logic families
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This document discusses different logic families used in digital integrated circuits. It describes bipolar families like Resistor Transistor Logic (RTL), Diode Transistor Logic (DTL), and Transistor-Transistor Logic (TTL). TTL is the most widely used family and is built from bipolar junction transistors and resistors. Emitter Coupled Logic (ECL) is also discussed as a high-speed bipolar family. Metal-Oxide Semiconductor (MOS) families include PMOS, NMOS, and CMOS. CMOS uses complementary pairs of P-channel and N-channel MOSFETs and has advantages like low power, high density, and noise immunity. The document
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Logic families
TTL and CMOS are the two main logic families. TTL uses bipolar transistors and was previously dominant, while CMOS now dominates due to its lower power consumption. TTL provides high speed but uses more power, while CMOS is slower but more power efficient. Both have evolved over time with different sub-families for various applications.
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The fanout of a 74LS00 NAND gate is around 10-15.
The 74LS00 data sheet typically specifies a maximum high output current (IOH) of 0.4 mA and a maximum low output current (IOL) of 8 mA.
Since the typical input current required by a 74LS00 gate is around 0.2-0.4 mA, one 74LS00 output can reliably drive around 10-15 74LS00 inputs before the output current capability is exceeded.
So in summary, a single 74LS00 NAND gate output can drive approximately 10-15 other 74LS00 gate inputs according to the typical specifications.
logic family
This document discusses various digital integrated circuit logic families including RTL, DTL, TTL, ECL, MOS, and CMOS. It covers key characteristics such as fan-out, power dissipation, propagation delay, and noise margin. TTL is described as having several subfamilies or series with different output configurations like open-collector, totem-pole, or three-state outputs. ECL is introduced as a non-saturated logic family with very fast propagation rates below 2ns but also the worst noise immunity and power dissipation of all families.
digital logic_families
Digital logic families classify integrated circuits by their circuit technology. A logic family consists of chips that perform logic functions like AND and OR with similar input/output characteristics. Popular families include TTL, ECL, MOS, and CMOS. CMOS uses fewer transistors than other families for inversion and is known for low power. Logic levels and noise margins define input and output voltage thresholds. Transition times and capacitive loading affect a circuit's propagation delay.
Logic families
This document discusses different logic families including Resistor Transistor Logic (RTL), Diode Transistor Logic (DTL), Transistor-Transistor Logic (TTL), and Emitter Coupled Logic (ECL). It provides circuit diagrams and explanations of the working principles for each logic family. Key characteristics like fan-in, fan-out, propagation delay, noise immunity, and power dissipation are compared for each logic family.
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Logic Families ( Digital Electronics )
Logic Family Definition A circuit configuration or approach used to produce a type of digital integrated circuit.
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Logic families
TTL and CMOS are the two main logic families. TTL uses bipolar transistors and was previously dominant, while CMOS now dominates due to its lower power consumption. TTL provides high speed but uses more power, while CMOS is slower but more power efficient. Both have evolved over time with different sub-families for various applications.
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The fanout of a 74LS00 NAND gate is around 10-15.
The 74LS00 data sheet typically specifies a maximum high output current (IOH) of 0.4 mA and a maximum low output current (IOL) of 8 mA.
Since the typical input current required by a 74LS00 gate is around 0.2-0.4 mA, one 74LS00 output can reliably drive around 10-15 74LS00 inputs before the output current capability is exceeded.
So in summary, a single 74LS00 NAND gate output can drive approximately 10-15 other 74LS00 gate inputs according to the typical specifications.
logic family
This document discusses various digital integrated circuit logic families including RTL, DTL, TTL, ECL, MOS, and CMOS. It covers key characteristics such as fan-out, power dissipation, propagation delay, and noise margin. TTL is described as having several subfamilies or series with different output configurations like open-collector, totem-pole, or three-state outputs. ECL is introduced as a non-saturated logic family with very fast propagation rates below 2ns but also the worst noise immunity and power dissipation of all families.
digital logic_families
Digital logic families classify integrated circuits by their circuit technology. A logic family consists of chips that perform logic functions like AND and OR with similar input/output characteristics. Popular families include TTL, ECL, MOS, and CMOS. CMOS uses fewer transistors than other families for inversion and is known for low power. Logic levels and noise margins define input and output voltage thresholds. Transition times and capacitive loading affect a circuit's propagation delay.
Logic families
This document discusses different logic families including Resistor Transistor Logic (RTL), Diode Transistor Logic (DTL), Transistor-Transistor Logic (TTL), and Emitter Coupled Logic (ECL). It provides circuit diagrams and explanations of the working principles for each logic family. Key characteristics like fan-in, fan-out, propagation delay, noise immunity, and power dissipation are compared for each logic family.
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Logic family
Power point presentation on logical families.
A good presentation cover all topics.
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IN COMPUTER ENGINEERING, A LOGIC FAMILY MAY REFER TO ONE OF TWO RELATED CONCEPTS. A "LOGIC FAMILY" MAY ALSO REFER TO A SET OF TECHNIQUES USED TO IMPLEMENT LOGIC WITHIN VLSI INTEGRATED CIRCUITS SUCH AS CENTRAL PROCESSORS, MEMORIES, OR OTHER COMPLEX FUNCTIONS. THE MOST COMMON LOGIC FAMILY IN MODERN SEMICONDUCTOR DEVICES IS METAL–OXIDE–SEMICONDUCTOR (MOS) LOGIC, DUE TO LOW POWER CONSUMPTION, SMALL TRANSISTOR SIZES, AND HIGH TRANSISTOR DENSITY.
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Impact of Hybrid Pass-Transistor Logic (HPTL) on Power, Delay and Area in VL...
Abstract: Power reduction is a serious concern now days. As the MOS devices are wide spread, there is
high need for circuits which consume less power, mainly for portable devices which run on batteries, like
Laptops and hand-held computers. The Pass-Transistor Logic (PTL) is a better way to implement circuits
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This document discusses the impact of hybrid pass-transistor logic (HPTL) on power, delay, and area in VLSI design. It first describes how PTL can help reduce power consumption through reducing switching activity, capacitance, voltage, and short-circuit current. It then outlines the implementation of a 32x32 bit multiplier using PTL, CMOS, and a new transmission gate-based design. Simulation results show the PTL design has lower power consumption and area overhead compared to CMOS, with reasonable delays. Finally, a new conditional enhancement scheme for PTL flip-flops is proposed to further reduce transistors, speed up pulsing, decrease delay, and lower power consumption.
Doering
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logic families
- 1. Logic families Classification Koshys institute of management studies Bangalore
- 2. Logic families Ic technology changes from time to time. The technology depends on following factors Speed Power dissipation Noise immunity Input/output interface compatibility Cost
- 3. Desirable qualities High speed Low power dissipation High noise immunity Single output to be obtained from many i/p. Compatibility : connecting the output of one device to input of other. Interfacing: design of interconnection between circuits that shift the voltage levels and current levels to make them compatible.
- 4. Classification of digital Ic families Digital IC classified as Bipolar families MOSFET families Resistor transistor logic(RTL) PMOS Pchannel Diode transistor logic(DTL) NMOS Nchannel Transistor transistor logic (TTL) Complementary MOS Emitter coupled logic (ECL)
- 5. TTL TTL is most popular of ssi and msi. TTl Uses diodes and transistors for basic NAND gates this technology is called DTL Diodes were replaced by transistor to improve the circuit operation and this logic family was called TTL. Built from bipolar junction transistors and resistors . It is called TTL because both logic gating function and amplifying function is performed by transistors.
- 6. TTL APPLICATIONS Most widely used logic family In computers Industrial controls Test equipment's Consumer electronics Military and aerospace. Ttl is an ex of SSI & LSI
- 7. Variation in ttl Standard ttl High speed ttl Low power Schotty low powerSchottky Advanced Schottky Low voltage ttlSchottky
- 8. ECL Also called as current mode logic Obtained through bipolar transistor that compute logical functions. CHARACTERISTICS/ advantages Change state rapidly thus operate at high speed. Fastest of logic family since propagation time is less than nano seconds. Does not depend on state of the circuit. Little power noise is generated.
- 9. Disadvantage ,Usage-Ecl Transistor draw current continuously Circuit requires more power and wastage is more. Power requirements: TTl- 5 volts Ecl – (-5.2v)negative power supplies. USAGE When high performance is required, high speed application. Older version of Main frame computers. Super computers and signal processors.
- 11. MOS Unipolar transistor depends on only one type of carrier. Carrier may be electrons or holes. Used in Lsi & vlsi Metal electrode is placed on top of oxide insulator ie the semiconductor material. Mosfet is used where power consumption is low.
- 12. PMOS,NMOS,CMOS P channel mos is referred as pmos. P oldest and slowest obsolete. Nmos n channel and used in circuits with one type of MOS transistor. Nmos used in microprocessor and memories. CMOS combination n and p channel. Cmos is also explained as “Complementary – Symmetry”. Cmos uses Symmetrical pairs of electronic devices p type and n type.
- 13. Characteristics of Cmos High input resistance. Compatible output of one device can be connected to another CMOS. High noise immunity Low static power High density on chip Simple Protection circuitry Absorb electric charges with no damage.
- 14. Usage Cmos Microcontrollers, microprocessor, RAM Image sensors, data converter and integrated transceivers and other types of communication. Current IBM mainframes . Digital wristwatches, calculators and portable computers. ADVANTAGE Dissipate less power . Operates on high speed. Low cost More economical operation
- 15. Disadvantage Power consumption increases with clock speed. Higher noise COMPARISONS TTL,ECL,CMOS Ttl Ecl Cmos Power consumption increase with clock speed Power consumption is high Power consumption does not increase Less sensitive elecrostatic discharge More sensitive electrostatic discharge Nand gate Nor gate Not gate