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Standard ICs
FL tube driver
BU2879AK
The BU2879AK is a driver IC for fluorescent displays. It is equipped with 26 high-voltage withstand outputs and can
display from 11 segments of 15 characters to 16 segments of 8 characters. This IC is equipped with a key scanning
function, and general-purpose input pins, and is ideal for front panels in VTRs and other equipment. A serial interface
allows functions to be controlled from a microcomputer.
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Applications
VCRs
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Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter
Applied voltage 1
Applied voltage 2
Input voltage
Power dissipation
VDD
VEE
VIN
Pd
– 0.3 ~ + 7.0
VDD + 0.3 ~ VDD – 40
– 0.3 ~ VDD + 0.3
850
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V
Symbol Limits Unit
V
V
mW
Operating temperature Topr – 25 ~ + 75 °C
Storage temperature Tstg – 55 ~ + 125 °C
Note) Operation is not guaranteed at these values.
Note) Power dissipation is reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
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When mounted on a 70 · 70 · 1.6mm glass epoxy board
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Features
1) High withstanding voltage output.
2) Display modes: 11S · 15G ~ 16S · 8G.
3) Variable display luminance (7 steps).
4) 3-wire serial interface.
5) Key scanning function (6 · 4).
6) Internal pull-down resistance
(high voltage withstand output).
7) QFP 44 package.
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Recommended operating conditions (Ta = 25°C, VSS = 0V)
Parameter
Operating power supply voltage 1 VDD 4.5 5.0 5.5 V
Operating power supply voltage 2 VEE VDD – 37 VDD – 35 VDD – 0 V
Symbol Min. Typ. Max. Unit