What is TTL in circuits?
What is TTL in circuits?
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). A TTL device employs transistor s with multiple emitters in gates having more than one input.
What is TTL explain how is it used?
Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function (the first “transistor”) and the amplifying function (the second “transistor”), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL).
Why is the TTL output circuitry called totem pole?
The output circuitry of this particular gate is commonly referred to as “totem-pole,” because the two output transistors are stacked one above the other like figures on a totem pole. TTL gates equipped with totem-pole output circuitry are able to both source and sink load current.
What is basic TTL gate?
Basic TTL Logic Gates This simplified NAND gate circuit consists of an input transistor, TR1 which has two (or more) emitter terminals and a single stage inverting NPN switching transistor circuit of TR2. The multiple emitters of TR1 are connected as inputs thus producing a NAND gate function.
What is TTL output?
TTL is an acronym for Transistor-Transistor Logic. VOH — Minimum OUTPUT Voltage level a TTL device will provide for a HIGH signal. VIH — Minimum INPUT Voltage level to be considered a HIGH. VOL — Maximum OUTPUT Voltage level a device will provide for a LOW signal.
What are the characteristics of TTL?
The features of the TTL family include the following.
- Logic low level is at 0 or 0.2V.
- Logic high level is at 5V.
- Typical fan out of 10.
- A basic TTL device draws a power of almost 10mW, which reduces with the use of Schottky devices.
- The average propagation delay is about 9ns.
- The noise margin is about 0.4V.
What is the function of TTL gate?
The Transistor-Transistor Logic (TTL) is a logic family made up of BJTs (bipolar junction transistors). As the name suggests, the transistor performs two functions like logic as well as amplifying. The best examples of TTL are logic gates namely the 7402 NOR Gate & the 7400 NAND gate.
What is the theory of a TTL circuit?
Transistor-transistor logic (TTL) is a class of digital circuits made from bipolar junction transistors (BJT) and resistors. This is termed as transistor-transistor logic since both the logic gating function (example: AND) and the amplifying function are executed by the transistors (contrary with DTL and RTL).
What is the application of TTL in integrated circuits?
TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers.
What are the voltage levels for TTL and CMOS?
CMOS has longer rise and fall times thus digital signals are simpler and less expensive with the CMOS chips. There is a substantial difference in the voltage level range for both. For TTL it is 4.75 V to 5.25 V while for CMOS it ranges between 0 to 1/3 VDD at a low level and 2/3VDD to VDD at high levels.
What is a TTL output?
TTL output is often called differential line driver output. Rotary encoders can also track linear distance traveled, based on how many rotations of the shaft have taken place; or speed, based on the change in shaft position relative to the measurement time.