transistor transistor logic

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Digital Electronics TRANSISTOR TRANSISTOR LOGIC(TTL)

Transcript of transistor transistor logic

Page 1: transistor transistor logic

Digital ElectronicsTRANSISTOR TRANSISTOR LOGIC(TTL)

Page 2: transistor transistor logic

CONTAIN:7400 TTL series.Two input TTL-NAND Gate.Totem-pole output stage of TTL.Advantages –disadvantages of totem-pole.Clamping diodes.5400 series.Advantages –disadvanges of TTL.

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7400 TTL Serieso TTL ICs first developed in 1965 and they

are known as “standard TTL” . This version of TTL circuit is not available now.

o TTL family use only transistor to perform the basic logic operations.

o The standard TTL is improved to a great extent over the year.

o TTL devices are still used as “glue” logic which connects more complex devices in digital system.

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Two Input TTL-NAND Gate The first, let us replace transistor Q1 by its

equivalent circuits.A and B are the input terminals.The i/p voltage A and B can be either low

(zero volts ideally) or High (+Vcc ideally).A and B both low : If A and B both are

connected to ground, then both the B-E junction of the transistor T1 are forward biased.

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Totem – pole Output Stage of TTLThe arrangement of Q1 and Q2 on the output

side of a TTL NAND gate is called the totem-pole arrangement.

In this circuit, the three output component Q1,Q2 and diode D1 are stacked one on the top of the other in the form of totem-pole. At any time, only one of them will be conducting.

The Totem-pole output is also known as Active pull-up.

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Advantages and Disadvantages of Totem pole output

Advantages:1. External pull up resistor is not required2. Operating speed is high

Disadvantages:Output of two gates cannot be tied together

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Clamping DiodesThe TTL input should not be subjected in negative

voltage.If voltage transition are applied at the input,then there

is a possibility of ringing. Due to ringing the input will be subjected to negative voltages.

To suppress this ringing, clamping diodes are generally connected externally in all the TTL circuits.

This are fast recovery diodes. They are forward during the negative half cycles of the ringing sinusoidal waveform. Hence the negative input voltage will be restricted(clamped)to -0.7 volts approximately.

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Clamping diodes

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54000 Series The devices of 5400 series oprate over the

temperature range of -55 to 125˚c and over the suppl voltage range of 4.5 to 5.5 volts.

5400 TTL series developed specially for the milatry applications.

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ADVANTAGES of TTLTTL circuit are fast.Low propagation delay.Power dissiparation is not dependent on

frequency.Compatibale to all the other families.Latch ups do not take place.These are not susceptible to the damage due

to static charges.

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Disadvantages of TTLLarge power dissipation.Less component density.Can operate only on +5 V power supply.Poor noise immunity.

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THANK YOU


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