Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - display driver VF 4-wire, Seriell 2 mA PLCC 44

● White Goods

● Gaming Machines

● Avionics

● Instrumentation

● Industrial Weighing

● Security

● Telecom

● VFD Modules

● Industrial Control

General Description

The MAX6922/MAX6932/MAX6933/MAX6934 multi-out-

put, 76V, vacuum-fluorescent display (VFD) tube driv-

ers that interface a VFD tube to a microcontroller or a

VFD controller, such as the MAX6850–MAX6853. The

MAX6922/MAX6934 have 32 outputs, while the MAX6932

has 27 outputs, and the MAX6933 has 28 outputs. All

devices are also suitable for driving telecom relays.

Data is input using standard 4-wire serial interface

(CLOCK, DATA, LOAD, BLANK) compatible with other

VFD drivers and controllers.

For easy display control, the active-high BLANK input

forces all driver outputs low, turning the display off, and

automatically puts the IC into shutdown mode. Display

intensity may also be controlled by directly pulse-width

modulating the BLANK input.

The MAX6922/MAX6932/MAX6934 have a serial inter-

face data output, DOUT, allowing any number of devices

to be cascaded on the same serial interface.

The MAX6932/MAX6933/MAX6934 have a negative sup-

ply voltage input, V

, allowing the drivers’ output swing

to be made bipolar to simplify filament biasing in many

applications.

The MAX6922 is available in a 44-pin PLCC package, the

MAX6932 and MAX6933 are available in 36-pin SSOP

packages, and the MAX6934 is available in 44-pin PLCC

and TQFN packages.

Maxim also offers a 12-output VFD driver (MAX6920) and

20-output VFD drivers (MAX6921/MAX6931).

Applications

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

(MAX6932/MAX6933/MAX6934 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

● -40°C to +125°C Temperature Range as Standard

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX6922AQH -40°C to +125°C 44 PLCC

MAX6932AAX -40°C to +125°C 36 SSOP

MAX6933AAX -40°C to +125°C 36 SSOP

MAX6934AQH -40°C to +125°C 44 PLCC

MAX6934ATH -40°C to +125°C 44 TQFN-EP*

PART

NO. OF

OUTPUTS

BIPOLAR

OUTPUT

SWING

DOUT FOR

CASCADING

MAX6922 32 No Yes

MAX6932 27 Yes Yes

MAX6933 28 Yes No

MAX6934 32 Yes Yes

MAX6934

DIN

CLK

LOAD

BLANK

VFDOUT

VFCLK

VFLOAD

VFBLANK

VFD TUBE

12 16

THIN QFN

GND

-7V

µC

100nF

+5V

100nF

+60V

OUT0–OUT31

MAX6922/MAX6932/

MAX6933/MAX6934

27-, 28-, and 32-Output, 76V,

Serial-Interfaced VFD Tube Drivers

19-3224; Rev 3; 7/14

Typical Operating Circuit

Selector Guide

Ordering Information

Summary of content (14 pages)

PAGE 1
27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers General Description The MAX6922/MAX6932/MAX6933/MAX6934 multi-output, 76V, vacuum-fluorescent display (VFD) tube drivers that interface a VFD tube to a microcontroller or a VFD controller, such as the MAX6850–MAX6853. The MAX6922/MAX6934 have 32 outputs, while the MAX6932 has 27 outputs, and the MAX6933 has 28 outputs. All devices are also suitable for driving telecom relays.
PAGE 2
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Absolute Maximum Ratings (Voltage with respect to GND.) VBB.........................................................................-0.3V to +80V VCC...........................................................................-0.3V to +6V VSS (MAX6932/MAX6933/MAX6934 only)............-12V to +0.3V VBB - VSS (MAX6932/MAX6933/MAX6934 only)....-0.3V to +80V OUT_ (MAX6922 only).................(GND - -0.
PAGE 3
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Electrical Characteristics (continued) (Typical Operating Circuit, VBB = 8V to 76V, VCC = 3V to 5.5V, VSS = -11V to 0V, VBB - VSS ≤ 76V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 4
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Electrical Characteristics (continued) (Typical Operating Circuit, VBB = 8V to 76V, VCC = 3V to 5.5V, VSS = -11V to 0V, VBB - VSS ≤ 76V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS CDOUT = 10pF (Note 2) Rise and Fall Time DOUT MIN TYP MAX 3V to 4.5V 80 130 4.5V to 5.
PAGE 5
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Typical Operating Characteristics (continued) (VCC = 5.0V, VBB = 76V, and TA = +25°C, unless otherwise noted.) 0.9 0.8 VCC = 3.3V, CLK = 5MHz VCC = 5V, CLK = IDLE 0.7 0.6 0 20 40 12 VBB = 40V 10 8 6 VBB = 8V 4 60 80 TEMPERATURE (°C) 100 120 0 IOUT = -40mA VBB = 40V 3.0 2.5 MAX6922 toc06 3.5 OUTPUT VOLTAGE (VBB - VT) vs. TEMPERATURE (OUTPUTS HIGH) VBB = 76V 2.0 1.5 VBB = 8V 1.0 0.
PAGE 6
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Pin Description PIN MAX6922/ MAX6934 PLCC MAX6932/ MAX6933 SSOP MAX6934 TQFN NAME 1 1 39 VBB 2 2 40 FUNCTION VFD Supply Voltage DOUT Serial-Data Output. Data is clocked out of the internal shift register to DOUT (MAX6932) on CLK’s falling edge. For the MAX6933 only—VFD anode and grid driver. (OUT27) (OUT27 is a push-pull output swinging from VBB to VSS.
PAGE 7
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers CLK MAX6922/MAX6932/ MAX6934 ONLY SERIAL-TO-PARALLEL SHIFT REGISTER DIN DOUT LATCHES LOAD BLANK MAX6922 MAX6932 MAX6933 MAX6934 WHERE n = 27 FOR MAX6932 28 FOR MAX6933 32 FOR MAX6922/MAX6934 OUT0 OUT1 OUT2 OUTn Figure 1. MAX6922/MAX6932/MAX6933/MAX6934 Functional Diagram VBB VBB SLEW-RATE CONTROL 40Ω TYPICAL OUT_ 750Ω TYPICAL 40W TYPICAL SLEW-RATE CONTROL OUT_ 750W TYPICAL VSS Figure 2.
PAGE 8
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Each driver output is a slew-rate controlled CMOS pushpull switch driving between VBB and GND (MAX6922) or VBB and VSS (MAX6932/MAX6933/ MAX6934). The output rise time is always slower than the output fall time to avoid shoot-through currents during output transitions.
PAGE 9
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Table 1.
PAGE 10
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers characteristics required. Resistor R discharges tube capacitance C to 10% of the initial voltage in 2.3 x RC seconds. So, for example, a 15kΩ value for R discharges 100pF tube grid or anode from 40V to 4V in 3.5µs, but draws an additional 2.7mA from the driver when either output is high.
PAGE 11
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Typical Application Circuit MAX685x MAX6922 VFDOUT DIN VFCLK CLK VFLOAD LOAD VFBLANK BLANK DOUT MAX6922 VFD TUBE DIN CLK LOAD BLANK DOUT MAX6922 DIN CLK LOAD BLANK DOUT Chip Information PROCESS: BiCMOS www.maximintegrated.
PAGE 12
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers 2 1 OUT2 3 OUT1 4 OUT0 VBB 5 DIN DOUT 6 VCC OUT31 44 43 42 41 40 OUT30 1 N.C. 2 OUT29 VBB 3 OUT2 DOUT 4 OUT1 OUT31 5 OUT0 OUT30 6 DIN N.C.
PAGE 13
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. LAND PATTERN NO.
PAGE 14
MAX6922/MAX6932/ MAX6933/MAX6934 27-, 28-, and 32-Output, 76V, Serial-Interfaced VFD Tube Drivers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 2/04 Initial release — 1 1/07 Corrected Pin Description 6 2 3/07 Updated Electrical Characteristics 3 7/14 Removed automotive designation and revised Package Information DESCRIPTION 1, 2, 3, 16 1, 13 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s websit