Digital Circuits - Revision history

Hwang: /* Digital Circuits */

2006-07-12T20:12:37Z

Digital Circuits

← Older revision		Revision as of 15:12, 12 July 2006
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	For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.		For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.

	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.
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	==Terminology==		==Terminology==

Hwang: /* Digital Circuits */

2006-07-07T23:10:23Z

Digital Circuits

← Older revision		Revision as of 18:10, 7 July 2006
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	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.		[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.
			<br clear="all">
	{{Clr}}

	==Terminology==		==Terminology==

Hwang: /* Digital Circuits */

2006-07-07T23:09:57Z

Digital Circuits

← Older revision		Revision as of 18:09, 7 July 2006
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	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.		[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.
			{{Clr}}
	<br>

	==Terminology==		==Terminology==

Hwang: /* Digital Circuits */

2006-07-07T23:07:48Z

Digital Circuits

← Older revision		Revision as of 18:07, 7 July 2006
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	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.		[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.
			<br>

	==Terminology==		==Terminology==

Hwang: /* Digital Circuits */

2006-07-07T23:02:21Z

Digital Circuits

← Older revision		Revision as of 18:02, 7 July 2006
Line 5:		Line 5:
	For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.		For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.

		⚫	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]] Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.
	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]]
⚫	Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.

	==Terminology==		==Terminology==

Hwang: /* Digital Circuits */

2006-07-07T23:01:53Z

Digital Circuits

← Older revision		Revision as of 18:01, 7 July 2006
Line 5:		Line 5:
	For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.		For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.

		⚫	[[Image:DIP_package.jpg\|right\|thumb\|A DIP-14]]
	Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP.		Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP. This package contains a rectangular box with two rows of pins coming out of the long edge. The number the succeeds "DIP" denotes the number of pins in package. The package will often have an indentation or dot at one end to help identify the pins.

⚫	[[Image:DIP_package.jpg]]

	==Terminology==		==Terminology==

Hwang at 22:54, 7 July 2006

2006-07-07T22:54:28Z

← Older revision		Revision as of 17:54, 7 July 2006
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	__TOC__		__TOC__
			==Digital Circuits==
			Unlike analogue circuits, elements in digital logic circuits are in states of either "high" or "low" (usually corresponding to "true" and "false", or "1" and "0"). In most cases, highs and lows are exhibited as voltage levels on the input and output pins of the integrated circuit. Depending on the technology, this voltage level will vary.

			For Transistor-Transistor Logic (TTL) circuits, which is the most popular kind used in electronic projects, ''high'' is anything above 2V, and ''low'' is anything below 0.7V. In these circuits, it is very common to use +5V for ''high'' and ground for ''low.'' If a pin is not connected (neither connected to the ''high'' voltage nor grounded), then it is '''floating'''. TTL chips usually go ''high'' by themselves when floating, but don't count on it. Inputs should never be floating; always have them connected to something.

			Integrated circuits come in different '''packages'''. The package refers to the type of exterior casing that the connects the actual integrated circuit chip to its input and output pins. A common type of package is the ''Dual-In-Line Package'', or DIP.

			[[Image:DIP_package.jpg]]

	==Terminology==		==Terminology==
	===Active Low Input===		===Active Low Input===
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	===High===		===High===
	''High'' usually corresponds to the binary "1", the "on" state, and "true" or "1" in Boolean logic.		''High'' usually corresponds to the binary "1," the "on" state, and "true" or "1" in Boolean logic.

	===Low===		===Low===
	''Low'' usually corresponds to the binary "0", the "off" sate, and "false" or "0" in Boolean logic.		''Low'' usually corresponds to the binary "0," the "off" sate, and "false" or "0" in Boolean logic.

Hwang: Digital moved to Digital Circuits

2006-07-07T20:50:01Z

Digital moved to Digital Circuits

← Older revision	Revision as of 15:50, 7 July 2006
(No difference)

Hwang: /* Terminology */

2006-07-05T15:36:47Z

Terminology

← Older revision		Revision as of 10:36, 5 July 2006
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	===Active Low Input===		===Active Low Input===
	An '''active low''' input means that it is "on" when in input is low, and "off" when the input is high. In schematic diagrams, it is often denoted by a "bubble" at the input pin.		An '''active low''' input means that it is "on" when in input is low, and "off" when the input is high. In schematic diagrams, it is often denoted by a "bubble" at the input pin.

			===High===
			''High'' usually corresponds to the binary "1", the "on" state, and "true" or "1" in Boolean logic.

			===Low===
			''Low'' usually corresponds to the binary "0", the "off" sate, and "false" or "0" in Boolean logic.

Hwang at 18:54, 3 July 2006

2006-07-03T18:54:51Z

← Older revision		Revision as of 13:54, 3 July 2006
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			__TOC__
	==Terminology==		==Terminology==
	===Active Low Input===		===Active Low Input===