SIMBOLS

TERMS

DEFINITIONS

VIL

Low-level input voltage

Measure without load.

Input voltage such that the derivative of the output voltage is equal to -1, as soon as the latter leaves the high logic level (fig.1).

VIH

High-level input voltage

Measure without load.

Input voltage such that the derivative of the output voltage is equal to -1, as soon as the latter leaves the low logic level (fig.1).

VOLmin

Low-level output voltage

Measure without load.

Output voltage value for VIN =Vcc (fig.1).

VOL

Maximum low-level output voltage

Measure without load.

Output voltage value for VIN=VIH (fig.1).

VOHmax

High-level output voltage

Measure without load.

Output voltage value for VIN=0 (fig.1).

VOH

Minimum high-level output voltage

Measure without load.

Output voltage value for VIN=VIL (fig.1).

NML

Low noise margin

The maximum positive increase of the output voltage at low logic level so that the latter is recognized as such again:

NML = VIL - VOL.

NMH

High noise margin

The maximum negative increase of the output voltage at high logic level so that the latter is recognized as such again:

NMH = VOH - VIH.

ZT

Relative transition region

Transition region valued as percentage of minimum swing:

ZT = ( VIH - VIL ) / (VOH - VOL) %.

IIH

High-level input current

Measure with load.

The current into the input of the load when a high-level voltage is established at the output of the driver.

IIL

Low-level input current

Measure with load.

The current into the input of the load when a low-level voltage is established at the output of the driver.

IOH

Maximum high-level output current

Measure without load.

The current delivered by a current source connected to the output such that VOUT=VOH.

IOL

Maximum low-level output current

Measure without load.

The current delivered by a current source connected to the output such that VOUT=VOL.

IOS

Short-circuit output current

Measure without load.

The output current when the output voltage is null with input conditions applied to establish the output logic level farthest from ground potential.

Pcc(OH)

Power absorbed to high-level output

Measure with load.

Power absorbed from supply by the driver gate when its output voltage is high. The power of the driver gate yielded to input voltage source is replaced with the power of the load gate yielded to driver gate when the latter has a low output voltage.

Pcc(OL)

Power absorbed to low-level output

Measure with load.

Power absorbed from supply by the driver gate when its output voltage is low.

Pcc

Average power absorbed

Average power absorbed from the supply by the gate for both output logic states: Pcc = [ Pcc(OH) + Pcc(OL) ] / 2.

control Y

Commutation control

tPLH

Propagation delay time output Low- to-High transition

Measure without load.

The time between the 50 % of the input H® L transition and the 50 % of the output L® H transition (fig.2).

tPHL

Propagation delay time output High- to-Low transition

Measure without load.

The time between the 50 % of the input L® H transition and the 50 % of the output H® L transition (fig.2).

tP

Propagation delay time

Average propagation delay time of a transition:

tP = ( tPLH + tPHL ) / 2.

DP

Power-Delay product

Product of the average power absorbed Pcc and the average propagation delay time:

DP= Pcc × tP.

Pav

Average dynamic power absorbed

Measure with load.

Pav is valued as average power absorbed from the supply on 10 periods of the 10 MHz input waveform, in total T= 1m s. From the last oscillation of the average temporal power curve, we have estimated the excursion levels (Pm and PM in fig.3) and valued Pav as: Pav = ( Pm + PM ) / 2.

D

Relative error on the average dynamic power absorbed

In the same operative conditions above, we estimate the relative error as half-width of the last oscillation of the average temporal power curve and we report it as percentage of Pav (fig.3):

D = [ ( PM - Pm ) / 2 Pav ] % = [ ( PM-Pm) / (PM+Pm) ] %.

td

Delay time

Measure without load.

The time between the 50 % of the input H® L transition and the 10 % VOH point of the output L® H transition (fig.4).

ts

Storage time

Measure without load.

The time between the 50 % of the input L® H transition and the 90 % VOH point of the output H® L transition (fig.4).

tr

Rise time

Measure without load.

The time between the 10 % and the 90 % VOH points of the output L® H transition (fig.4).

tf

Fall time

Measure without load.

The time between the 90 % and the 10 % VOH points of the output H® L transition (fig.4).

tON

Turn on time

The time between the 50 % of the input H® L transition and the 90 % VOH point of the output L® H transition (fig.4). It is obvious that: tON = td + tr.

tOFF

Turn off time

The time between the 50 % of the input L® H transition and the 10 % VOH point of the output H® L transition (fig.4). It is obvious that: tOFF = ts + tf.