| 摘要 |
PURPOSE: An ESD(electro static discharge) protecting circuit is provided to improve an output current of data input/output(DQ) pins and reduce pin capacitance by further comprising bipolar transistors and a resistor. CONSTITUTION: A circuit comprises a pull-up transistor(T1) connected between a power supplied voltage(Vcc) and a DQ pin, and a pull-down transistor(T2) connected between a ground(Vss) and the DQ pin. The circuit further comprises a first bipolar transistor(T3) formed between the Vcc and the DQ pin and connected in parallel with the pull-down transistor(T2), a second bipolar transistor(T4) formed between the Vss and the DQ pin and connected in parallel with the pull-up transistor(T1), and a resistor(R1) connected between the DQ pin and the pull-up and pull-down transistors(T1,T2).
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