March 2006
Intermediate to advanced
960 pages
25h 28m
English
Content preview from Electronic Devices and Integrated Circuits
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17
Integrated Circuit Timers
17.1 Introduction
Among the integrated circuit family of timers: 555, 556, and 558, the IC555 is the most popular, cheap, and versatile timer. The Signetics Corporation introduced the bipolar version of the 555 of integrated circuit timer in the year 1972. Many other companies too have introduced their CMOS version. The 555 is capable of generating stable time delays of the order of microseconds to hours. It uses the supply voltage in the range of +5V to +18V. It is compatible to both TTL and CMOS circuits.
Figure 17.1(a) Block diagram of 555-timer
The circuit of the 555 timer consists of two comparators, an SR Flip-Flop ...
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