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MAX6920AWP+T

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX6920 is a 12-output, 76V, vacuum fluorescent
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 compatibili-
ty 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 package.
Maxim also offers VFD drivers with either 20
(MAX6921/MAX6931) or 32 outputs (MAX6922 and
MAX6932).
Applications
White Goods Industrial Weighing
Gaming Machines Security
Automotive Telecom
Avionics
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
MAX6920
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3061; Rev 0; 10/03
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.
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
V
CC
GND
V
BB
+60V+5V
C1
100nF
C2
100nF
µC
Typical Operating Circuit
TOP VIEW
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
V
CC
DIN
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
LOAD
CLKGND
BLANK
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
DOUT
V
BB
MAX6920AWP
Pin Configuration
MAX6920
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V
BB
= 8V to 76V, V
CC
= 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise 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
OUT_.......................................................-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 .................................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 T
A
= +70°C) ..800mW
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic Supply Voltage V
CC
3 5.5 V
Tube Supply Voltage V
BB
876V
T
A
= +25°C 72 170
All outputs OUT_
low, CLK = idle
T
A
= -40°C to +125°C 200
T
A
= +25°C 350 650
Logic Supply Operating Current I
CC
All outputs OUT_
high, CLK = idle
T
A
= -40°C to +125°C 700
µA
T
A
= +25°C12
All outputs OUT_
low
T
A
= -40°C to +125°C 4.2
T
A
= +25°C 0.53 0.85
Tube Supply Operating Current I
BB
All outputs OUT_
high
T
A
= -40°C to +125°C 0.9
mA
T
A
= +25°CV
BB
- 1.1
T
A
= -40°C to +85°CV
BB
- 2
V
BB
≥ 15V,
I
OUT
= -25mA
T
A
= -40°C to +125°CV
BB
- 2.5
T
A
= -40°C to +85°CV
BB
- 3.5
V
BB
≥ 15V,
I
OUT
= -40mA
T
A
= -40°C to +125°CV
BB
- 4.0
T
A
= +25°CV
BB
- 1.2
T
A
= -40°C to +85°CV
BB
- 2.5
High-Voltage OUT_ V
H
8V < V
BB
< 15V,
I
OUT
= -25mA
T
A
= -40°C to +125°CV
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_ V
L
8V < V
BB
< 15V,
I
OUT
= 1mA
T
A
= -40°C to +125°C 2.0
V
MAX6920
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V
BB
= 8V to 76V, V
CC
= 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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) 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
3V to 4.5V 60 100
Rise and Fall Time DOUT
C
DOUT
= 10pF
(Note 2)
4.5V to 5.5V 30 80
ns
CLK Clock Period t
CP
200 ns
CLK Pulse-Width High t
CH
90 ns
CLK Pulse-Width Low t
CL
90 ns
CLK Rise to LOAD Rise Hold
t
CSH
(Note 2) 100 ns
DIN Setup Time t
DS
5ns
3V to 4.5V 20
DIN Hold Time t
DH
4.5V to 5.5V 15
ns
3.0V to 4.5V 25 120 240
DOUT Propagation Delay t
DO
C
DOUT
= 10pF
4.5V to 5.5V 20 75 150
ns
LOAD Pulse High t
CSW
55 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.
P1-P3P4-P6P7-P9P10-P10

MAX6920AWP+T

Mfr. #:
Buy MAX6920AWP+T
Manufacturer:
Maxim Integrated
Description:
VFD Drivers 12-Output 76V Serial VFD Tube Driver
Lifecycle:
New from this manufacturer.
Delivery:
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