LCX005 データシートの表示（PDF） - Sony Semiconductor
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LCX005 Datasheet PDF : 22 Pages
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LCX005BK
Level Conversion Circuit
The LCX005BK has a built-in level conversion circuit in the clock input unit located inside the panel. The circuit
voltage is stepped up to VDD inside the panel. This level conversion circuit meets the specifications of a 3.0V to
5.0V power supply of the externally-driven IC.
1. I/O characteristics of level conversion circuit
VDD
(For a single-phase input unit)
An example of the I/O voltage characteristics of a
level conversion circuit is shown in the figure to the
VDD
right. The input voltage value that becomes half the
2
output voltage (after voltage conversion) is defined
as Vth.
The Vth value varies depending on the VDD voltage.
The Vth values under standard conditions are
indicated in the table below. (HST, VST, EN, CLR,
and RGT in the case of a single-phase input)
Example of single-phase
I/O characteristics
Vth
Input voltage [V]
Item
Vth voltage of circuit
Symbol Min.
Vth
0.4
Typ.
1.50
VDD = 13.5V
Max. Unit
2.75 V
(For a differential input unit)
VDD
An example of I/O voltage characteristics of a level
conversion circuit for a differential input is shown in
the figure to the right. Although the characteristics,
VDD
including those of the Vth voltage, are basically the
2
same as those for a single-phased input, the two-
phased input phase is defined. (Refer to clock
timing conditions.)
2. Current characteristics at the input pin of level conversion circuit
A slight pull-in current is generated at the input pin
of the level conversion circuit. (The equivalent
circuit is shown to the right.) The current volume
increases as the voltage at the input pin decreases,
and is maximized when the pin is grounded. (Refer
to electrical characteristics.)
0
Input pin voltage [V]
10
0
Example of differential I/O
characteristics
Vth
Input voltage [V]
VDD
output
Max. value
HCK1
input
HCK2
input
Pull-in current characteristics at the input pin
–5–
Level conversion equivalent circuit
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