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LCX033AK Scheda tecnica(PDF) 5 Page - Sony Corporation |
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LCX033AK Scheda tecnica(HTML) 5 Page - Sony Corporation |
5 / 23 page – 5 – LCX033AK Level Conversion Circuit The LCX033AK 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 power supply of the externally-driven 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 VDD voltage. The Vth values under standard conditions are indicated in the table below. (HST, VST, EN, RGT, VCK, BLK, DWN and STB in the case of a single- phase input) VDD = 12.0V VDD 2 VDD Vth Input voltage [V] Example of single-phase I/O characteristics Item Vth voltage of circuit Vth 0.35 1.50 2.60 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.) VDD 2 VDD 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 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.) 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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