Can somebody explain what is the difference between polarised and non polarised logic input?

Question

Can somebody explain what is the difference between polarised and non polarised logic input?

Answer 1

non-polarized example:

TTL: logic0= +0.5 Volts, logic1= +2.5V

both '0' and '1' are positive voltage

example:

NECL: logic0 = -2.0Volts, logic1=-0.2Volts

both '0' and '1' are negative voltages

polarized example:

AMI (alternate mark inversion).

'1s' are alternately +10 volts and -10 volts

The difference is that polarized logic uses both + and - voltages, whereas non-polarized logic uses only unipolar voltages (but it can be either all + or all -)

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