| 摘要 |
PROBLEM TO BE SOLVED: To provide output buffer performance regardless of external factors and linear over the operating voltage range of an output driver by the device of resistors and transistors. SOLUTION: An output buffer for integrated circuit equipped with a predrive step 12 and an output driver step 14 is provided. The output driver step 14 is provided with a pull-up resistor device having parallelly connected plural branch parts and at least one pull-down resistor device in the similar configuration. A pull-up transistor is replaced with a pull-up control transistor and a pull-up data transistor. Similarly, the pull-down transistor is replaced with a pull-down control transistor and a pull-down data transistor. According to control information received from a control bit terminal 24, the resistance of the output buffer is regulated so as to correct the fluctuation of surrounding temperature, operating voltage and process.
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