BU2879AK Datasheet, PDF (1/5 Pages) Rohm – FL tube driver

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.
•^Applications
VCRs
•^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.
•^{Absolute maximum ratings (Ta = 25°C, VSS = 0V)}
Parameter
Symbol
Limits
Unit
Applied voltage 1
VDD
– 0.3 ~ + 7.0
V
Applied voltage 2
VEE
VDD + 0.3 ~ VDD – 40
V
Input voltage
Power dissipation
VIN
– 0.3 ~ VDD + 0.3
V
Pd
850^∗
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.
∗ When mounted on a 70 × 70 × 1.6mm glass epoxy board
•^{Recommended operating conditions (Ta = 25°C, VSS = 0V)}
Parameter
Symbol
Min.
Typ.
Max.
Unit
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
1