Rainbow Electronics MAX6931 - Manual

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 may 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
♦ 5MHz Industry-Standard 4-Wire Serial Interface
♦ 3V to 5.5V Logic Supply Range
♦ 8V to 76V Grid/Anode Supply Range
♦ -11V to 0V Filament Bias Supply (MAX6931 Only)
♦ 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 28-Pin TSSOP Package
♦ -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 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
MAX6921AUI -40 °C to +125°C 28 TSSOP
MAX6921AWI -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
9 21
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.