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Introduction to Fairchild Advanced Schottky TTL
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Today, we'll explore the Fairchild Advanced Schottky TTL family, commonly known as FAST logic. Can anyone remind me what TTL stands for?
Transistor-Transistor Logic!
Exactly! And FAST logic evokes a sense of speed and efficiency. The 74F family is designed for high-performance applications. What do you think might be a key feature of this family?
Maybe it has lower power consumption?
Great thought! In fact, it combines speed and power efficiency, which we will discuss in more detail.
Characteristic Features
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Let's delve into the specific features of the Fairchild Advanced Schottky TTL family. What do you think are the important voltage levels in TTL logic?
I think logic HIGH and LOW have specific voltage thresholds?
That's correct! We use 2V for logic HIGH and 0.8V for logic LOW. This family also has specific input and output currents. Can anyone name those?
Isnβt the input current 20ΞΌA?
Right! And the output currents are 20mA for high output and 1mA for low output. This ensures that they can drive a load effectively.
Propagation and Power Efficiency
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Next, letβs talk about propagation delays. What are the propagation delays for the Fairchild Advanced Schottky TTL family?
Is it something around 5.3ns and 6ns for LOW-to-HIGH and HIGH-to-LOW transitions?
Exactly! Fast propagation delays are crucial for high-speed applications. Now, how does this relate to power efficiency?
Am I correct in saying that speed reduces power consumption?
Yes! The speed-to-power product is minimized to 10pJ, making it efficient for performance-critical tasks. This is a significant advancement in digital design.
Operating Temperature and Conclusion
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Lastly, letβs cover the operating temperature ranges for both series: 74F and 54F. What do you think are those ranges?
I believe the 74F works from 0Β°C to 70Β°C and the 54F from -55Β°C to +125Β°C.
Perfect! These ranges allow the advanced TTL family to operate reliably in a variety of conditions. Can anyone summarize the key advantages we discussed today?
We have fast propagation delays, efficient power consumption, and a wide operating temperature range!
Excellent summary! Remember, the Fairchild Advanced Schottky TTL family is designed for high-speed, power-efficient digital applications.
Introduction & Overview
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Quick Overview
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This section examines the Fairchild Advanced Schottky TTL family, highlighting its key features, such as improved speed and power efficiency. The characteristics of this family, including propagation delay and operating conditions, are thoroughly summarized.
Detailed
Fairchild Advanced Schottky TTL (74F/54F)
The Fairchild Advanced Schottky TTL family, commonly referred to as FAST logic, is an innovative extension of the Advanced Schottky TTL (AS-TTL). This family is designed to provide significant enhancements in both speed and power efficiency. The principal characteristics of the 74F series, which operates at a supply voltage range of 4.75V to 5.25V, and the 54F series, which operates at a range of 4.5V to 5.5V, are crucial for understanding its capabilities.
Key features summarized in this section include:
- Input and Output Characteristics: The voltage levels defining logic HIGH and LOW are pegged at 2V and 0.8V, respectively, with an input current of 20ΞΌA and output currents for high and low outputs at 20mA and 1mA. The noise margin is consistently set at 0.3V, ensuring effective operation under varying conditions.
- Propagation Delays: The family exhibits fast propagation delays of 5.3ns for LOW-to-HIGH transitions and 6ns for HIGH-to-LOW transitions under specified load conditions, making it suitable for high-frequency applications.
- Power Consumption: Remarkably, the speed-to-power product is minimized to 10pJ while maintaining a max flip-flop toggle frequency of 125 MHz, supporting performance-critical digital applications.
- Temperature Range: Appropriate operating temperature ranges are outlined, with the 74F-series operating from 0Β°C to 70Β°C and the 54F-series functioning in a broader range from -55Β°C to +125Β°C.
In summary, the Fairchild Advanced Schottky TTL family represents a robust choice for digital design, balancing speed, power, and reliability.
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Introduction to Fairchild Advanced Schottky TTL
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The Fairchild Advanced Schottky TTL family, commonly known as FAST logic, is similar to the AS-TTL family. Figure 5.23 shows the internal schematic of a Fairchild Advanced Schottky TTL NAND gate. The circuit shown is that of one of the four gates inside a quad two-input NAND (type 74F00 or 54F00).
Detailed Explanation
The Fairchild Advanced Schottky TTL family, referred to as FAST logic, is designed to offer improved performance over previous TTL families, particularly in terms of speed. The internal workings of the 74F00 NAND gate, for example, utilize an emitter follower configuration, which ensures a strong base drive to the output transistors. This setup allows for faster operation and is an advancement in the TTL logic family.
Examples & Analogies
Think of the FAST logic as a high-performance sports car compared to an older model. Just as the sports car has advanced features that make it faster and more efficient, the Fairchild Advanced Schottky TTL offers improvements that enhance the speed and performance of digital circuits.
Circuit Configuration and Functionality
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The DTL kind of input with emitter follower configuration of Q1 provides a good base drive to Q2. The βMiller killerβ configuration comprising varactor diode D3, transistor Q7, and associated components speeds up LOW-to-HIGH transition. During LOW-to-HIGH transition, voltage at the emitter terminal of Q3 begins to rise while Q7 is still conducting. Varactor diode D3 conducts, thus supplying base current to Q6. A conducting Q6 provides a discharge path for the charge stored in the base-collector capacitance of Q5, thus expediting its turn-off.
Detailed Explanation
In this advanced TTL architecture, the circuit employs a configuration known as 'Miller killer' to enhance the switching speed. When transitioning from LOW to HIGH, certain transistors work together to ensure that the signal rises quickly and efficiently. This method includes components like varactor diodes, which allow for quick response times, making the logic gate much faster than traditional configurations.
Examples & Analogies
Imagine a digital light switch that, when flipped, instantly turns the light on without flickering. This is similar to how the FAST logic works, ensuring that the transitions between LOW and HIGH states occur without delays, much like that instant illumination.
Characteristic Features of 74F/54F Family
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Characteristic features of this family are summarized as follows: V = 2V; V = 0.8V; I = 20ΞΌA; I = 0.6mA; V = 2.7V; V = 0.5V; I = 1mA; I = 20mA; V = 4.75β5.25V (74F) and 4.5β5.5V (54F); propagation delay (a load resistance of 500Ξ©, a load capacitance of 50pF and full operating voltage and temperature ranges)=5.3ns/7ns (max.) for LOW-to-HIGH and 6ns/6.5ns (max.) for HIGH-to-LOW output transitions; worst-case noise margin=0.3V; fan-out=40; I (for all four gates)=2.8mA; I (for all four gates)=10.2mA; operating temperature range=0β70Β°C (74F-series) and -55 to +125Β°C (54F-series); speedβpower product=10pJ; maximum flip-flop toggle frequency=125MHz.
Detailed Explanation
The Fairchild Advanced Schottky TTL offers a range of specifications that highlight its performance capabilities. Significant features include a very low propagation delay, which means it can switch states quickly and is capable of handling considerable fan-out. This means multiple outputs can be driven with minimal impact on performance, making it versatile for various applications, especially in high-speed digital circuits.
Examples & Analogies
Think of this family as a high-speed internet connection that allows multiple devices to stream videos simultaneously without buffering. Similarly, the FAST TTL family can handle multiple signals efficiently without slowing down, making it ideal for complex digital systems.
Definitions & Key Concepts
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Key Concepts
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Fairchild Advanced Schottky TTL: A logic family that balances speed and power efficiency.
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Propagation Delay: The time required for signal transitions in a logical gate.
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Noise Margin: Ability of a circuit to handle noise before reverting to an undesired logic state.
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Input and Output Characteristics: Defined voltage levels for HIGH and LOW states and their current specifications.
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Speed-Power Product: A metric for comparing logic gates that considers speed and energy efficiency.
Examples & Real-Life Applications
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Examples
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The Fairchild Advanced Schottky TTL family operates with a propagation delay of 5.3ns, ensuring high-speed performance.
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Operating temperature ranges ensure function integrity across scenarios from 0Β°C to 70Β°C (74F-series) and -55Β°C to +125Β°C (54F-series).
Memory Aids
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π΅ Rhymes Time
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FAST logic shows great speed, keeps our circuits in the lead.
π Fascinating Stories
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Imagine a racing circuit where 2V represents the fastest car, and 0.8V is a slow one. The faster we go, the better our performance in the race against noise and power.
π§ Other Memory Gems
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For Fairchild Features: 'PIG - Propagation, Input, Grit' - remember the propagation delays, input currents, and their robustness.
π― Super Acronyms
FAS - Fast, Advanced, and Schottky represents the essence of this TTL family.
Flash Cards
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Glossary of Terms
Review the Definitions for terms.
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Term: Fairchild Advanced Schottky TTL
Definition:
A logic family also known as FAST logic that emphasizes speed and power efficiency.
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Term: Propagation Delay
Definition:
The time it takes for a logic change to propagate through a gate.
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Term: Logic HIGH/LOW
Definition:
The voltage levels that define a high or low signal in digital logic.
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Term: Noise Margin
Definition:
The amount of noise voltage that a logic family can tolerate without affecting the logic level.
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Term: SpeedPower Product
Definition:
A metric to assess the efficiency of a logic family, factoring in speed and power consumption.