Who invented TTL?
Patented by James Buie of Pacific Semiconductor in 1961, TTL (Transistor Transistor Logic) emerged as the most popular logic configuration of the next two decades.
What does IC 74 mean?
Two digits, where “74” denotes a commercial temperature range device and “54” denotes a military temperature range. Historically, “64” denoted a short-lived series with an intermediate “industrial” temperature range.
What is the history of logic gate?
History and development In an 1886 letter, Charles Sanders Peirce described how logical operations could be carried out by electrical switching circuits. Eventually, vacuum tubes replaced relays for logic operations. Lee De Forest’s modification, in 1907, of the Fleming valve can be used as a logic gate.
What is a 7400?
The Remington Model 7400 is a series of semi-automatic rifles manufactured by Remington Arms. The Model 7400 was a replacement of the Model 740 rifle which Remington produced from 1952 to 1981. The 7400 model was ultimately replaced by the Model 750 in 2006.
What is meant by TTL?
Time-to-live (TTL) is a value for the period of time that a packet, or data, should exist on a computer or network before being discarded. The meaning of TTL, or packet lifetime, depends on the context.
What is 74HCT?
The 74HCT family of logic devices are high speed, low power devices that use CMOS circuitry. The devices are pin compatible with many existing devices such as the 74TTL, 74STTL, 4000 series and the 74LS family. 4.5V to 5.5V operation. Very high impedance inputs.
What is 74LS?
A standard set of subcircuits is provided with the logic simulator for designing logic circuits using standard TTL chips. The TTL family of integrated circuits was introduced about 20 years ago by Texas Instruments.
What is importance of logic gate?
Logic gates are an important concept if you are studying electronics. These are important digital devices that are mainly based on the Boolean function. Logic gates are used to carry out logical operations on single or multiple binary inputs and give one binary output.
Where is IC 7400 used?
7400 IC is the most widely used TTL (Transistor-Transistor Logic) device in the world. It contains four independent two-input NAND gates. Its popularity is based on the fact that any logic gate function can be created using only NAND gates.
How do you write 7400?
7400 in words is written as Seven Thousand Four hundred.
What is difference TTL and CMOS?
CMOS stands for Complimentary Metal-oxide Semicodictor while in TTL stand for Transistor-Transistor Logic. CMOS circuit uses a field-effect transistor by connecting NMOS and PMOS, the TTL circuit uses bipolar junction transistor. The design of the CMOS can be considered to be very simpler as compared to the TTL.
What is CMOS family?
CMOS logic family is a group of logic circuits, built with complementary MOS devices. All the logic gates that are built with MOSFET devices will come under MOS logic family. MOS Logic family can be classified into three categories.
What is CMOS voltage?
CMOS gate circuits have input and output signal specifications that are quite different from TTL. For a CMOS gate operating at a power supply voltage of 5 volts, the acceptable input signal voltages range from 0 volts to 1.5 volts for a “low” logic state, and 3.5 volts to 5 volts for a “high” logic state.
What is the difference between 74HC and 74HCT?
The difference between 74HC and 74HCT is the input circuitry. The outputs of both series can drive LSTTL or CMOS, but the 74HCT inputs have TTL level compatible tresholds.
What is HCT family?
INTRODUCTION. The 74HC/HCT/HCU high-speed Si-gate CMOS logic family combines the low power advantages of the HE4000B family with the high speed and drive capability of the low power Schottky TTL (LSTTL). The family will have the same pin-out as the 74 series and provide the same circuit functions.
What are the 3 basic logic gates?
All digital systems can be constructed by only three basic logic gates. These basic gates are called the AND gate, the OR gate, and the NOT gate. Some textbooks also include the NAND gate, the NOR gate and the EOR gate as the members of the family of basic logic gates.