MAX6920 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 12-Output, 76V, Serial-Interfaced VFD Tube Driver

19-3061; Rev 0; 10/03
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
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).
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 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 20-Pin SO Package
o -40°C to +125°C Temperature Range
White Goods
Gaming Machines
Automotive
Avionics
Applications
Industrial Weighing
Security
Telecom
PART
MAX6920AWP
Ordering Information
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
20 Wide SO
Pin Configuration
TOP VIEW
V_BB 1
DOUT 2
OUT11 3
OUT10 4
OUT9 5
MAX6920AWP
OUT8 6
OUT7 7
OUT6 8
BLANK 9
GND 10
20 V_CC
19 DIN
18 OUT0
17 OUT1
16 OUT2
15 OUT3
14 OUT4
13 OUT5
12 LOAD
11 CLK
Typical Operating Circuit
+5V
C1
100nF
+60V
C2
100nF
µC
VFDOUT
VFCLK
VFLOAD
VFBLANK
20
1
V_CC
V_BB
19
MAX6920
12
DIN OUT0 – OUT11
11
CLK
12
LOAD
9
BLANK
GND
10
________________________________________________________________ Maxim Integrated Products 1
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