MAX6920_14 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 12-Output, 76V, Serial-Interfaced VFD Tube Driver

MAX6920
12-Output, 76V, Serial-Interfaced VFD Tube Driver
General Description
The MAX6920 is a 12-output, 76V, vacuum fluo-
rescent 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 compatibil-
ity 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 pack-
age. Maxim also offers VFD drivers with either 20
(MAX6921/MAX6931) or 32 outputs (MAX6922 and
MAX6932).
Applications
●● White Goods
●● Gaming Machines
●● Avionics
●● Industrial Weighing
●● Security
●● Telecom
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
Ordering Information
PART
MAX6920AWP
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
20 Wide SO
Pin Configuration
TOP VIEW
VBB 1
DOUT 2
OUT11 3
OUT10 4
OUT9 5 _MAX6920AWP
OUT8 6
OUT7 7
OUT6 8
BLANK 9
GND 10
20 VCC
19 DIN
18 OUT0
17 OUT1
16 OUT2
15 OUT3
14 OUT4
13 OUT5
12 LOAD
11 CLK
Typical Operating Circuit
µC
VFDOUT
VFCLK
VFLOAD
VFBLANK
+5V
C1
100nF
+60V
C2
100nF
20
1
VCC
VBB
MAX6920
19
12
DIN OUT0 – OUT11
11
CLK
12
LOAD
9
BLANK
GND
10
19-3061; Rev 1; 8/14