MAX6921_10 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 20-Output, 76V, Serial-Interfaced VFD Tube Drivers

19-3020; Rev 1; 4/10
20-Output, 76V, Serial-Interfaced
VFD Tube Drivers
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).
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
Ordering Information
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
+Denotes a lead-free(Pb)/RoHS-compliant package.
/V denotes an automotive qualified part.
White Goods
Gaming Machines
Automotive
Avionics
Instrumentation
Applications
Industrial Weighing
Security
Telecom
VFD Modules
Industrial Control
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
C1
100nF
+5V
7
V_CC
+60V
8
V_BB
C2
100nF
µC
VFDOUT
VFCLK
VFLOAD
VFBLANK
MAX6931
6
DIN
20
22
OUT0–OUT19
CLK
23
LOAD
20
BLANK
V_SS
-7V ⁹
GND
21
C3
100nF
________________________________________________________________ Maxim Integrated Products 1
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.