ML9270-01 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – 33-Segment VFD Driver

LAPIS Semiconductor
ML9270-xx
33-Segment VFD Driver
FEDL9270-01
Issue Date: Sep. 1, 2005
GENERAL DESCRIPTION
The ML9270-xx is a monolithic IC designed for directly driving the anode of the vacuum fluorescent display tube.
The device contains a 34-bit shift register circuit, 33-bit latch circuit, PLA (33*33 Matrix) and 33-output circuit on
a single chip.
Display data is serially stored in the shift register at the rising edge of a CLOCK pulse.
Setting the BLANK_BAR pin low allows all the driver outputs to be driven low, which makes it possible to set the
display blanking.
FEATURES
• Logic power supply (V_DD)
: 3.3 V10% or 5.0 V10%
• VFD tube drive power supply (V_DISP ) : 8 to 18 V
• VFD driver output can be connected directly to the VFD tube. No pull-down resistor is required.
• VFD driver output current
· Segment driver (OUTPUT1 to 13) : –6.0 mA (V_DISP = 9.5V)
· Segment driver (OUTPUT14 to 21) : –1.5 mA (V_DISP = 9.5V)
· Segment driver (OUTPUT22 to 33) : –6.0 mA (V_DISP = 9.5V)
• Data transfer speed
: 5.0MHz
• Package
: 44-pin plastic QFP (QFP44-P-910-0.80-2K)
• Built-in power on reset circuit
BLOCK DIAGRAM
VDD
BLANK_BAR
LOAD ENABLE
CLOCK
DATA
VDISP
VDD
< P.O.R >
GND
DATA OUT
SI C
PO-1
PO-2
< 34 bit >
R ^PO-32
PO-33
PO-34
Shift Register
C
D-1 O-1
D-2 O-2
< 33 bit >
D-32 O-32
D-33 O-33
Display data
Latch
< PLA >
33x33 Matrix
OUTPUT1
OUTPUT2
OUTPUT32
OUTPUT33
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