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How to measure input leakage current?
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.
What is pin leakage?
Leakage current in laptops or devices using two pin plugs is mostly through the signal cables connected to other grounded or ungrounded equipment such as printers. These results into small current leaking or flowing through the through the dielectric, in the case of a capacitor.
Where can I find spec of input leakage current?
In the datasheet (like http://www.mouser.com/ds/2/149/NC7SZ125-98364.pdf ), there is a spec of input leakage current ( +/- 10uA in this case). I’m wondering about this current. Is this current flow inside to the chip? or it can be out from the chip? Why is there a -10uA current? Does it mean that the current may flow out of the pin?
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.
How is the IIL of an input pin measured?
Measuring the current when a logic-low is applied to an input pin will yield the IIL of that particular pin. This value can then be compared to the acceptable limits of the leakage current for that device which are usually in the uA range or below.