Why has ECL family the lowest propagation delay?
In ECL, the transistors are never in saturation, the input/output voltages have a small swing (0.8 V), the input impedance is high and the output impedance is low. As a result, the transistors change states quickly, gate delays are low, and the fanout capability is high.
Which logic family has highest noise margin?
Also note that the noise margin in CMOS is higher than the noise margin in TTL for 5 volt logic levels. So …..
Which of the following is non saturating?
Which of the following is non-saturating? Explanation: Since it is non-saturating, ECL has low propagation delay.
Which of the following is non saturating TTL?
Since it is non-saturating, ECL has low propagation delay. 1. An OR gate has 4 inputs. One input is high and the other three are low.
Which of the following logic families has the shortest propagation delay?
Which of the following logic families has the shortest propagation delay? Explanation: AS-TTL (Advanced Schottky) has a maximum clock frequency that is 105 MHz. So, the propagation delay will be given by 1/105 sec which is the lowest one. It is followed by S-TTL and HCMOS in terms of increasing propagation delay.
Which of the following is non saturating family?
Non-saturated Bipolar Logic Families are: Schottky TTL. Emitter Coupled Logic (ECL)
Which logic family is fastest?
Emitter-coupled logic (ECL)
What is saturated bipolar?
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 do you mean by unipolar logic families?
In unipolar logic families, unipolar devices are the key element. MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a unipolar device, in which the current flows because of only one type of charge carriers (that is, either electrons or holes). The examples of unipolar families include PMOS, NMOS, and CMOS.
Which is faster TTL or CMOS?
TTL chips are generally faster than CMOS gates (but see ACT series), however there are two logic technologies faster than TTL-Emitter-coupled logic (ECL) and gallium arsenide (GaAs). These chips come at considerable cost in power consumption and ease of interface to other logic families.
What is RTL DTL TTL?
Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. *TTL contrasts with the preceding resistor-transistor logic (RTL) and diode-transistor logic (DTL) generations by using transistors not only to amplify the output but also to isolate the inputs.
Why TTL is faster than DTL?
During the transition the input transistor is briefly in its active region; so it draws a large current away from the base of the output transistor and thus quickly discharges its base. This is a critical advantage of TTL over DTL that speeds up the transition over a diode input structure.
Which is the fastest DTL TTL ECL MOS?
Like ECL, SCL is also the fastest among the logic families.
Is TTL analog or digital?
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 TTL in Ping?
It refers an aspect of the Internet Protocol. TTL is used when a “ping,” or a request for a response, is sent to another computer, such as a server. The TTL represents the number of hops, or servers in different locations, the request can travel to before returning a failed attempt message.
What is a good TTL?
Generally, we recommend a TTL of 24 hours (86,400 seconds). However, if you are planning to make DNS changes, you should lower the TTL to 5 minutes (300 seconds) at least 24 hours in advance of making the changes. After the changes are made, increase the TTL back to 24 hours.
What is TTL 64?
Up vote 0. 64 is the number of hops that the packet can travel before it is dropped. Hard to reach hosts that are across many hops of the Internet benefit from a larger TTL on packets. In multicast protocols 64 is used to restrict the packet to the same physical region. You may be seeing a multicast protocol.
What is TTL 63 in Ping?
TTL is Time To Live. Each hop decrements this field by one, and if it reaches 0 it is dropped (usually this happens only in loop situations). This makes sure that data packets are not congesting a network if there is a IP routing loop present. 63 is the number of hops that the packet can travel before it is dropped.
What is TTL 255 in ping?
TTL means Time to Live. Each hop (usually we can call it router) upon receiving the packet decrements this field by one. At the time this field becomes zero router discards this packet and sends back ICMP response. TTL is one byte value so it can have max value 255.
What is initial TTL?
A recommended initial value is 64. The time-to-live value can be thought of as an upper bound on the time that an IP datagram can exist in an Internet system. The TTL field is set by the sender of the datagram, and reduced by every router on the route to its destination.
What is MS in ping command?
Ping (latency is the technically more correct term) means the time it takes for a small data set to be transmitted from your device to a server on the Internet and back to your device again. The ping time is measured in milliseconds (ms).
Is 1 ms ping possible?
In 1ms, light will travel about 300Km (or about 186 miles). So if the server is 200 miles from you, the laws of the universe say you will never get 0ms ping. It might be possible if the server you’re pinging is within 150km of your location. Explanation: Light can travel roughly 300 km in 1 millisecond.
Is 50ms ping good?
Ping amounts of 100 ms and below are average for most broadband connections. In gaming, any amounts below a ping of 20 ms are considered exceptional and “low ping,” amounts between 50 ms and 100 ms range from very good to average, while a ping of 150 ms or more is less desirable and deemed “high ping.”