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# what are level shifters?

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#### rakesh1234

##### Member level 5
Level shifters are used in multivdd design,
Because in multivdd design different blocks are working on different voltages.
So when a signal passes from one voltage domain to another voltage domain the level shifter is needed particularly when a signal passes from low voltage domain to high voltage domain.

The level shifter will convert one voltage level from to another voltage.

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Points: 2

### jenpeng

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#### srkumar81

##### Junior Member level 3
Level shifters are used when the signals goes to one voltage domain to another voltage domain. This LS will amplify the signal for that power domain so that the high Voltage domain cells can read logic-1 or logic-0 correctly. Usually LS are inserted only while crossing low voltage domain to high voltage domain.

danilosoares

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### danilosoares

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#### damn

##### Junior Member level 3
if input is 3.3v then some voltage domain needs 5 v.,then you need ls,

silimlar like max232,

### deh_fuhrer

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#### usaid

##### Junior Member level 3
these are typically used in low-power design flow where core and IOs are operating at separate voltages...

### deh_fuhrer

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#### vinodkumar

##### Full Member level 5
Hi
level shifters are used when we have multiple power supply voltage designs ex one at 0.8v and other at 1.2 V.then level shifters are used at interfaces.

bye

### deh_fuhrer

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#### shiv_emf

what are inner components of level shifter?

#### moorehuang

##### Newbie level 6
always implemented in source follower

#### shiv_emf

shiv_emf said:
what are inner components of level shifter?

no ans??

#### deh_fuhrer

##### Member level 3
Following is a sample circuit for a Level Shifter.
The first is an up-conversion level shifter circuit
and the 2nd one is a down conversion Level shifter.

There are fancier designs available but the above circuits
show how these level shifters behave for down converting
or upconverting.

Products such as Conformal - Low Power (CLP) can detect
whether level shifters are missing between power domains
transitions.
--
ay

kumar_eee

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### kumar_eee

Points: 2

#### funster

##### Full Member level 4
level shifter is a part change one logic level to another logic level, such as from 1.8V to 2.5V, from 2.5V to 1.8V. etc.

deh_fuhrer said: