Protection against noise in TTL (Transistor-Transistor Logic) circuits is essential because noise can lead to false triggering of logic levels, causing erroneous outputs and unreliable performance. TTL circuits operate with specific voltage thresholds, and any voltage fluctuations due to noise can disrupt signal integrity. Implementing noise protection, such as proper grounding, decoupling capacitors, and shielding, helps maintain stable operation and ensures accurate data processing in digital systems.
The low state dc noise margin for TTL dates is 0.3v and the high state noise margin is 0.7v
TTL (Transistor-Transistor Logic) high noise range refers to the voltage levels that are considered acceptable for a logic high state in TTL circuits. Typically, for standard TTL, a voltage above 2.0 volts is interpreted as a logical high, while voltages below this may be seen as low. The high noise margin is the difference between the minimum high input voltage (2.0V) and the maximum output low voltage (0.8V), resulting in a noise margin that ensures reliable operation despite voltage fluctuations. This margin helps prevent false triggering in digital circuits.
because TTL have a bias input setup to eliminate noise therefore the output will follow the logic one input if left open
Unused ttl inputs would normally default to logic 1 if left floating. but these inputs could act as antennas under certain conditions and they could pick up noise which can cause the circuit to malfunction. it is better to tie unused inputs to Vcc through a 1k resistor (74LS, 74XX etc) or simply return the inputs to ground. for most other ttl families, the 1k resistor might not be required.- Stan (Nigeria)
whis is Endurance mors or ttl
TTL
Unused ttl inputs would normally default to logic 1 if left floating. but these inputs could act as antennas under certain conditions and they could pick up noise which can cause the circuit to malfunction.
TTL stands for Time To Live
TTL is set to 40
TTL is faster and does not lose amplitude
The full form of TTL is Time To Live
Here are the propagation delays for these gatesa) ECL = 2nsb) TTL = 1.5-33ns depending on the type of TTL. Conventional TTL is 9ns, Advanced Schottky TTL is 1.5nsc) RTL = 25nsd) CMOS = 5-20ns depending on if it is conventional CMOS, TTL pin compatible CMOS, high speed TPC CMOS or TTL compatible CMOSSo the fastest would be the Advanced Schottky TTL (74ASxx) at 1.5ns but the choice simply said TTL which I would interpret as Conventional TTL (74xx/54xx) which would have a propagation delay at 9ns.So the winner is ... (a) ECL which has a propagation delay at 2ns.