Floyd digital fundamentals 10th edition pdf download

The truth table for a negative-edge triggered D flip-flop is identical except for the direction of the arrow.

The J-K flip-flop is more versatile than the D flip flop. In addition to the clock input, it has two inputs, labeled J and K. Set Toggle Set Latch. A D-flip-flop does not have a toggle mode like the J-K flip- flop, but you can hardwire a toggle mode by connecting Q back to D as shown. This is useful in some counters as you will see in Chapter 8.

Because the Q flip-flop only changes on the active edge, the output will only change once for each clock pulse. D flip-flop hardwired for a toggle mode. Synchronous inputs are transferred in the triggering edge of the clock for example the D or J-K inputs.

Most flip- flops have other inputs that are asynchronous, meaning they affect the output independent of the clock. Flip-flops J Q. Even faster logic is available for specialized applications. Another propagation delay time specification is the time required for an asynchronous input to cause a change in the output.

The 74AHC family has specified delay times under 5 ns. Set-up time and hold time are times required before and after the clock transition that data must be present to be reliably clocked into the flip-flop. D Setup time is the minimum time for the data to be present CLK before the clock. Set-up time, ts. D Hold time is the minimum time for the data to remain CLK after the clock.

Other specifications include maximum clock frequency, minimum pulse widths for various inputs, and power dissipation. The power dissipation is the product of the supply voltage and the average current required.

A useful comparison between logic families is the speed-power product which uses two of the specifications discussed: the average propagation delay and the average power dissipation. The unit is energy. What is the speed-power product for 74AHC74A? Use the data from Table to determine the answer. From Table , the average propagation delay is 4. The quiescent power dissipated is 1. Therefore, the speed-power product is 5 pJ. Q2 Typically, for data storage D.

Data is stored until the D Q3 next clock pulse. Clock C. R Clear. For frequency division, it is simple to use a flip-flop in the toggle mode or to chain a series of toggle flip flops to continue to divide by two. Waveforms: fout.

When triggered, it goes to its unstable state for a predetermined length of time, then returns to its stable state. Q Trigger. Retriggerable one-shots respond to any trigger, even if it occurs in the unstable state. If it occurs during the unstable state, the state is extended by an amount equal to the pulse width. Retriggerable one-shot: Trigger Retriggers Q tW. An application for a retriggerable one-shot is a power failure detection circuit. Triggers are derived from the ac power source, and continue to retrigger the one shot.

In the event of a power failure, the one-shot is not triggered and an alarm can be initiated. Triggers Missing trigger derived due to power from ac failure. The timer can be configured in various ways, including as a one-shot. A basic one shot is shown. GND C1 1. The can be configured as a basic astable multivibrator with the circuit shown. File Name: digital fundamentals floyd 10th edition. View larger.

For Digital Electronics courses requiring a comprehensive text covering basic to advanced digital concepts with an emphasis on problem solving, troubleshooting, and applications.

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Log In Sign Up. Download Free PDF. Jamil Aziz. Download PDF. A short summary of this paper. Analog systems can generally handle higher power than digital systems. Digital systems can process, store, and transmit data more efficiently but can only assign discrete values to each point. A typical CD player accepts digital data from the CD drive and converts it to an analog signal for amplification. The voltages represent numbers in the binary system. Digital waveforms are made up of a series of pulses.

The frequency is the rate it repeats and is measured in hertz. Duty cycle is the ratio of tW to T. True only if one or more input conditions are true. Indicates the opposite condition. Serial bits on input line Initially, the register contains onlyinvalid 0 0 0 0 data or all zeros as shown here. First bit 1 is shifted serially into the 1 0 0 0 register. Second bit 0 is shifted serially into 01 0 1 0 0 register and first bit is shifted right.

Third bit 1 is shifted into register and 0 1 0 1 0 the first and second bits are shifted right. Fourth bit 0 is shifted into register and 0 1 0 1 the first, second, and third bits are shifted right. The register now stores all four bits and is full. The circuit is wired using DIP chips and tested. DIP chips In this case, testing can be done by a computer connected to the system.

The logic can be programmed for a specific purpose. In general, they cost less and use less board space that fixed function devices. Digital Related to digits or discrete quantities; having a set of discrete values. Binary Having two values or states; describes a number system that has a base of two and utilizes 1 and 0 as its digits. Bit A binary digit, which can be a 1 or a 0.

Pulse A sudden change from one level to another, followed after a time, called the pulse width, by a sudden change back to the original level. Download Download PDF. Translate PDF. Analog systems can generally handle higher power than digital systems. Digital systems can process, store, and transmit data more efficiently but can only assign discrete values to each point.

A typical CD player accepts digital data from the CD drive and converts it to an analog signal for amplification. The voltages represent numbers in the binary system. Digital waveforms are made up of a series of pulses. The frequency is the rate it repeats and is measured in hertz.

Duty cycle is the ratio of tW to T. True only if one or more input conditions are true. Indicates the opposite condition. Serial bits on input line Initially, the register contains onlyinvalid 0 0 0 0 data or all zeros as shown here. First bit 1 is shifted serially into the 1 0 0 0 register. Second bit 0 is shifted serially into 01 0 1 0 0 register and first bit is shifted right. Third bit 1 is shifted into register and 0 1 0 1 0 the first and second bits are shifted right.

Fourth bit 0 is shifted into register and 0 1 0 1 the first, second, and third bits are shifted right.