Difference between revisions of "History of Computers - TTL"
Line 7: | Line 7: | ||
==Overview== | ==Overview== | ||
− | The first family of transistors, Sylvania Universal High-level Logic (SUHL), was produced in 1963. TTL is most often used with integrated circuitry. TTL first became popular with designers after Texas Instruments released the 5400 series which had a military grade temperature range, allowing the integrated circuits to work in hot or cold climates. <ref> [[http://en.wikipedia.org/wiki/Transistor–transistor_logic]]. Wikipedia </ref> In transistor-transistor logic, transistors can both amplify the output and isolate the inputs; a step up from the previous resistor-transistor logic and diode-transistor logic. TTL is bipolar logic, meaning it contains at least one BJT, or a bipolar junction transistor, which contributes to the amplifying power of transistor-transistor logic. | + | The first family of transistors, Sylvania Universal High-level Logic (SUHL), was produced in 1963. TTL is most often used with integrated circuitry. TTL first became popular with designers after Texas Instruments released the 5400 series which had a military grade temperature range, allowing the integrated circuits to work in hot or cold climates. <ref> [[http://en.wikipedia.org/wiki/Transistor–transistor_logic]]. Wikipedia </ref> In transistor-transistor logic, transistors can both amplify the output and isolate the inputs; a step up from the previous resistor-transistor logic and diode-transistor logic. TTL is bipolar logic, meaning it contains at least one BJT, or a bipolar junction transistor, which contributes to the amplifying power of transistor-transistor logic. TTL circuits also include diodes and resistors. TTL circuits are often used to send a low or high signal using a 5V power supply, a low signal being between 0V and .8V and a high signal being between 2V and 5V. |
TTL devices were packaged in through-hole, dual in-line packages. Through-hole meaning devices that have pins that are inserted through holes in circuit boards and are then soldered on the other side and dual in-line meaning the device has a rectangular housing with parallel pins on both sides that are pointed downward allowing for through hole soldering to a circuit board. | TTL devices were packaged in through-hole, dual in-line packages. Through-hole meaning devices that have pins that are inserted through holes in circuit boards and are then soldered on the other side and dual in-line meaning the device has a rectangular housing with parallel pins on both sides that are pointed downward allowing for through hole soldering to a circuit board. | ||
Line 26: | Line 26: | ||
http://www.computerhistory.org/semiconductor/timeline/1963-TTL.html | http://www.computerhistory.org/semiconductor/timeline/1963-TTL.html | ||
+ | |||
+ | http://www.globalspec.com/reference/3360/Transistor-Transistor-Logic-TTL |
Revision as of 13:00, 11 September 2009
Page created by Kelsey Duncombe-Smith
Transistor-Transistor Logic
TTL, or transistor-transistor logic, is a digital circuit that uses multiple transistors to derive its output.[1] It was first created in 1965.
Overview
The first family of transistors, Sylvania Universal High-level Logic (SUHL), was produced in 1963. TTL is most often used with integrated circuitry. TTL first became popular with designers after Texas Instruments released the 5400 series which had a military grade temperature range, allowing the integrated circuits to work in hot or cold climates. [2] In transistor-transistor logic, transistors can both amplify the output and isolate the inputs; a step up from the previous resistor-transistor logic and diode-transistor logic. TTL is bipolar logic, meaning it contains at least one BJT, or a bipolar junction transistor, which contributes to the amplifying power of transistor-transistor logic. TTL circuits also include diodes and resistors. TTL circuits are often used to send a low or high signal using a 5V power supply, a low signal being between 0V and .8V and a high signal being between 2V and 5V.
TTL devices were packaged in through-hole, dual in-line packages. Through-hole meaning devices that have pins that are inserted through holes in circuit boards and are then soldered on the other side and dual in-line meaning the device has a rectangular housing with parallel pins on both sides that are pointed downward allowing for through hole soldering to a circuit board.
Significance
The low cost of transistors made digital techniques using transistor-transistor logic more economically practical. Also, previously analog tasks switched to digital like how TV switched from analog to digital recently.
References
Links
http://en.wikipedia.org/wiki/Transistor–transistor_logic
http://www.computerhistory.org/semiconductor/timeline/1963-TTL.html
http://www.globalspec.com/reference/3360/Transistor-Transistor-Logic-TTL