MAX6921AWI Maxim Integrated Products, MAX6921AWI Datasheet

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MAX6921AWI

Manufacturer Part Number
MAX6921AWI
Description
Display Drivers 20-Output High Volta ge Display Driver Ca
Manufacturer
Maxim Integrated Products
Datasheet

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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
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).
19-3020; Rev 1; 4/10
Pin Configurations appear at end of data sheet.
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.
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________________________________________________________________ Maxim Integrated Products
General Description
Industrial Weighing
Security
Telecom
VFD Modules
Industrial Control
Applications
20-Output, 76V, Serial-Interfaced
SS
,
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
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
o Blank Input Simplifies PWM Intensity Control
o Small 28-Pin TSSOP Package
o -40°C to +125°C Temperature Range
+ Denotes a lead-free(Pb)/RoHS-compliant package.
/V denotes an automotive qualified part.
MAX6921AUI+
MAX6921AWI/V+
MAX6921AQI+
MAX6931AUI+
Continuously
Driver
PART
µC
VFBLANK
VFD Tube Drivers
VFDOUT
VFLOAD
VFCLK
Typical Operating Circuit
100nF
100nF
C3
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
C1
Ordering Information
TEMP RANGE
22
23
20
6
-7V
+5V
DIN
CLK
LOAD
BLANK
7
V
V
CC
SS
MAX6931
9
OUT0–OUT19
GND
8
V
BB
+60V
21
PIN-PACKAGE
28 TSSOP
28 Wide SO
28 PLCC
28 TSSOP
Features
20
C2
100nF
1

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MAX6921AWI Summary of contents

Page 1

... 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 , SS PART MAX6921AUI+ MAX6921AWI/V+ MAX6921AQI+ MAX6931AUI+ + Denotes a lead-free(Pb)/RoHS-compliant package. /V denotes an automotive qualified part. VFD Tube Drivers Features Ordering Information TEMP RANGE PIN-PACKAGE -40° ...

Page 2

Serial-Interfaced VFD Tube Drivers ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V .........................................................................-0.3V to +80V BB V ...........................................................................-0. (MAX6931 only) ...............................................-12V to +0. (MAX6931 only) .....................................-0.3V to +80V BB ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) ( Typical Operating Circuit , 76V wise noted.) (Note 1) PARAMETER High-Voltage OUT_ Low-Voltage OUT_ (MAX6921 Only) Low-Voltage OUT_ (MAX6931 Only) Rise Time OUT_ (20% to 80%) Fall Time OUT_ (80% ...

Page 4

Serial-Interfaced VFD Tube Drivers ELECTRICAL CHARACTERISTICS (continued) ( Typical Operating Circuit , 76V wise noted.) (Note 1) PARAMETER Rise and Fall Time DOUT CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low ...

Page 5

V = 76V, and T = +25°C, unless otherwise noted LOGIC SUPPLY CURRENT (I vs. TEMPERATURE (OUTPUTS HIGH) 800 V = 5V, CLK = 5MHz CC 750 700 650 V = 3.3V, CLK = ...

Page 6

Serial-Interfaced VFD Tube Drivers PIN WIDE TSSOP NAME SO/PLCC MAX6921 MAX6931 MAX6921 — 9 — OUT19 to 10–19 10–19 — OUT10 OUT19 to — — 3-12 OUT10 BLANK ...

Page 7

V BB 40Ω TYPICAL SLEW-RATE CONTROL 750Ω TYPICAL Figure 2. MAX6921 CMOS Output Driver Structure Detailed Description The MAX6921/MAX6931 are VFD tube drivers compris- ing a 4-wire serial interface driving 20 high-voltage rail- to-rail output ports. The driver is suitable ...

Page 8

Serial-Interfaced VFD Tube Drivers LOAD CLK DIN DOUT Figure 4. 4-Wire Serial Interface Timing Diagram Table 1. 4-Wire Serial Interface Truth Table CLOCK SERIAL SHIFT REGISTER CONTENTS INPUT DATA INPUT CLK … Dn-1 DIN H ...

Page 9

Output Current Ratings The continuous current-source capability is 40mA per output. Outputs can drive up to 75mA as a repetitive peak current, subject to the on-time (output high) being no longer than 1ms, and the duty cycle being such that ...

Page 10

Serial-Interfaced VFD Tube Drivers A multiplexed tube dissipation example follows ±5 36V to 42V 12 0.4mA 24mA ANODE GRID P = (5.25V ...

Page 11

... Serial-Interfaced TOP VIEW DOUT 2 27 DIN OUT19 3 26 OUT0 OUT18 4 25 OUT1 OUT17 5 24 OUT2 MAX6921AWI OUT16 6 23 OUT3 OUT15 7 22 OUT4 OUT14 8 21 OUT5 20 OUT13 9 OUT6 OUT12 10 19 OUT7 OUT11 11 18 OUT8 OUT10 12 17 OUT9 BLANK 13 16 LOAD ...

Page 12

Serial-Interfaced VFD Tube Drivers Chip Information PROCESS: BiCMOS 12 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2010 Maxim Integrated Products ...

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