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28-6 An integrator circuit
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that uses an op amp.
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496 Integrated Circuits
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Timer A timer IC is a specialized oscillator that produces a delayed output. The delay is adjustable to suit the needs of a particular device. The delay is generated by counting the number of oscillator pulses; the length of the delay can be adjusted by means of external resistors and capacitors. Timers are commonly used in circuits such as digital frequency counters, where a precise time interval or window must be provided. Multiplexer A multiplexer IC allows several different signals to be combined in a single channel by means of a process called multiplexing. An analog multiplexer can also be used in reverse; then it works as a demultiplexer. Thus, you ll sometimes hear or read about a multiplexer/demultiplexer IC. Comparator A comparator IC has two inputs. It compares the voltages at the two inputs, which are called A and B. If the voltage at input A is significantly higher than the voltage at input B, the output is about +5 V. This is logic 1, or high. If the voltage at input A is lower than or equal to the voltage at input B, the output voltage is about +2 V. This is designated as logic 0, or low. Voltage comparators are available for a variety of applications. Some can switch between low and high states at a rapid rate of speed, while others are slow. Some have low input impedance, and others have high impedance. Some are intended for AF or low-frequency RF use; others are fabricated for video or high-frequency RF applications. Voltage comparators can be used to actuate, or trigger, other devices such as relays and electronic switching circuits.
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Digital ICs
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A digital IC, also sometimes called a digital-logic IC, operates using two discrete states: high (logic 1) and low (logic 0). Digital logic is discussed in Chap. 26. Digital ICs contain massive arrays of logic gates that perform Boolean operations at high speed.
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Transistor-Transistor Logic In transistor-transistor logic (TTL), arrays of bipolar transistors, some with multiple emitters, operate on dc pulses. This technology has several variants, some of which date back to around 1970. A basic TTL gate is illustrated in Fig. 28-7. This gate uses two NPN bipolar transistors, one of which is a dual-emitter device. The transistors are always either completely cut off, or else completely saturated. Because of this, TTL is relatively immune to external noise. Emitter-Coupled Logic Another bipolar-transistor logic form is known as emitter-coupled logic (ECL). In an ECL device, the transistors are not operated at saturation, as they are with TTL. This increases the speed. But noise pulses have a greater effect in ECL, because unsaturated transistors are sensitive to, and can actually amplify, external signals and noise. The schematic of Fig. 28-8 shows a basic ECL gate using four NPN bipolar transistors.
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28-7 A transistor-transistor
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logic (TTL) gate. In this gate, two NPN bipolar transistors are used. Note that one of the transistors has two emitters.
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Metal-Oxide-Semiconductor Logic Digital ICs can also be constructed using metal-oxide-semiconductor (MOS) devices. N-channel MOS (NMOS) logic, pronounced EN-moss logic, offers simplicity of design, along with high operating speed. P-channel MOS logic, pronounced PEA-moss logic, is similar to NMOS logic, but the speed is slower. An NMOS or PMOS digital IC is like a circuit that uses only N-channel MOSFETs, or only P-channel MOSFETs, respectively. Complementary-metal-oxide-semiconductor (CMOS) logic, pronounced SEA-moss logic, employs both N-type and P-type silicon on a single chip. This is analogous to using both N-channel
28-8 An emitter-coupled
logic (ECL) gate using four NPN bipolar transistors.
498 Integrated Circuits
and P-channel MOSFETs in a circuit. The advantages of CMOS technology include extremely low current drain, high operating speed, and immunity to noise. All forms of MOS logic ICs require care in handling to prevent destruction by electrostatic discharges. The precautions are the same as those that are required when handling MOSFETs. All technical personnel who work with the devices should be grounded. This can be achieved by having technicians wear metal wrist straps connected to a good electrical ground, and by ensuring that the relative humidity in the lab is not allowed to get too low. When MOS ICs are stored, the pins should be pushed into special conductive foam that is manufactured for that purpose.
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