초록 ▼

There is provided emitter coupled logic (ECL) circuitry comprising a differential amplifier circuit for receiving an input signal and a reference potential Vbb, and for causing an output circuit to make a transition to its high state by charging a parasitic capacitor which is parasitic in the output

There is provided emitter coupled logic (ECL) circuitry comprising a differential amplifier circuit for receiving an input signal and a reference potential Vbb, and for causing an output circuit to make a transition to its high state by charging a parasitic capacitor which is parasitic in the output circuit, and make a transition to its low state by discharging a charge stored in the parasitic capacitor to a potential Vtt by way of a load resister, according to whether or not the level of the input signal is larger than the reference potential Vbb, and a discharge switching circuit which can switch to its conductive state in response to a control signal applied thereto so that the charge stored in the parasitic capacitor is also discharged to the negative potential Vee by way of the discharge switching circuit.

대표청구항 ▼

[ What is claimed is:] [1.] Emitter coupled logic (ECL) circuitry comprising:an output means including an output terminal, an emitter-follower transistor having an emitter connected to said output terminal, and a load resistor connected between said output terminal and a potential Vtt;a differential

[ What is claimed is:] [1.] Emitter coupled logic (ECL) circuitry comprising:an output means including an output terminal, an emitter-follower transistor having an emitter connected to said output terminal, and a load resistor connected between said output terminal and a potential Vtt;a differential amplifier means for receiving an input signal and a reference potential Vbb, and for causing said output means to charge a parasitic capacitor which is parasitic in said output means so that the output of said output means makes a transition to its high state, or discharge a charge stored in the parasitic capacitor to the potential Vtt by way of said load resistor so that the output of said output means makes a transition to its low state, according to whether or not the level of the input signal is larger than the reference potential Vbb; anda discharge switching means having a terminal connected to said output means and another terminal connected to a negative potential Vee, which can switch to its conductive state in response to a control signal from outside thewherein said discharge switching means includes a resistor connected to the negative potential Vee, and a third terminal connected to said discharge switching means for receiving a threshold potential, and said discharge switching means can switch to its conductive state according to a difference between the level of the control signal and the threshold potential, so that the charge stored in the parasitic capacitor is also discharged to the negative potential Vee by way of said resistor of said discharge switching means.