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LCX009AK Datasheet(PDF) 5 Page - Sony Corporation |
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LCX009AK Datasheet(HTML) 5 Page - Sony Corporation |
5 / 22 page – 5 – LCX009AK Level Conversion Circuit The LCX009AK has a built-in level conversion circuit in the clock input unit located inside the panel. The circuit voltage is stepped up to 13.5V. This level conversion circuit meets the specifications of a 3.0V to 5.0V power supply of the externally-driven IC mainly. However, this circuit can operate even with a 12V power supply of the IC. 1. I/O characteristics of level conversion circuit (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 right. The input voltage value that becomes half the output voltage (after voltage conversion) is defined as Vth. The Vth value varies depending on the HVDD and VVDD voltages. 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) HVDD = VVDD = 13.5V HVDD HVDD 2 Vth Input voltage [V] Example of single-phase I/O characteristics Item Vth voltage of circuit Vth 0.35 1.50 2.70 V Symbol Min. Typ. Max. Unit (For a differential input unit) 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, including those of the Vth voltage, are basically the same as those for a single- phased input, the two-phased input phase is defined. (Refer to clock timing conditions.) HVDD HVDD 2 Vth Input voltage [V] Example of differential I/O characteristics 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 diagram 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.) (Electrical characteristics are defined by the grounded input.) VDD Output HCK1 input HCK2 input Level conversion equivalent circuit 0 0 Max. value Input pin voltage [V] 10 Pull-in current characteristics at the input pin |
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