Contents
What is input leakage current?
Input leakage current IIN The leakage current that flows through the input terminal when a voltage is present at the input terminal of an IC. Output off-state leakage current IOZ The leakage current of an IC with an open-drain output that flows through the output terminal when it is in the high-impedance state.
What is chassis leakage current?
Leakage current is the current that flows from either AC or DC circuit in a piece of equipment to the chassis, or to the ground, and can be either from the input or the output. Fault currents only occur in the event of a fault (e.g., defective insulation).
Why is the input leakage current so loose?
They make the specification so loose because it speeds up testing and in (most) digital applications nobody cares. The input current is composed of two parts- the smaller part is the gate leakage, which is probably pA or fA, and the reverse leakage of the input protection diodes, which dominates.
How is an input leakage test performed on a chip?
Input leakage tests are performed by measuring the amount of current flow into a high-impedance input pin on a chip. An ideal input pin has infinite impedance and no current flow. In reality, however, it has a very large (but finite) impedance resulting in a very small current flow, illustrated below.
How is input leakage measured in a logic high?
The switching system can scan through pre-configured states, creating the required current and ground paths to the signal pins of the semiconductor device. There, the source measure unit can force the required voltages and measure the resulting leakage currents from each signal pin to ground. In most cases, a logic-high will be 3.3 V.
Where do you find leakage in a circuit?
Leakage current flows unexpectedly in almost all circuits, even when the power is off. Current leakage is not limited to electronics, computers, or small signal circuits, and can be found in industrial equipment and three-phase wiring installations, too.