Rainbow Electronics MAX6934 User Manual

MAX6922/MAX6932/MAX6933/MAX6934

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

Serial-Interfaced VFD Tube Drivers

________________________________________________________________ Maxim Integrated Products 1

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.

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.

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 inter­face data output, DOUT, allowing any number of
devices to be cascaded on the same serial interface.

The MAX6932/MAX6933/MAX6934 have a negative
supply voltage input, VSS, 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 44­pin PLCC and thin QFN packages.

Maxim also offers a 12-output VFD driver (MAX6920)
and 20-output VFD drivers (MAX6921/MAX6931).

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

(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

Ordering Information

19-3224; Rev 0; 1/04

PART TEMP RANGE PIN-PACKAGE

MAX6922AQH

44 PLCC

MAX6932AAX

36 SSOP

MAX6933AAX

36 SSOP

MAX6934AQH

44 PLCC

MAX6934ATH

44 Thin QFN

MAX6934

DIN

CLK

LOAD

BLANK

VFDOUT

VFCLK

VFLOAD

VFBLANK

VFD TUBE

12 16

THIN QFN

GND

-7V

37

17

µC

18

15

C1

100nF

C3

100nF

+5V

38

V

CC

V

SS

C2
100nF

+60V

39

V

BB

OUT0–OUT31

32

Typical Operating Circuit

Pin Configurations appear at end of data sheet.

Selector Guide

PART

NO. OF

BIPOLAR

OUTPUT

SWING

DOUT FOR

CASCADING

MAX6922 32 No Yes
MAX6932 27 Yes Yes
MAX6933 28 Yes No
MAX6934 32 Yes Yes

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

OUTPUTS

MAX6922/MAX6932/MAX6933/MAX6934

27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, VBB= 8V to 76V, VCC= 3V to 5.5V, VSS= -11V to 0V, VBB- VSS≤ 76V, TA= T

MIN

to T

MAX

, unless other-

wise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Voltage (with respect to GND)
V

BB

.........................................................................-0.3V to +80V

V

CC

...........................................................................-0.3V to +6V

V

SS

(MAX6932/MAX6933/MAX6934 only)..............-12V to +0.3V

V

BB

- VSS(MAX6932/MAX6933/MAX6934 only) ....-0.3V to +80V

OUT_ (MAX6922 only) ..................(GND - -0.3V) to (V

BB

+ 0.3V)

OUT_ (MAX6932/MAX6933/MAX6934 only)

........................................................(V

SS

- -0.3V) to (VBB+ 0.3V)

All Other Pins..............................................-0.3V to (V

CC

+ 0.3V)

OUT_ Continuous Source Current ....................................-45mA

OUT_ Pulsed (1ms max, 1/4 max duty) Source Current ...-80mA

Total OUT_ Continuous Source Current .........................-840mA

Total OUT_ Continuous Sink Current ...............................140mA

Total OUT_ Pulsed (1ms max, 1/4 max duty)

Source Current ...........................................................-960mA

OUT_ Sink Current .............................................................15mA

CLK, DIN, LOAD, BLANK, DOUT Current .......................±10mA

Continuous Power Dissipation (T

A

= +70°C)
36-Pin SSOP (derate 11.8mW/°C

over +70°C)..................................................................941mW

44-Pin Thin QFN (derate 27mW/°C

over +70°C)................................................................2165mW

44-Pin PLCC (derate 13.3mW/°C

over +70°C)................................................................1067mW

Operating Temperature Range

(T

MIN

to T

MAX

) ...............................................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Logic Supply Voltage V

CC

3 5.5 V

Tube Supply Voltage V

BB

876V

Bias Supply Voltage (MAX6932/

MAX6933/MAX6934 Only)

V

SS

-11 0 V

Total S up p l y V ol tag e ( M AX 6932/

M AX 6933/M AX 6934 O nl y)

76 V

TA = +25°C 81 170

CLK = idle

200

TA = +25°C

Logic Supply Operating Current

I

CC

CLK = idle

µA

TA = +25°C 2.4 5

6.9

TA = +25°C 1.3 2.1

Tube Supply Operating Current

I

BB

2.2

mA

TA = +25°C

-3

TA = +25°C

Bias Supply Operating Current

( M AX 6932/M AX 6933/M AX 6934
O nl y)

I

SS

mA

TA = +25°C VBB - 1.1
TA = -40°C to +85°C

VBB ≥ 15V,
I

OUT

= -25mA

TA = -40°C to +85°C

VBB ≥ 15V,
I

OUT

= -40mA

TA = +25°C VBB - 1.2
TA = -40°C to +85°C

High-Voltage OUT_ V

H

8V < VBB < 15V,
I

OUT

= -25mA

V

VBB - V

SS

All outputs OUT_ low,

All outputs OUT_ high,

All outputs OUT_ low

All outputs OUT_ high

All outputs OUT_ low

All outputs OUT_ high

TA = -40°C to +125°C

TA = -40°C to +125°C 1500

T

= -40°C to +125°C

A

T

= -40°C to +125°C

A

T

= -40°C to +125°C

A

T

= -40°C to +125°C -2.5

A

TA = -40°C to +125°C VBB - 2.5

TA = -40°C to +125°C VBB - 4.0

TA = -40°C to +125°C VBB - 3.0

-1.3 -0.65

-2.3 -1.5

VBB - 2

VBB - 3.5

VBB - 2.5

860 1400

MAX6922/MAX6932/MAX6933/MAX6934

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

Serial-Interfaced VFD Tube Drivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit, VBB= 8V to 76V, VCC= 3V to 5.5V, VSS= -11V to 0V, VBB- VSS≤ 76V, TA= T

MIN

to T

MAX

, unless other-

wise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TA = +25°C

1.2

TA = -40°C to +85°C 1.5

VBB ≥ 15V,
I

OUT

= 1mA

T

A

= -40°C to +125°C 2.1
TA = +25°C 0.8 1.3
TA = -40°C to +85°C 1.7

Low-Voltage OUT_
( M AX 6932 O nl y)

V

L

8V < VBB < 15V,
I

OUT

= 1mA

T

A

= -40°C to +125°C 2.2

V

TA = +25°C
TA = -40°C to +85°C

VBB ≥ 15V,
I

OUT

= 1mA

T

A

= -40°C to +125°C
TA = +25°C
TA = -40°C to +85°C

Low-Voltage OUT_
( M AX 6932/M AX 6933/M AX 6934
O nl y)

V

L

8V < VBB < 15V,
I

OUT

= 1mA

T

A

= -40°C to +125°C

V

Rise Time OUT_ (20% to 80%) t

R

VBB = 60V, CL = 50pF, RL =2.3kΩ 0.9 2 µs

Fall Time OUT_ (80% to 20%) t

F

V

BB

= 60V, C

L

= 50pF, RL =2.3kΩ 0.6 1.5 µs

SERIAL INTERFACE TIMING CHARACTERISTICS

LOAD Rising to OUT_ Falling
Delay

(Notes 2, 3) 0.9 3 µs

LOAD Rising to OUT_ Rising
Delay

(Notes 2, 3) 1.2 5.5 µs

BLANK Rising to OUT_ Falling
Delay

(Notes 2, 3) 0.9 3 µs

BLANK Falling to OUT_ Rising
Delay

(Notes 2, 3) 0.5 1.3 5.5 µs

Input Leakage Current
CLK, DIN, LOAD, BLANK

I

IH

, I

IL

10 µA

Logic-High Input Voltage
CLK, DIN, LOAD, BLANK

V

IH

0.8 x
V

Logic-Low Input Voltage
CLK, DIN, LOAD, BLANK

V

IL

0.3 x
V

Hysteresis Voltage
DIN, CLK, LOAD, BLANK

∆V

I

0.6 V

High-Voltage DOUT V

OH

I

SOURCE

= -1.0mA

V

CC

-

0.5

V

Low-Voltage DOUT V

OL

I

SINK

= 1.0mA 0.5 V

VSS + 0.75 VSS + 1.2

VSS + 0.8 VSS + 1.3

V

CC

0.75

0.05

VSS + 1.5
VSS + 2.1

VSS + 1.7
VSS + 2.2

V

CC

Typical Operating Characteristics

(VCC= 5.0V, VBB= 76V, and TA= +25°C, unless otherwise noted.)

MAX6922/MAX6932/MAX6933/MAX6934

27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit, VBB= 8V to 76V, VCC= 3V to 5.5V, VSS= -11V to 0V, VBB- VSS≤ 76V, TA= T

MIN

to T

MAX

, unless other-

wise noted.) (Note 1)

PARAMETER

CONDITIONS

UNITS

3V to 4.5V 80 130

Rise and Fall Time DOUT

C

DOUT

= 10pF

(Note 2)

4.5V to 5.5V 50 80

ns

CLK Clock Period t

CP

ns

CLK Pulse-Width High t

CH

90 ns

CLK Pulse-Width Low t

CL

90 ns

CLK Rise to LOAD Rise Hold t

CSH

(Note 2)

ns

DIN Setup Time t

DS

5ns

3.0V to 4.5V 20

DIN Hold Time t

DH

4.5V to 5.5V 15

ns

3.0V to 4.5V 25

240

DOUT Propagation Delay t

DO

C

DOUT

= 10pF

4.5V to 5.5V 20 75 150

ns

LOAD Pulse High t

CSW

60 ns

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: Delay measured from control edge to when output OUT_ changes by 1V.

TUBE SUPPLY CURRENT (IBB)

vs. TEMPERATURE (OUTPUTS LOW)

MAX6922 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1008040 60020-20

0

1.2

0.8

0.4

1.6

2.0

2.4

2.8

-40 120

VBB = 8V

VBB = 40V

VBB = 76V

MAX6922 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1008040 60020-20

0

0.8

0.6

0.4

0.2

1.0

1.2

1.4

1.6

2.0

1.8

-40 120

VBB = 8V

VBB = 40V

VBB = 76V

TUBE SUPPLY CURRENT (IBB)

vs. TEMPERATURE (OUTPUTS HIGH)

MAX6922 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1008040 60020-20

0

0.4

0.3

0.2

0.1

0.5

0.6

0.7

0.8

1.0

0.9

-40 120

LOGIC SUPPLY CURRENT (ICC)

vs. TEMPERATURE (OUTPUTS LOW)

VCC = 5V, CLK = 5MHz

VCC = 3.3V, CLK = 5MHz

VCC = 5V, CLK = IDLE

VCC = 3.3V, CLK = IDLE

SYMBOL

MIN TYP MAX

200

100

120

MAX6922/MAX6932/MAX6933/MAX6934

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

Serial-Interfaced VFD Tube Drivers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= 5.0V, VBB= 76V, and TA= +25°C, unless otherwise noted.)

MAX6922 toc04

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1008040 60020-20

0.6

0.8

0.7

0.9

1.0

1.2

1.1

-40 120

LOGIC SUPPLY CURRENT (ICC)

vs. TEMPERATURE (OUTPUTS HIGH)

VCC = 5V, CLK = 5MHz

VCC = 3.3V, CLK = 5MHz

VCC = 5V, CLK = IDLE

VCC = 3.3V, CLK = IDLE

MAX6922 toc05

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

1008040 60020-20

0

16

14

12

10

8

6

4

2

-40 120

VBB = 8V

VBB = 40V

VBB = 76V

OUTPUT VOLTAGE

vs. TEMPERATURE (OUTPUTS LOW)

I

OUT

= 4mA

MAX6922 toc06

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

1008040 60020-20

0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

-40 120

VBB = 8V

VBB = 76V

VBB = 40V

I

OUT

= -40mA

OUTPUT VOLTAGE (VBB - VT)

vs. TEMPERATURE (OUTPUTS HIGH)

OUTPUT FALL AND RISE TIME

MAX6922 toc07

1µs/div

BLANK
2V/div

OUT
20V/div