Digital Electronics - TTL (Transistor Transistor Logic)
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Transistor-transistor logic (TTL) was first developed in 1965 using only transistors to perform logic operations. TTL integrated circuits were improved over the years and are still used today as "glue logic" to connect more complex digital devices. A basic TTL NAND gate uses transistors at the input where both low inputs forward bias the bases, resulting in a high output. The totem-pole output stage arrangement stacks three output components - a transistor, another transistor, and a diode - so that only one conducts at a time.
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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.
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The document discusses transistor-transistor logic (TTL) NAND gates. It begins with an introduction to the topic and outlines what will be covered. It then shows the basic TTL NAND circuit and symbol. The document simulates the circuit in PSpice under different input conditions and discusses the results. It also examines the propagation delay and switching times. In conclusion, it states that TTL NAND gates were discussed and confirms the circuit behaves as expected. It notes additional topics that could be covered if there was more time.
Digital integrated circuits
Monolithic IC technology–planar process–Bipolar junction transistor–FET fabrication–
CMOS technology. DIGITAL IC's. Logic families; DTL, HTL, RTL, TTL, ECL, PMOS, CMOS, I2L performance criteria -Comparison, applications, advantages.
digitalelectronicslogicfamilies-190628101225-converted.pptx
This document discusses different types of digital logic families. It describes Transistor-Transistor Logic (TTL) circuits, including TTL NAND gates which use a totem pole configuration to provide high speed and low output impedance. Metal-oxide-semiconductor (MOS) and complementary MOS (CMOS) circuits are also covered, with CMOS NAND gates using both N-channel and P-channel MOSFETs for low power dissipation. Emitter-coupled logic (ECL) is described as the fastest logic family using current-mode switching, though it has higher power dissipation. Key specifications for digital ICs like propagation delay, power, noise immunity, and fan-in
UNIT 3.pptx
TTL logic gate characteristics. Theory & operation of TTL NAND gate circuitry. Open collector TTL. Three state output logic. TTL subfamilies. MOS& CMOS logic families. Realization of logic gates in RTL, DTL, ECL, C-MOS & MOSFET.
Digital logic families
This document discusses different digital logic families and characteristics. It describes Resistor-Transistor Logic (RTL) which consists of resistors and transistors, with the emitters connected to ground and collectors tied through a resistor. Transistor-Transistor Logic (TTL) is also discussed, which depends solely on transistors. TTL uses multiple emitter transistors for inputs and a totem-pole output for high speed and low impedance. The document provides details on RTL and TTL gate operations.
Logic families(unit 4)
This document provides an overview of logic families. It discusses different logic families including TTL, IIL, ECL, NMOS, and CMOS. It covers characteristics of logic gates such as fan-in, fan-out, noise margin, propagation delay, and input and output characteristics. It also discusses diodes, BJTs, and MOSFETs as switching elements. The document compares various logic families in terms of packing density, power consumption, and gate delay. Additionally, it covers topics such as open collector output, interfacing between logic families, and tri-state logic.
Chapter 3.pptx
This course presents an introductory discussion about what digital logic gates are; and how they are constructed from basic electrical devices.
Lec 4 digital electronics - interated circuit technology -characteristics o...
This document discusses the characteristics of integrated circuits (ICs). It describes the two main types of semiconductor devices that ICs are based on, bipolar and unipolar devices, and how various digital logic functions have been implemented using these technologies. It then discusses several key characteristics used to evaluate and compare the performance of different digital IC technologies, including speed of operation, power dissipation, noise immunity, propagation delay, loading and fan-out.
direct coupled transistor logic
Direct Coupled Transistor Logic (DCTL) is a type of logic circuit that is similar to Resistor-Transistor Logic (RTL) but connects the transistor bases directly to the collector outputs without base resistors. DCTL gates have fewer components, are more economical, and simpler to fabricate than RTL gates. DCTL can implement basic logic gates like NOR and NAND. It has advantages of low power dissipation and ability to operate using a single low voltage supply but has limitations related to increased base current and lower output voltage levels. DCTL finds real-life uses in applications requiring high speed and low power like large computers and digital watches.
Unit 5 session 4
This document summarizes three logic families: RTL, TTL, and ECL. RTL uses resistors and transistors in a NOR configuration with each input associated with one resistor and transistor. TTL uses transistors in a NAND configuration and features a totem-pole output stage for increased speed and output capability. ECL is a non-saturated logic family that provides OR and NOR functions with each input connected to a transistor base. It features very low propagation delay and operates with negative voltage supplies.
Unit 5 session 4
This document summarizes three logic families: RTL, TTL, and ECL. RTL uses resistors and transistors in a NOR configuration with each input associated with one resistor and transistor. TTL uses transistors in a NAND configuration and features a totem-pole output stage for increased speed and output capability. ECL is a non-saturated logic family that provides OR and NOR functions with each input connected to a transistor base. It features very low propagation delay and operates with negative voltage supplies.
Unit5 session 5
This document discusses the characteristics and circuitry of transistor-transistor logic (TTL) and emitter-coupled logic (ECL) families. It describes that TTL uses a totem-pole output configuration with NAND gates as the basic circuit. ECL is a non-saturated current mode logic with limited voltage swing and OR/NOR outputs. The document outlines advantages such as high speed and low output impedance for ECL, but also disadvantages like high cost and power consumption. Circuit diagrams and explanations of the OR/NOR gate operation in ECL are provided.
Automatic Room Lock And Lights Off Circuit
This circuit automatically controls room lights and locks based on the number of people in the room. It uses 555 timers, a 74LS192 decade counter, 74LS47 7-segment display driver, and HEF4002B 4-input NOR gate. The counter tracks the number of people and displays it. When someone enters, it increases the count and turns on the lights. When empty, it turns off the lights. The NOR gate controls the relay for locking/unlocking the door based on the people count. It can be useful for monitoring room capacity and conserving energy by automatically turning lights off. Future improvements could include remote monitoring and voice alerts.
7833177.ppt
This document discusses different types of digital integrated circuits (ICs) including logic families. It describes transistor logic families like resistor-transistor logic (RTL), resistor-capacitor transistor logic (RCTL), diode-transistor logic (DTL), high threshold logic (HTL), and transistor-transistor logic (TTL). It also discusses metal-oxide semiconductor (MOS) logic families like PMOS, NMOS, and complementary MOS (CMOS) as well as bipolar logic families like emitter-coupled logic (ECL). The document explains the characteristics and workings of these different logic families.
Mach dien cong mos
CMOS logic circuits use complementary NMOS and PMOS transistors. The inverter is the simplest CMOS circuit, using an NMOS and PMOS transistor with connected gates and drains to pull the output high or low depending on the input. More complex gates like NAND, NOR, and XOR can be constructed from combinations of inverters and transmission gates. SRAM memory cells use two cross-coupled inverters to store a bit and word and bit lines to read and write data.
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Digital Electronics - TTL (Transistor Transistor Logic)
- 1. TRANSISTOR TRANSISTOR LOGIC(TTL) Submitted By Yogendra Yaduwanshi
- 2. 7400 TTL Series o TTL ICs first developed in 1965 and they are known as “standard TTL” . This version of TTL circuit is not available now. o TTL family use only transistor to perform the basic logic operations. o The standard TTL is improved to a great extent over the year. o TTL devices are still used as “glue” logic which connects more complex devices in digital system.
- 3. Two Input TTL-NAND Gate The first, let us replace transistor Q1 by its equivalent circuits. A and B are the input terminals. The i/p voltage A and B can be either low (zero volts ideally) or High (+Vcc ideally). A and B both low : If A and B both are connected to ground, then both the B-E junction of the transistor Q1 are forward biased.
- 4. Totem – pole Output Stage of TTL The arrangement of Q3 and Q4 on the output side of a TTL NAND gate is called the totem-pole arrangement. In this circuit, the three output component Q3,Q4 and diode D1 are stacked one on the top of the other in the form of totem-pole. At any time, only one of them will be conducting.
Editor's Notes
- THANKS