What is the logic family of the 74 Series devices?

What is the logic family of the 74 Series devices?

The 74LS (Low-power Schottky) family (like the original) uses TTL (Transistor-Transistor Logic) circuitry which is fast but requires more power than later families. The 74 series is often still called the ‘TTL series’ even though the latest ICs do not use TTL!

What is temperature range of 74 series of TTL families?

74 Series Device Identification 74 − Commercial grade, IC plastic package with temperature range of 0°C to +70°C although some sub families have an extended range of − 40°C to +125°C.

Which digital logic family has better performance?

Unipolar Logic Families: It mainly uses Unipolar devices like MOSFETs in addition to passive elements like resistors and capacitors. These logic families have the advantages of high speed and lower power consumption than Bipolar families.

What is TTL family?

Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function (the first “transistor”) and the amplifying function (the second “transistor”), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL).

Why 74LS devices are better than 74 devices?

The 74S family, using Schottky circuitry, uses more power than the 74, but is faster. The 74LS family of ICs is a lower-power version of the 74S family, with slightly higher speed but lower power dissipation than the original 74 family; it became the most popular variant once it was widely available.

Why NAND & NOR gates are called universal gates?

Answer: The NAND & NOR gates are called universal gates because they perform all the logical operations of basis gates like AND, OR, NOT. Answer: NOR AS AND An AND gate gives a 1 output when both inputs are 1; a NOR gate gives a 1 output only when both inputs are 0.

Which logic family is the fastest one?

Emitter-coupled logic (ECL) is a BJT-based logic family which is generally considered as the fastest logic available.

Why does IC start with 74?

The series 74 was a designation for commercial grade TTL (transistor to transistor logic, a family circuit characteristic) and 54 was a designation for military temperature of the same design. The family had more or less matched speeds, and drive levels called TTL loads.

What is bipolar logic families?

Bipolar logic families are classified as belonging to either saturated or non-saturated logic families. In saturated logic, the transistor is switched between the off and saturation regions, while in non-saturated logic, the transistor is switched between the off and active regions.

What is TTL logic family and CMOS family?

The types of logic devices are classified in “families”, of which the most important are TTL and CMOS. The main families are: TTL (Transistor-Transistor Logic), made of bipolar transistors. CMOS (Complementary Metal Oxide Semiconductor) made from MOSFETs. ECL (Emitter Coupled Logic) for extremely high speeds.

How do I identify the logic subfamily of a part?

A few alphabetic characters to designate a specific logic subfamily may immediately follow the 74 or 54 in the part number, e.g., 74LS74 for Low-power Schottky. Some CMOS parts such as 74HCT74 for High-speed CMOS with TTL-compatible input thresholds are functionally similar to the TTL part. Not all functions are available in all families.

What is the difference between the 74HC and the 4000 series?

The 74HC family has High-speed CMOS circuitry, combining the speed of TTL with the very low power consumption of the 4000 series. They are CMOS chips with the same pin arrangements as the older 74LS family.

What does 74ls74 mean in the part number?

A few alphabetic characters to designate a specific logic subfamily may immediately follow the 74 or 54 in the part number, e.g., 74LS74 for Low-power Schottky. Some CMOS parts such as 74HCT74 for High-speed CMOS with TTL-compatible input thresholds are functionally similar to the TTL part.

What are the logic families available in small footprints?

The logic families available in small footprints are: AHC, AHCT, AUC, AUP, AXP, HC, HCT, LVC, VHC, NC7S, NC7ST, NC7SU, NC7SV. The LVC family is very popular in small footprints because it supports the most common logic voltages of 1.8V, 3.3V, 5V, its inputs are 5V tolerant when the device is powered at a lower voltage, and an output drive of 24 mA.