Go to GlobalSpec.com Home
Newsletter   FREE GlobalSpec e-Newsletters
Receive the latest news, trends, and technology relevant to your work.
(See Titles)

Transistor-Transistor Logic (TTL)

 

 

Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors. It is notable, as it was the base for the first widespread semiconductor integrated circuit (IC) technology. All TTL circuits operate with a 5 V power supply. TTL signals are defined as "low" or L when between 0 V and 0.8 V with respect to the ground terminal, and "high" or H when between 2 V and 5 V.

The first logic devices designed from bipolar transistors were referred to as standard TTL. The addition of Schottky diodes to the base collector of bipolar transistor was called Schottky logic (S-TTL). Schottky diodes shorten propagation delays within TTL by preventing the collector from going into what is called 'deep saturation.” Other Transistor-transistor logic technologies include low-power Schottky (LS-TTL), advanced Schottky (AS-TTL), advanced low-power Schottky (ALS-TTL), and low-voltage TTL (LVTTL).

Products & Services
Memory chips are internal storage areas in computers. Although the term “memory chip” commonly refers to a computer's random access memory (RAM), this product area includes many different types of electronic data storage. Computer memory stores data electronically in cells. Without memory chips, a computer could not read programs or retain data. Search by Specification | Learn more about Memory Chips
Complex programmable logic devices (CPLDs) are integrated circuits (ICs) or chips that application designers configure to implement digital hardware such as mobile phones. CPLDs can handle significantly larger designs than simple programmable logic devices (SPLDs), but provide less logic than field programmable gate arrays (FPGAs). Search by Specification | Learn more about Complex Programmable Logic Devices (CPLD)
Dynamic random access memory (DRAM) chips are single-transistor memory cells that use small capacitors to store each bit of memory in an addressable format that consists of rows and columns. Because capacitors are unable to hold a charge indefinitely, DRAM memory chips require a near-constant pulse of current to retain stored information. Search by Specification | Learn more about DRAM Memory Chips
Erasable programmable read-only memory (EPROM) chips are programmable, reusable computer chips that can be erased using ultraviolet light and reprogrammed with a PROM programmer or PROM burner. Search by Specification | Learn more about EPROM
Electrically erasable programmable read-only memory (EEPROM) chips are similar to PROM devices, but require only electricity to be erased. Search by Specification | Learn more about EEPROM
Product Announcements
American Microsemiconductor, Inc. - Bipolar Junction Transistor (BJT)
Bipolar transistors, having 2 junctions, are 3 terminal semiconductor devices. The three terminals of a bipolar transistor are emitter, collector, and base. The transistor can either be a NPN... (read more)
M.S. Kennedy Corp. - 4357 - 28 Amp, 3 Phase Motor Drive Hybrid
The MSK 4357 is a 28 Amp, 3 Phase Bridge Smart Power Motor Drive Hybrid with a 500 volt rating. The output switches are Insulated Gate Bipolar Transistors (IGBT's) tailored for high switching speeds. (read more)
Narda East (a division of L-3 Communications) - XSEM Series, Transfer Switches DC-18 GHz
Stocked Transfer Switches... (read more)
American Microsemiconductor, Inc. - Power RF Transistors - NPN or PNP Bipolar from AMS
NPN or PNP Bipolar RF Transistors. If you have need of VHF Amplifiers (136-210 Mhz), American Microsemiconductor will support MHW607-1, -2, -3, and -4 types used primarily in portable hand held... (read more)
American Microsemiconductor, Inc. - LOOKING FOR A DIODE OR RECTIFIER -CALL AMS FIRST
American Microsemiconductor has been supplying signal diodes and power rectifiers to the Electronic Industry for over 40 years. Take advantage of our experience and expertise and call us with your... (read more)
American Microsemiconductor, Inc. - Junction Field Effect Transistor J-FET from AMS
The J-FET (Junction Field Effect Transistor) is a voltage controlled device: that is a small change in input voltage causes a large change in output current. (read more)
American Microsemiconductor, Inc. - Bridge Rectifier, Single & Three Phase Rectifiers
AMERICAN MICROSEMICONDUCTOR supplies a wide range of bridges,both single phase and three phase. Bridges are mainly used to rectify ac to dc. We supply bridges at voltages from 50 Volts to 5kV and in... (read more)
 
Topics of Interest
Fairchild advanced Schottky TTL (FAST) technology was created in late 1970 when advances in IC technology allowed the speed and drive of S-TTL to be combined with the lower power of LS-TTL to form a... (Read More)
BiCMOS is a silicon-germanium (SiGe), bipolar semiconductor technology that combines the high speed of bipolar TTL with the low power-consumption of CMOS. Transistor-transistor logic (TTL) and... (Read More)
There are several low-voltage CMOS technologies: standard low-voltage (LV), low-voltage high-performance HCMOS (LVC), low-voltage CMOS technology with transistor-transistor logic (TTL) inputs (LVT),... (Read More)
Schottky diodes, based on silicon or gallium arsenide substrates, are used in many receiver and transmitter circuits for mixing and detecting at frequencies up to 100 GHz. Today, advanced wafer and... (Read More)
Access Time: Time between the memory receiving a new input address and the output data s becoming available in a read operation. Active Load: A transistor that acts as a load for another transistor. (Read More)
See more product announcements for Memory Chips
Plug-and-Play Crypto Chip for Host-Side Security

Plug-and-Play Crypto Chip for Host-Side Security
Atmel Corporation


CryptoMemory® - Secure Memory

CryptoMemory® - Secure Memory
Atmel Corporation


DRAM

DRAM
Kendu International Inc.


11 See more product announcements for Memory Chips