What is TTL or gate?
What is TTL or gate?
Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL logic gate s are typically fabricated onto a single integrated circuit (IC). A TTL device employs transistor s with multiple emitters in gates having more than one input.
Is the basic gate in TTL family?
The Transistor-Transistor Logic (TTL) is a logic family made up of BJTs (bipolar junction transistors). The best examples of TTL are logic gates namely the 7402 NOR Gate & the 7400 NAND gate. TTL logic includes several transistors that have several emitters as well as several inputs.
Which is the basic gate of TTL?
NAND gate
Basic TTL Logic Gates This simplified NAND gate circuit consists of an input transistor, TR1 which has two (or more) emitter terminals and a single stage inverting NPN switching transistor circuit of TR2.
What is the equivalent of floating input of TTL or gate?
An unconnected input to a gate is called a floating input, because it floats at the threshold voltage for the device. A floating TTL input usually acts as a HIGH input. However, open inputs are susceptible to noise which can be received by an input via the package leads, which act as antennae for noise.
Which gate consumes less power?
Even though the energy consumed by a single CMOS logic gate to change state has fallen exponentially, the overall power consumption of the chip is still increasing….Low Power Universal Gates for Approximate Computing.
| Logic Function | Dynamic Power (W) | Leakage Power (W) |
|---|---|---|
| Static CMOS NAND | 3.03 e-09 | 0.291 e-10 |
| Proposed Approximate NAND | 2.74 e-09 | 0.172 e-10 |
How does a TTL NAND gate work?
A TTL NAND gate logic circuit has at least four bi polar junction transistors in which the input (transistor which receives input) has two emitters. The output is taken between the emitter and collector of two different transistors.
What is a floating input and what does it act like?
If unconnected inputs (floating inputs),are left floating then it may become overheated and destroy itself. Thus all the inputs of an IC must be connected to either HIGH or LOW input or OUTPUT of another IC. If floating IC will be left , it will pickup elctromagnetic noise voltages and fluctuate .
Why is TTL used?
Time to live (TTL) or hop limit is a mechanism which limits the lifespan or lifetime of data in a computer or network. In computer networking, TTL prevents a data packet from circulating indefinitely. In computing applications, TTL is commonly used to improve the performance and manage the caching of data.
What kind of gates are used in TTL devices?
Most of these devices have drastically different speed and power requirements, requiring gates of different logic familes to realize their architectures. TTL (transistor-transistor logic) and CMOS (complementary-metal-oxide-semiconductor) are two logic familes that are widely in use today.
How to create an OR gate in TTL nor?
An OR gate may be created by adding an inverter stage to the output of the TTL NOR gate circuit. An OR gate may be created by adding an inverter stage to the output of the TTL NOR gate circuit. Skip to content Pages About Contact Disclaimer Copyright Subscribe Submit Articles Forum Helping Hand Part Time Job Learn PLC Game Donate Inst Tools
Why is the output of a TTL gate called a totem pole?
For instance, examine this TTL inverter gate circuit, connected to a load: The output circuitry of this particular gate is commonly referred to as “totem-pole,” because the two output transistors are stacked one above the other like figures on a totem pole.
What are the advantages of RTL and DL gates?
This combination provides clean output signals and either inversion or non-inversion as needed. RTL gates are almost as simple as DL gates, and remain inexpensive. They also are handy because both normal and inverted signals are often available. However, they do draw a significant amount of current from the power supply for each gate.
What is TTL or gate? Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL logic gate s are typically fabricated onto a single integrated circuit (IC). A TTL device employs transistor s with multiple emitters in gates having more than one input. Is the basic…