Transistor-transistor logic - Revision history

Jnc: /* Operation */ +link

2022-04-24T01:59:39Z

‎Operation: +link

Jnc: /* Operation */ clarify

2022-04-24T01:58:41Z

‎Operation: clarify

Jnc: +See also

2021-10-14T18:19:19Z

+See also

Jnc: +cat

2018-12-14T18:20:32Z

+cat

Jnc: +link

2018-10-14T12:01:51Z

+link

Jnc: Effing N-dashes!!!!

2018-09-14T19:41:39Z

Effing N-dashes!!!!

Jnc: Mention common acronym

2018-09-14T19:40:18Z

Mention common acronym

Jnc: Fix ext link

2018-09-14T19:10:43Z

Fix ext link

Jnc: 74 series not as important as overall concept

2018-09-14T19:01:28Z

74 series not as important as overall concept

Jnc: Clarifications

2018-04-23T03:06:09Z

Clarifications

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 ==Operation==
-In TTL, gates produce low outputs by sinking [[current]] to [[ground]] (drawing it ''into'' the gate through the output, seemingly paradoxically): the [[transistor|collector]] of the gate's output transistor is connected to the gate's output, and the [[transistor|emitter]] to ground, and when the gate is on, for a low output, current flows through the transistor to ground. When the gate is off, the output is pulled up via a [[resistor]] connected to the supply voltage.
+In TTL, gates produce low outputs by sinking [[current]] to [[ground]] (drawing it ''into'' the gate through the output, seemingly paradoxically): the [[transistor|collector]] of the gate's output transistor is connected to the gate's output, and the [[transistor|emitter]] to ground, and when the gate is on, for a low output, current flows through the transistor to ground. When the gate is off, the output is pulled up via a [[resistor]] connected to the supply [[voltage]].
 Use of a smaller pull-up resistor results in a gate which can switch faster, but draws more power; similarly a larger one produces a transistor that is slower, but uses less power. These approaches are used in the 74H and 74L TTL families, respectively.

@@ Line 5: / Line 5: @@
 ==Operation==
-In TTL, gates produce low outputs by sinking [[current]] to [[ground]] (drawing it ''into'' the gate through the output, seemingly paradoxically): the [[transistor|collector]] of the gate's output transistor is connected to the gate's output, and the [[transistor|emitter]] to ground, and when the gate is on, current flows through the transistor to ground. When the gate is off, the output is pulled up via a [[resistor]] connected to the supply voltage.
+In TTL, gates produce low outputs by sinking [[current]] to [[ground]] (drawing it ''into'' the gate through the output, seemingly paradoxically): the [[transistor|collector]] of the gate's output transistor is connected to the gate's output, and the [[transistor|emitter]] to ground, and when the gate is on, for a low output, current flows through the transistor to ground. When the gate is off, the output is pulled up via a [[resistor]] connected to the supply voltage.
 Use of a smaller pull-up resistor results in a gate which can switch faster, but draws more power; similarly a larger one produces a transistor that is slower, but uses less power. These approaches are used in the 74H and 74L TTL families, respectively.

← Older revision		Revision as of 18:19, 14 October 2021
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	Most computers from the late 1960s through to the middle 1970s were produced entirely in TTL (although its use in such ways continued until the early 1980s - e.g. the [[IBM 3081]] was built out of TTL), and TTL continued to be widely used for the 'glue' logic between larger [[VLSI]] chips until the 1990s, when the lower voltages used with most [[CMOS]] made them obsolete.		Most computers from the late 1960s through to the middle 1970s were produced entirely in TTL (although its use in such ways continued until the early 1980s - e.g. the [[IBM 3081]] was built out of TTL), and TTL continued to be widely used for the 'glue' logic between larger [[VLSI]] chips until the 1990s, when the lower voltages used with most [[CMOS]] made them obsolete.
		+
		+	==See also==
		+
		+	* [[emitter-coupled logic\|ECL]]

	==External links==		==External links==

← Older revision		Revision as of 18:20, 14 December 2018
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	* [http://en.wikipedia.org/wiki/Transistor–transistor_logic TTL article on Wikipedia] - has comprehensive coverage of the topic		* [http://en.wikipedia.org/wiki/Transistor–transistor_logic TTL article on Wikipedia] - has comprehensive coverage of the topic
		+
		+	[[Category: Technology‎]]

← Older revision		Revision as of 12:01, 14 October 2018
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−	'''Transistor-transistor logic''' (usually referred to by its acronym, '''TTL''') is a [[logic]] ~~[[circuit]] family~~ which replaced the earlier [[diode-transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].	+	'''Transistor-transistor logic''' (usually referred to by its acronym, '''TTL''') is a [[logic family]] which replaced the earlier [[diode-transistor logic]]. It is the [[circuit]] type inside the most widespread early [[integrated circuit]] [[logic]] family, the [[74 series]].

	The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.		The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.

← Older revision		Revision as of 19:41, 14 September 2018
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−	'''Transistor-transistor logic''' (usually referred to by its acronym, '''TTL''') is a [[logic]] [[circuit]] family which replaced the earlier [[~~diode–transistor~~ logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].	+	'''Transistor-transistor logic''' (usually referred to by its acronym, '''TTL''') is a [[logic]] [[circuit]] family which replaced the earlier [[diode-transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].

	The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.		The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.

← Older revision		Revision as of 19:40, 14 September 2018
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−	'''Transistor-transistor logic''' is a [[logic]] [[circuit]] family which replaced the earlier [[diode–transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].	+	'''Transistor-transistor logic''' (usually referred to by its acronym, '''TTL''') is a [[logic]] [[circuit]] family which replaced the earlier [[diode–transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].

	The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.		The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.

@@ Line 1: / Line 1: @@
-'''Transistor-transistor logic''' is a [[logic]] circuit family which replaced the earlier [[diode–transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].
+'''Transistor-transistor logic''' is a [[logic]] [[circuit]] family which replaced the earlier [[diode–transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].
 The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.
@@ Line 21: / Line 21: @@
 ==External links==
-* [http://en.wikipedia.org/wiki/Transistor–transistor_logic Transistor–transistor logic TTL article on Wikipedia - has comprehensive coverage of the topic]
+* [http://en.wikipedia.org/wiki/Transistor–transistor_logic TTL article on Wikipedia] - has comprehensive coverage of the topic

← Older revision		Revision as of 19:01, 14 September 2018
Line 1:		Line 1:
−	'''Transistor-transistor logic''' is the circuit type inside the most widespread early [[integrated circuit]] family, the [[74 series~~]]; it replaced the earlier [[diode–transistor logic~~]].	+	'''Transistor-transistor logic''' is a [[logic]] circuit family which replaced the earlier [[diode–transistor logic]]. It is the circuit type inside the most widespread early [[integrated circuit]] logic family, the [[74 series]].

	The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.		The name is derived from the fact that both logic as well as signal-amplification were performed by [[transistor]]s; also, most [[gate]]s are composed of one or more transistors.