| 摘要 |
A transistor-transistor logic circuit, i.e., TTL circuit includes at least one input terminal (IN; IN1, IN2), an output transistor (T10, T1), and elements (1, 2, T11, T12; 3, 4, T2) operatively connected between an input terminal and the base of an output transistor. The elements include a plurality of delay parts, each having a different signal propagation delay time respectively which feed base currents to the base of the output transistor in and at a different times. As a result, a quick change in the output is prevented and thus an overshoot, ringing or noise can be prevented, while realizing an increased driving ability. At the same time, optimum output characteristics can be obtained according to a load to be driven by the TTL circuit.
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