Datasheet

Detailed Description
The MAX6922/MAX6932/MAX6933/MAX6934 are VFD
tube drivers comprising a 4-wire serial interface driving
high-voltage rail-to-rail output ports. The driver is suitable
for both static and multiplexed displays.
The output ports feature high current-sourcing capability
to drive current into grids and anodes of static or multiplex
VFDs. The ports also have active current sinking for fast
discharge of capacitive display electrodes in multiplexing
applications.
The 4-wire serial interface comprises a shift register and
transparent latch with 32 bits for the MAX6922/MAX6934,
28 bits for the MAX6933, and 27 bits for the MAX6932.
The shift register is written through a clock input CLK and
a data input DIN. For the MAX6922/MAX6932/MAX6934,
the data propagates to a data output DOUT. The data out-
put allows multiple drivers to be cascaded and operated
together. The output latch is transparent to the shift reg-
ister outputs when LOAD is high, and latches the current
state on the falling edge of LOAD.
Figure 3. MAX6932/MAX6933/MAX6934 CMOS Output Driver
Structure
Figure 2. MAX6922 CMOS Output Driver Structure
Figure 1. MAX6922/MAX6932/MAX6933/MAX6934 Functional Diagram
SLEW-RATE
CONTROL
V
BB
V
SS
OUT_
40W
TYPICAL
750W
TYPICAL
SLEW-RATE
CONTROL
V
BB
OUT_
40Ω
TYPICAL
750Ω
TYPICAL
SERIAL-TO-PARALLEL SHIFT REGISTER
LATCHES
CLK
DIN
LOAD
BLANK
OUT0 OUT1 OUT2
OUTn
WHERE n =
27 FOR MAX6932
28 FOR MAX6933
32 FOR MAX6922/MAX6934
DOUT
MAX6922/MAX6932/
MAX6934 ONLY
MAX6922
MAX6932
MAX6933
MAX6934
www.maximintegrated.com
Maxim Integrated │ 7
MAX6922/MAX6932/
MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers