MAX6921_10 MAXIM [Maxim Integrated Products], MAX6921_10 Datasheet

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MAX6921_10

Manufacturer Part Number
MAX6921_10
Description
20-Output, 76V, Serial-Interfaced VFD Tube Drivers
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
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.
White Goods
Gaming Machines
Automotive
Avionics
Instrumentation
________________________________________________________________ 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

Related parts for MAX6921_10

MAX6921_10 Summary of contents

Page 1

Rev 1; 4/10 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 microcontroller. The MAX6921/MAX6931 are also ideal ...

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 ...

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

REVISION REVISION NUMBER DATE 0 10/03 Initial release 1 4/10 Added automotive and lead-free parts to Ordering Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses ...

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