A
= -40°C to +85°C V
SS
+ 1.6
Low-Voltage OUT_
(MAX6931 Only)
V
L
8V < V
BB
< 15V
I
OUT
= 1mA
T
A
= -40°C to +125°C V
SS
+ 2.0
V
Rise Time OUT_ (20% to 80%) t
R
V
BB
= 60V, C
L
= 50pF, R
L
=2.3kΩ 0.9 2 µs
Fall Time OUT_ (80% to 20%) t
F
V
BB
= 60V, C
L
= 50pF, R
L
=2.3kΩ 0.6 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) 0.5 1.3 2.5 µs
Input Leakage Current
CLK, DIN, LOAD, BLANK
I
IH
, I
IL
0.05 10 µA
Logic-High Input Voltage
CLK, DIN, LOAD, BLANK
V
IH
0.8 x
V
CC
V
Logic-Low Input Voltage
CLK, DIN, LOAD, BLANK
V
IL
0.3 x
V
CC
V
Hysteresis Voltage
DIN, CLK, LOAD, BLANK
∆V
I
0.6 V
High-Voltage DOUT V
OH
I
SOURCE
= -1.0mA
V
CC
-
0.5
V
Low-Voltage DOUT V
OL
I
SINK
= 1.0mA 0.5 V
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX6931AUI+T

Mfr. #:
Buy MAX6931AUI+T
Manufacturer:
Maxim Integrated
Description:
VFD Drivers 20-Output 76V Serial VFD Tube Drive
Lifecycle:
New from this manufacturer.
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