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Fall Time Formula

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Fall time is time for a waveform to fall from 80% to 20% of its steady-state value. Check FAQs

t f = 2 \cdot t e - t r

t_f - Fall Time?t_e - Edge Rate?t_r - Rise Time?

Fall Time Example

With values

With units

Only example

Here is how the Fall Time equation looks like with Values.

Here is how the Fall Time equation looks like with Units.

Here is how the Fall Time equation looks like.

9.2 = 2 \cdot 6 - 2.8

9.2ns = 2 \cdot 6ns - 2.8ns

9.2 = 2 \cdot 6 - 2.8

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Fall Time Solution

Follow our step by step solution on how to calculate Fall Time?

FIRST Step Consider the formula

t f = 2 \cdot t e - t r

Next Step Substitute values of Variables

∴

t f = 2 \cdot 6ns - 2.8ns

Next Step Convert Units

∴

t f = 2 \cdot 6E-9s - 2.8E-9s

Next Step Prepare to Evaluate

∴

t f = 2 \cdot 6E-9 - 2.8E-9

Next Step Evaluate

∴

t f = 9.2E-09s

LAST Step Convert to Output's Unit

∴

t f = 9.2ns

Fall Time Formula Elements

Variables

Fall Time

Fall time is time for a waveform to fall from 80% to 20% of its steady-state value.

Symbol: t_f

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Fall Time

Edge Rate

Edge rate is defined as the ratio of rise time to the fall time.

Symbol: t_e

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Edge Rate

Rise Time

Rise Time is defined as the time required for a pulse to rise from 10 per cent to 90 per cent of its steady value in CMOS devices.

Symbol: t_r

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Rise Time

Other formulas in CMOS Delay Characteristics category

Go Edge Rate

t e = \frac{t r + t f}{2}

Go Rise Time

t r = 2 \cdot t e - t f

Go Normalized Delay

d = \frac{t pd}{t c}

Go Propagation Delay

t pd = d \cdot t c

How to Evaluate Fall Time?

Fall Time evaluator uses Fall Time = 2*Edge Rate-Rise Time to evaluate the Fall Time, The Fall time refers to the time it takes for the output voltage of a digital signal to transition from a high logic level (logic '1') to a low logic level (logic '0') during a falling transition. It is a critical parameter that affects the speed, performance, and signal integrity of CMOS digital circuits. Fall Time is denoted by t_f symbol.

How to evaluate Fall Time using this online evaluator? To use this online evaluator for Fall Time, enter Edge Rate (t_e) & Rise Time (t_r) and hit the calculate button.

FAQs on Fall Time

What is the formula to find Fall Time?

The formula of Fall Time is expressed as Fall Time = 2*Edge Rate-Rise Time. Here is an example- 9.2E+9 = 2*6E-09-2.8E-09.

How to calculate Fall Time?

With Edge Rate (t_e) & Rise Time (t_r) we can find Fall Time using the formula - Fall Time = 2*Edge Rate-Rise Time.

Can the Fall Time be negative?

No, the Fall Time, measured in Time cannot be negative.

Which unit is used to measure Fall Time?

Fall Time is usually measured using the Nanosecond[ns] for Time. Second[ns], Millisecond[ns], Microsecond[ns] are the few other units in which Fall Time can be measured.

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Fall Time Formula

Fall Time Example

Fall Time Solution

Fall Time Formula Elements

Other formulas in CMOS Delay Characteristics category

How to Evaluate Fall Time?

FAQs on Fall Time

Variable Name