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Threshold t t t t Positive edge trigger rising output
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Figure 1559 IC monostable multivibrator waveforms
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A typical IC one-shot circuit based on the 74123 (see the data sheet at the end of the chapter) is displayed in Figure 1560 The 74123 is a dual one-shot, meaning that the package contains two monostable multivibrators, which can be used independently The outputs of the one-shot are indicated by the symbols Q1 , Q1 , Q2 , and Q2 , where the bar indicates the complement of the output For example, if Q1 corresponds to a positive-going output pulse, Q1 indicates a negative-going output pulse, of equal duration
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15
Electronic Instrumentation and Measurements
NC 100 k 5V 1 k 047 F 5V Q1 Output 047 F 10 k 8 9 Q2 74123 NC NC 5V
5V 1 Trigger signal 16
5V 001 F
Figure 1560 Dual one-shot circuit
Timer ICs: The NE555 The discussion of op-amp based timing circuits presented in the previous sections served the purpose of introducing a large family of integrated circuits that can provide exible timing waveforms These fall for our purposes into one of two classes: pulse generators, and clock waveform generators s 13 and 14 delve into a more detailed analysis of digital timing circuits, a family to which the circuits of the previous sections belong This section will now introduce a multipurpose integrated circuit that can perform both the monostable and astable multivibrator functions The main advantage of the integrated circuit implementation of these circuits (as opposed to the discrete op-amp version previously discussed) lies in the greater accuracy and repeatability one can obtain with ICs, their ease of application, and the exibility provided in the integrated circuit packages The NE555 is a timer circuit capable of producing accurate time delays (pulses) or oscillation In the time-delay, or monostable, mode, the time delay or pulse duration is controlled by an external RC network In the astable, or clock generator, mode, the frequency is controlled by two external resistors and one capacitor Figure 1561 depicts typical circuits for monostable and astable operation of the NE555 Note that the threshold level and the trigger level can also be externally controlled For the monostable circuit, the pulse width can be computed from the following equation: T = 11R1 C (1554)
For the astable circuit, the positive pulse width can be computed from the following equation: T+ = 069(R1 + R2 )C (1555)
Part II
Electronics
VCC 1 2 Trig 3 Out 4 5 001 F NE555 monostable multivibrator NE555 astable multivibrator NE555 6 C Reset 4 5 Cont NE555 pin-out Out 3 8 R1 7 Trig 2 NE555 6 Thresh Out 4 5 3 7 Disch 2 NE555 6 7 Ground 1 8 VCC 1 8
R1 R2 C
001 F
Figure 1561 NE555 timer
and the negative pulse width can be computed from T = 069R2 C The use of the NE555 timer is illustrated in Example 1515 (1556)
EXAMPLE 1515 Analysis of 555 Timer
Problem
Calculate the component values required to obtain a 0421-ms pulse using the 555 timer monostable con guration of Figure 1561
Solution
Known Quantities: Desired pulse duration T Find: Values of R1 , C Schematics, Diagrams, Circuits, and Given Data: T = 0421 ms Assumptions: Assume a value for C Analysis: Using equation 1554,
T = 11R1 C And assuming C = 1 F, we calculate 0421 10 3 = 11R1 10 6 or R1 = 38273
Comments: Any reasonable combination of R1 and C values can yield the desired
design value of T Thus, the component selection shown in this example is not unique
Focus on Computer-Aided Tools: The Electronics Workbench solution of this example may be found in the accompanying CD-ROM
15
Electronic Instrumentation and Measurements
Check Your Understanding
1517 Verify that the transfer characteristic of Figure 1542 is correct 1518 For the comparator circuit shown in Figure 1562, sketch the waveforms vout (t)
and vS (t) if vS (t) = 01 cos ( t) and Vref = 50 mV
50
+ v (t) ~ S _
+
+ vout 15 V
1519 Derive the expressions for the switching thresholds of the Schmitt trigger of Figure 1548 1520 Explain why positive feedback increases the switching speed of a comparator 1521 Compute the period of the square wave generated by the multivibrator of Figure 1553 if C = 1 F, R1 = 10 k , R3 = 100 k , and R2 = 1 k 1522 Compute the value of R3 that would increase the duration of the one-shot pulse
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