birt code 39

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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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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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To clarify the need for management skills, note the various career levels in Figure 23 Although systems analysis career paths can vary depending on the size of the organization and the way the information systems department is organized, the figure gives an idea of the various levels at which an individual might work in a medium-sized organization In a larger organization, there would be more levels between trainee and senior analyst The manager of systems analysis is in full charge This individual may personally supervise the operations of the systems analysis area or may delegate this to a subordinate Responsibilities include the overall analysis of how information systems technologies can be applied to user problems through the design of efficient and effective systems This requires the integration of systems analysis activities and the various functional areas of the organization Usually a minimum of five years of systems development experience and some management duties are required for this position It can lead to information systems management The lead analyst is essentially the assistant manager, functioning in place of the manager in case of his or her absence In addition to performing supervisory duties and assisting in planning, organizing, and controlling the activities of the systems analysis section, the lead analyst also may perform technical tasks The senior analyst works at the highest technical level of an activity Typical responsibilities include liaison with users, systems specification and design, and project control The senior analyst may supervise analysts and programmers until a system is implemented and may occasionally assist in programming The minimum requirements for this position usually include two years of systems design experience, some programming experience, and specialized industry or organizational experience Systems analysts work with users to define the project or some aspect of it and to work out details in specification The amount of supervision given any.

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