II Input Current
JEDEC – The current at the input terminals.
TI – The current into an input (current into a terminal is given as a positive value).
CMOS inputs sink or source only minute amounts of current (commonly called leakage current) because of the behavior of standard CMOS technology, which is voltage controlled instead of current controlled. As a result, this parameter always should have a maximum specification no greater than a few tens of microamperes. For most bipolar inputs, which are current controlled instead of voltage controlled, a large amount of current is normal (a few milliamperes). In fact, a good method to determine if a device has a CMOS input is to examine its maximum input current specification: if this current is approximately the value of leakage current, typically, this means that it is a CMOS input.
For the data signals of a device without bus-hold, the II specification includes both input and output leakage currents at the I/O pin. For devices that have bus-hold on the data signals, the II specification should apply only to the control inputs because the bus-hold output supplies enough current to overcome any internal input leakage.
An exception to this is an II specification for an overvoltage-tolerant bus-hold input with a test condition of VI >> VCC. This is used to indicate that the overvoltage-tolerant bus-hold output has a Schottky blocking diode in series with the output p-channel pullup transistor to VCC, which prevents current from flowing from the output back into the VCC supply. See II(hold) and Ioff for more information.