Logic family - Revision history

Jnc: link to 74

2019-01-03T23:49:07Z

link to 74

Jnc: +cat

2018-12-14T18:19:12Z

+cat

Jnc: +link

2018-10-14T12:03:48Z

+link

Jnc: A pretty good start

2018-10-14T11:52:36Z

A pretty good start

New page

In generic terms, a '''logic family''' is a group of [[logic]] devices which use common supply [[voltage]](s), and common [[analog]] interfacing rules.

For example, in the [[transistor-transistor logic|TTL]] family, 'true' is normally a high (+5V) output, and 'false' is [[ground]]. (The meanings may be reversed when [[negative logic]] is in use, but the voltage levels remain.)

For a low output, a TTL [[integrated circuit|chip]] will generally sink [[current]] into itself through the output pin (so that the [[signal]] direction is different at the logical and analog levels), send it to ground; for high output, it will source a small amount of current (at the 'high' voltage).

In commercial/marketing terms, a logic family is a line of compatible devices produced by particular manufacturer; e.g. TTL started life as a line of chips from [[Texas Instruments]], before it became effectively a standard.

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−	In generic terms, a '''logic family''' is a group of [[logic]] devices which use common supply [[voltage]](s), and common [[analog]] interfacing rules.	+	In generic terms, a '''logic family''' is a group of [[logic]] devices which use common supply [[voltage]](s), and common [[analog]] interfacing rules for their use in [[circuit]]ry.

	For example, in the [[transistor-transistor logic\|TTL]] family, 'true' is normally a high (+5V) output, and 'false' is [[ground]]. (The meanings may be reversed when [[negative logic]] is in use, but the voltage levels remain.)		For example, in the [[transistor-transistor logic\|TTL]] family, 'true' is normally a high (+5V) output, and 'false' is [[ground]]. (The meanings may be reversed when [[negative logic]] is in use, but the voltage levels remain.)

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 For a low output, a TTL [[integrated circuit|chip]] will generally sink [[current]] into itself through the output pin (so that the [[signal]] direction is different at the logical and analog levels), send it to ground; for high output, it will source a small amount of current (at the 'high' voltage).
-In commercial/marketing terms, a logic family is a line of compatible devices produced by particular manufacturer; e.g. TTL started life as a line of chips from [[Texas Instruments]], before it became effectively a standard.
+In commercial/marketing terms, a logic family is a line of compatible devices produced by particular manufacturer; e.g. the [[74 series]] TTL family started life as a line of chips from [[Texas Instruments]], before it became effectively a standard.
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 [[Category: Technology‎]]