What is the range of invalid TTL output voltage?
Discussion :: Logic Families and Their Characteristics – General Questions (Q. No. 10)
| [A]. | 0.0–0.4 V |
|---|---|
| [B]. | 0.4–2.4 V |
| [C]. | 2.4–5.0 V |
| [D]. | 0.0–5.0 V |
How can ECL have both a NOR and an OR output?
How can ECL have both a NOR and an OR output? ECL does not have this feature. They are simply the inverse of each other.
What are advantages of ECL logic?
Following points summarize ECL advantages over TTL and CMOS: ➨It has fanout of 25 which is better than TTL and less then CMOS. ➨It has average propagation delay time ( 1 to 4 ns ) better compare to both TTL and CMOS. Hence it is known as fastest logic family.
What is unique about TTL devices such as the 74SXX?
What is unique about TTL devices such as the 74SXX? These devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.
What is the major advantage of ECL logic very high speed?
A major advantage of ECL logic over TTL and CMOS is ________.
Exercise :: Logic Gates – Filling the Blanks.
| A. | low power dissipation |
|---|---|
| B. | high speed |
| C. | both low power dissipation and high speed |
| D. | neither low power dissipation nor high speed |
How must the output of a gate act when it is low in a TTL circuit?
Explanation: If the gate output is Low in a TTL digital circuit, the gate must be capable of sinking current drawn from the input of gates. Thus, the output must act as a current sink.
What does TTL mean in electronics?
Transistor-transistor logic
Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL logic gate s are typically fabricated onto a single integrated circuit (IC). TTL ICs usually have four-digit numbers beginning with 74 or 54.
What is the difference between a 7400 and a 7411 IC?
What is the difference between a 7400 and a 7411 IC?
Exercise :: Logic Gates – General Questions.
| A. | 7400 has two four-input NAND gates; 7411 has three three-input AND gates |
|---|---|
| D. | 7400 has four two-input AND gates; 7411 has three three-input NAND gates |
Why ECL is faster than TTL?
ECL is based on use of current steering switch realised using differential transistor pair. ECL eliminates saturation and improves speed but uses more power than other logic families such as TTL and CMOS. ECL is fastest logic family among all and this is due to avoidance of saturation region for application.
What are the TTL output voltage levels?
A TTL input signal is defined as “low” when between 0 V and 0.8 V with respect to the ground terminal, and “high” when between 2 V and VCC (5 V), and if a voltage signal ranging between 0.8 V and 2.0 V is sent into the input of a TTL gate, there is no certain response from the gate and therefore it is considered “
What is the typical invalid voltage for a binary signal?
Voltages between 0.8 volts and 2.0 volts are considered illegal. The binary logic circuits should never encounter signals within this region except for a quick transition through it when switching states.
What is the maximum noise voltage that may appear at the input of a logic gate without changing the logical state of its output is termed as?
noise immunity
Explanation: The maximum noise voltage that may appear at the input of a logic gate without changing the logical state of its output is termed as noise immunity.
What is the propagation delay of TTL?
The standard TTL series has a typical propagation delay of 10ns (the term propagation delay was introduced in Chapter 4 and will be covered in more detail later in this chapter). By this we mean that when an input change occurs it takes 10 ns for the effect to propagate to the output.
What is the standard TTL noise margin?
Detailed Solution
| TTL | ECL | |
|---|---|---|
| Fan-Out | 10 | 25 |
| Power Dissipation (mW) | 10 | 175 |
| Noise Margin | 0.4 V | 0.16 V (lowest) |
| Propagation Delay | 10 | < 3 (lowest) |
What does TTL and CMOS stand for?
CMOS stands for complementary metal-oxide-semiconductor is also another classification of ICs that uses the Filed effect transistor in the design. TTL stands for Transistor transistor logic. It is a classification of integrated circuits.
What is one advantage of ECL over other devices?
A major advantage of ECL is that the current-steering behavior of the input stage (i.e., Q1 and Q2) does not cause disturbances in the way that CMOS switching does. However, this noise performance is achieved at the cost of burning more static power.
What is a TTL output?
TTL technology is standardized to a supply voltage of 5 V. A TTL signal is defined as a low logic level between 0 and 1.4 V, and as a high logic level between 2.4 V and 5 V. TTL is characterized by high switching speed, and some immunity to noise.
How much the output of a gate in a TTL digital circuit act when it is high?
TTL outputs are typically restricted to narrower limits, between 0 V and 0.4 V for a “LOW” and between 2.4 V and Vcc for a “HIGH”, providing at least 0.4 V of noise immunity.
Which type of output circuit this TTL has?
Questions: The output circuitry of a typical TTL logic gate is commonly referred to a totem-pole output because the two output transistors are stacked one above the other like carvings on a totem pole.
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.
What are the acceptable output levels for 5V TTL logic?
TTL gates operate on a nominal power supply voltage of 5 volts, +/- 0.25 volts. Ideally, a TTL “high” signal would be 5.00 volts exactly, and a TTL “low” signal 0.00 volts exactly.
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