it specifies the remaining " life" of the packet
246 CounterThe 74HC393 is a dual 4 bit TTL counter the two sets can be combined and with some tricky wiring you will be able to make it count only even numbers, but I will use a PIC12f675 MCU a small 8 pin device and with some very easy programing you will be able to count odd or even numbers, for more info on the last contact me by E-mail or my website http://www.patenttrade.net - - - - -Easy.A four-bit counter counts from 0 (D1-D4 all low) to 15 (D1-D4 all high). If you only want it to count 0, 2, 4, 6, 8, 10, 12 and 14--IOW all the numbers where D1 is low--just ground D1 and run the clock twice as fast as you normally would.
The difference between max232 and rs232 is the voltage levels of the rs232 are high. In order to reduce those voltage means to convert those voltage levels to TTL logic levels we use max232 integrated chip which is a dual driver/ receiver.
TTL in the ISO/OSI Stack (IP Networks) ======================= TTL (Time To Live) is the time a message has to live given in hops. Each time the package is forwarded this counter counts down. With the TTL one avoids a datagram being routed in circles and cloaking the "intertube"'s up.
whis is Endurance mors or ttl
TTL
A: TTL gates operates on the premise of having +5 dc on the rail therefore the output will be in the range +5 volts. A cmos gate while similar to a TTL function is not really compatible since the output volts can be 12 volts or more. Besides that TTL gates require some input current for it to operate
Compatibility in TTL means that the output of one TTL device can be used to drive the Input of the other TTL device , This because the low and high output window fit inside the low and high input window/profile TTL stand for Transistor Transistor Logic, so any voltage between 0 and 5 volt is compatible where any voltage between 3V and 5V is logic 1 and zero volt is logic 0
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.
The main advantage of ECL over TTL is speed.