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MC14490FG Fiches technique(PDF) 7 Page - ON Semiconductor |
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MC14490FG Fiches technique(HTML) 7 Page - ON Semiconductor |
7 / 11 page MC14490 http://onsemi.com 7 TYPICAL APPLICATIONS ASYMMETRICAL TIMING In applications where different leading and trailing edge delays are required (such as a fast attack/slow release timer.) Clocks of different frequencies can be gated into the MC14490 as shown in Figure 6. In order to produce a slow attack/fast release circuit leads A and B should be interchanged. The clock out lead can then be used to feed clock signals to the other MC14490 packages where the asymmetrical input/output timing is required. Figure 6. Fast Attack/Slow Release Circuit IN OUT OSCout MC14011B OSCin AB fC/N EXTERNAL CLOCK ÷ N fC MC14490 LATCHED OUTPUT The contents of the Bounce Eliminator can be latched by using several extra gates as shown in Figure 7. If the latch lead is high the clock will be stopped when the output goes low. This will hold the output low even though the input has returned to the high state. Any time the clock is stopped the outputs will be representative of the input signal four clock periods earlier. Figure 7. Latched Output Circuit IN OUT OSCout MC14011B OSCin MC14490 CLOCK LATCH = 1 UNLATCH = 0 MULTIPLE TIMING SIGNALS As shown in Figure 8, the Bounce Eliminator circuits can be connected in series. In this configuration each output is delayed by four clock periods relative to its respective input. This configuration may be used to generate multiple timing signals such as a delay line, for programming other timing operations. One application of the above is shown in Figure 9, where it is required to have a single pulse output for a single operation (make) of the push button or relay contact. This only requires the series connection of two Bounce Eliminator circuits, one inverter, and one NOR gate in order to generate the signal AB as shown in Figures 9 and 10. The signal AB is four clock periods in length. If the inverter is switched to the A output, the pulse AB will be generated upon release or break of the contact. With the use of a few additional parts many different pulses and waveshapes may be generated. Figure 8. Multiple Timing Circuit Connections 10 5 12 3 14 1 79 6 11 4 13 2 15 Aout Bout Cout Dout Eout Fout OSCin CLOCK B.E. 6 B.E. 5 B.E. 4 B.E. 3 B.E. 2 B.E. 1 OSCout Ain Bin Cin Din Ein Fin |
Numéro de pièce similaire - MC14490FG |
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Description similaire - MC14490FG |
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