Wiring with external terminal
Apparatuses in data input/output circuits of a semiconductor device are described. An example apparatus includes an output driver and a pre-output driver. The pre-output driver includes: an output terminal coupled to the output driver and provides an output signal to the output driver; an output stage that receives a data signal and provides the output signal to the output terminal responsive, at least in part, to the data signal; and a slew rate control stage coupled to the output stage and controls a current flowing through the output stage. The output stage is disposed between the slew rate control stage and the output terminal.
1. An apparatus comprising:
an output terminal coupled to an output driver;
a plurality of slew rate control transistors disposed in a slew rate control area, wherein each slew rate control transistor of the plurality of slew rate control transistors includes a power node coupled to a power supply voltage and further includes a control node;
an input transistor in an input area; and
an output transistor in an output area, the output transistor including:
a first node coupled to the control nodes of the plurality of slew rate control transistors;
a second node configured to receive a data signal; and
a third node coupled to the output terminal and configured to provide an output signal responsive, at least in part, to the data signal,
wherein the input area is disposed between the output area and the slew rate control area, and the output area is disposed between the input area and the output terminal.
2. The apparatus of claim 1 , wherein the third node of the output transistor is on a diffusion layer coupled to the output terminal via an output wiring,
wherein the output wiring is outside the slew rate control area.
3. The apparatus of claim 2 , wherein an impedance of the apparatus is associated with a length of the output wiring.
4. The apparatus of claim 1 , further comprising:
an input terminal configured to receive an input signal,
wherein the input transistor includes:
a first node configured to couple to the power supply voltage;
a second node coupled to the input terminal; and
a third node coupled to a data node and configured to provide the data signal on the data node, and
wherein the input area is disposed between the slew rate control area and the output area.
5. The apparatus of claim 4 , wherein the first node of the output transistor is coupled to the control nodes of the plurality of slew rate control transistors via a slew rate control wiring of a conductive layer across the input area.
6. The apparatus of claim 4 , further comprising:
a ZQ control transistor in a ZQ control area, the ZQ control transistor including:
a first node configured to couple to the power supply voltage;
a second node configured to receive a ZQ control signal; and
a third node coupled to the input transistor,
wherein the ZQ control transistor is configured to enable and disable the data node responsive, at least in part, to the ZQ control signal.
7. The apparatus of claim 6 , wherein the ZQ control area is disposed between the slew rate control area and the input area.