IOH High-Level Output Current
JEDEC – The current into the output terminal with input conditions applied that, according to the product specification, establishes a high level at the output.
TI – The current into an output with input conditions applied that, according to the product specification, establishes a high level at the output.
TI data sheets specify currents flowing out of a device as a negative value. IOH max is used as a test condition for VOH. See VOH testing for further details.
Peripheral output drivers have a maximum current drive capability that they can source and still be able to sustain a valid logic-high level. In a static dc state, where current is drawn continuously from the output, because CMOS drivers operate in the linear region, their behavior is somewhat like a low-impedance resistor and increases in voltage potential (i.e., decreases the VOH level) as the increasing current is sourced out of the output pin during a VOH test. Consequently, a TI CMOS device operates with a high-level output current that is above the recommended operating range (but below the absolute maximum rating), but TI does NOT represent that the device can sustain the specified VOH level or that the device will operate without any reliability concerns.