Rainbow Electronics MAX6920 - Manual (Page 9)

MAX6920
12-Output, 76V, Serial-Interfaced
VFD Tube Driver
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This means that the driver can be operated in this
application up to the MAX6920’s +125°C maximum
operating temperature.
Power-Supply Considerations
The MAX6920 operates with multiple power-supply volt-
ages. Bypass the V
CC and V BB power-supply pins to
GND with a 0.1µF capacitor close to the device. For
multiplex applications, it may be necessary to add an
additional 1µF bulk electrolytic capacitor, or greater, to
the V
BB supply.
Power-Supply Sequencing
The order of the power-supply sequencing is not impor-
tant. The MAX6920 will not be damaged if either V
CC or
V
BB
is grounded (or maintained at any other voltage
below the data sheet minimum), while the other supply
is maintained up to its maximum rating. However, as
with any CMOS device, do not drive the MAX6920’s
logic inputs if the logic supply V
CC is not operational
because the input protection diodes clamp the signals.
MAX6920
DIN
CLK
LOAD
BLANK
MAX685x
VFDOUT
VFCLK
VFLOAD
VFBLANK DOUT
VFD TUBE
MAX6920
DIN
CLK
LOAD
BLANK DOUT
MAX6920
DIN
CLK
LOAD
BLANK DOUT
Typical Application Circuit
Chip Information
TRANSISTOR COUNT: 2743
PROCESS: BiCMOS