ml9270 Oki Semiconductor, ml9270 Datasheet - Page 3

• Manufacturer Part Number: ml9270
• Description: 33-segment Vfd Driver
• Manufacturer: Oki Semiconductor

PIN DESCRIPTION
OKI Semiconductor
40 to 44, 1
32 to 38,
11 to 16,
18 to 23
7 to 10
2 to 5,
Pin
24
28
29
26
25
27
30
31
BLANK_BAR
DATA OUT
OUTPUT
OUTPUT
OUTPUT
ENABLE
22 to 33
14 to 21
CLOCK
Symbol
1 to 13
LOAD
DATA
V
GND
V
DISP
DD
Type
—
O
O
O
l
l
l
l
Connects to
Next Device
DATA OUT
Controller
Controller
Controller
Controller
VFD tube
VFD tube
electrode
electrode
ENABLE
supply
anode
Power
Micro-
Micro-
Micro-
Micro-
LOAD
grid
or
or
High voltage driver outputs for driving VFD tube.
The driver outputs are in phase with the corresponding latch
outputs.
The direct connection to the anode of a VFD tube eliminates
pull-down resistors. I
High voltage driver outputs for driving VFD tube.
The driver outputs are in phase with the corresponding latch
outputs.
The direct connection to the anode of a VFD tube eliminates
pull-down resistors. I
Serial data output pin of shift register.
Data in output through the DATA OUT pin in synchronization
with the CLOCK signal. It is possible to use this device as
“Self Load” by connecting DATA with LOAD ENABLE.
V
V
Apply V
Latch signal input pin of display data latch logic.
If the LOAD ENABLE pin is high, the data of the shift register
is through.
If the LOAD ENABLE pin is low, the data of the shift register
does the latch.
BLANK_BAR input pin with a built-in pull-up resistor.
The BLANK_BAR pin is normally being set high.
If the BLANK_BAR pin is low, the all driver outputs are “L”
level.
Serial data input pin of the shift register.
Display data (positive logic) is input in through the DATA pin
synchronization with CLOCK.
Shift register clock input pin.
Shift register reads data through DATA while the CLOCK pin
is low state and the data in the shift register is shifted from
one stage to the next stage at the rising edge of the CLOCK.
DD
DISP
-GND are power supplies for internal logic.
-GND are power supplies for driving fluorescent tubes.
DISP
after V
DD
OH1
OH1
is applied.
Description
> –1.5 mA
> –6.0 mA
PEDL9270A-01
ML9270A-xx
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