What is logic family in digital electronics?
In computer engineering, a logic family is one of two related concepts: A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family.
What are the logic family?
The logic families which fall under the first kind are called bipolar families, this include diode logic (DL), emitted coupled logic (ECL), resistor transistor logic (RTL), diode transistor logic (DTL), transistor transistor logic (TTL).
How many types of logic families are there?
Four major logic families that predominated from the 1970’s through the 1990’s are Transistor-Transistor Logic (TTL), Complementary Metal-Oxide-Semiconductor Logic (CMOS, pronounced sea-moss), Low Voltage TTL Logic (LVTTL), and Low Voltage CMOS Logic (LVCMOS). Their logic levels are compared in Table 1.4.
What are the characteristics of logic family?
The main characteristics of Logic families include:
- Speed.
- Fan-in.
- Fan-out.
- Noise Immunity.
- Power Dissipation.
What is the difference between the CMOS and TTL logic families?
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.
Which was the first logic family?
The first, and oldest, family is TTL. TTL stands for ‘transistor-transistor logic’, this logic family having replaced the older (now obsolete) DTL—diode-transistor logic. The second logic family is CMOS (pronounced ‘sea-moss’) which stands for ‘complementary metal oxide semiconductor’.
What is digital logic family classify?
Digital logic family is a group of logic gates constructed using passive devices like a resistor, transistor, diodes, etc. Such devices have compatible logic levels and supply voltage with certain characteristics.
What are DTL gates?
Diode-Transistor Logic, or DTL, refers to the technology for designing and fabricating digital circuits wherein logic gates employ both diodes and transistors.
What is TTL and ECL?
TTL (Transistor Transistor Logic) IC technology uses bipolar transistor as principal circuit element. CMOS (Complementary Metal Oxide Semiconductor) IC technology uses FET as principal circuit element. ECL (Emitter Coupled Logic) IC technology uses bipolar transistors configured as differential amplifier.
What are 2 major types of logic circuit components?
There are two basic types of logic circuitry: combinational circuitry and state circuitry.
- Combinational circuitry behaves like a simple function. The output of combinational circuitry depends only on the current values of its input.
- State circuitry behaves more like an object method.