Electronic signals
In digital electronics, there are many different logic families. We will
focus on two of them, the NIM family and the TTL family.
NIM
A NIM signal has the following definition of a digital "1" and a digital "0":
When a signal voltage is between -0.8 V and -1 V, it's a digital "1".
When a signal voltage is exactly 0 V, it's a digital "0".
NIM is an acronym for Nuclear Instrument Modules since it has been
developped for this kind of experiment.
TTL
A TTL signal has the following definition of a digital "1" and a digital "0":
When a signal voltage is between 1.5 V and 5 V, it's a digital "1".
When a signal voltage is between 0 V and 0.7 V, it's a digital "0".
TTL is an acronym for Transistor-Transistor Logic since it is made of
bipolar transistors.
For more informations on digital electronics, please consult Hill &
Horowitz, The Art of
Electronics.
