Test Parameter

Typical Description

Logic High Input Voltage, Vih (Logic "1")

This is the minimum voltage that an input of a CMOS digital IC is guaranteed to recognize as a Logic "1".

Typical Spec: 3.5 V min. for Vss = 5V

Logic Low Input Voltage, Vil (Logic "0")

This is the maximum voltage that an input of a CMOS digital IC is guaranteed to recognize as a Logic "0".

Typical Spec: 1.5 V max. for Vss = 5V

Logic High Output Voltage, Voh (Logic "1")

This is the minimum voltage that an output of a CMOS digital IC is guaranteed to deliver as a Logic "1".

Typical Spec: 4.99 V min. for Vss = 5V

Logic Low Output Voltage, Vol (Logic "0")

This is the maximum voltage that an output of a CMOS digital IC is guaranteed to deliver as a Logic "0".

Typical Spec: 0.01 V max. for Vss = 5V

Logic High Input Current, Iih

This is the minimum amount of current needed by an input of a CMOS digital IC to stay at Logic "1".

Example of an Actual Spec:

+10 pA min. when Vss = 5V; Vin = 3.5V

Logic Low Input Current, Iil  

This is the maximum amount of current that the input of a CMOS digital IC can sink to stay at Logic "0".

Example of an Actual Spec:

-10 pA max. when Vss = 5V; Vin = 1.5V

Logic High Output Current, Ioh

This is the maximum amount of current that an output of a CMOS digital IC can source while at Logic "1".

Example of an Actual Spec:

-0.5 mA max. when Vss = 5V; Vin = 3.5V

Logic Low Output Current, Iol  

This is the maximum amount of current that an output of a CMOS digital IC can sink while at Logic "0".

Example of an Actual Spec:

+0.4 mA max. when Vss = 5V; Vin = 1.5V