Semiconductor & Computer Engineering
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Difference between revisions of "7400 series"
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| − | '''7400 series''' is an [[extended family]] of digital [[integrated circuit]]s. Chips in this series include a variety of [[discrete logic chip]]s chips such as [[and gates]] and [[or gates]] as well as [[register]]s, [[decoder]]s, and [[RAM]] units. While the original series was designed as [[transistor-transistor logic|TTL]] logic chips, over the years, a large number of sub-families have been introduced. | + | [[File:7400_Series_Chips_1.jpg|thumb|right|250px|A series of various 74LS chips.]] |
| + | '''7400 series''' is an [[extended family]] of digital [[integrated circuit]]s. Chips in this series include a variety of [[discrete logic chip]]s chips such as [[and gates]] and [[or gates]] as well as [[register]]s, [[decoder]]s, and [[RAM]] units. | ||
| + | |||
| + | While the original series was designed as [[transistor-transistor logic|TTL]] logic chips, over the years, a large number of sub-families have been introduced. Generally speaking, parts from the same subfamily can be used freely with other parts from the same subfamily. However, in many cases not with parts from other subfamilies. This is because voltage and current configurations for ICs from the same subfamily are designed so they can be connected without requiring additional work. | ||
== Part Identification == | == Part Identification == | ||
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* '''Technology indicator:''' | * '''Technology indicator:''' | ||
| − | :''' | + | :{{main|/logic families}} |
| + | :Some of more popular ones you'll encounter are: | ||
| + | ::'''None''' - When no indicator is found, this implies it's the original [[transistor-transistor logic|TTL]] | ||
| + | ::'''LS''' - Low-power Schottky. Same as ''L'' series but with reduced power consumption and switching speed. | ||
| + | ::'''HC''' - High-speed [[CMOS]], similar to ''LS'' | ||
| + | ::'''HCT''' - High-speed CMOS, with TTL-compatible inputs | ||
* '''Gates Count''' (surface mount ICs only) | * '''Gates Count''' (surface mount ICs only) | ||
Revision as of 00:29, 12 November 2015
7400 series is an extended family of digital integrated circuits. Chips in this series include a variety of discrete logic chips chips such as and gates and or gates as well as registers, decoders, and RAM units.
While the original series was designed as TTL logic chips, over the years, a large number of sub-families have been introduced. Generally speaking, parts from the same subfamily can be used freely with other parts from the same subfamily. However, in many cases not with parts from other subfamilies. This is because voltage and current configurations for ICs from the same subfamily are designed so they can be connected without requiring additional work.
Part Identification
| SN | 74 | HCT | 2G | 04 | N | |
| Package Designation | ||||||
| Device Number | ||||||
| Gates Count | ||||||
| Technology Indicator | ||||||
| Specs/Temp Indicator | ||||||
| Manufacturer Prefix | ||||||
- Specs/Temp Indicator:
- 75 - Interface device
- 74 - Commercial Grade
- 64 - Industrial
- 54 - Military/Airspace Grade
- Technology indicator:
- Main article: /logic families
- Some of more popular ones you'll encounter are:
- Gates Count (surface mount ICs only)
- 1G = 1, 2G = 2, 3G = 3
- Device Number
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- Package Designation
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Example
Chip is labeled DM74LS221N:
- DM - prefix - made by Fairchild or National Semiconductor, but given the F logo, we can determine it's Fairchild.
- 74 - series - commercial grade chip
- LS - techno - Low-power Schottky.
- 221 - device - Dual non-retriggerable monostable multivibrator with reset
- N - package - standard plastic DIP
List of Devices
| Device Number | Description |
|---|---|
| 00 | Quad 2-input NAND gate |
| 01 | Quad 2-input NAND gate; open collector outputs |
| 02 | Quad 2-input NOR gate |
| 03 | Quad 2-input NAND gate; open collector outputs |
| 04 | Hex inverter |
| 05 | Hex inverter; open collector outputs |
| 06 | Hex inverter; open collector high voltage outputs |
| 07 | Hex buffer; open collector high voltage outputs |
| 08 | Quad 2-input AND gate |
| 09 | Quad 2-input AND gate; open collector outputs |
| 10 | Triple 3-input NAND gate |
| 11 | Triple 3-input AND Gate |
| 12 | Triple 3-input NAND gate; open collector outputs |
| 13 | Dual 4-input NAND Schmitt triggers |
| 14 | Hex Schmitt-trigger inverter |
