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LM122H データシート(PDF) 8 Page - National Semiconductor (TI) |
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LM122H データシート(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page Typical Applications (Continued) TLH7768 – 14 FIGURE 4 Time Out on Power Up (Relay Energized Until Rt Ct Seconds After VCC is Applied) TLH7768 – 15 FIGURE 5 5V Logic Supply Driving 28V Relay 30V Supply Interfacing with 5V Logic Figure 6 indicates the ability of the timer to interface to digi- tal logic when operating off a high supply voltage VOUT swings between a5V and ground with a minimum fanout of 5 for medium speed TTL If the logic is sensitive to risefall time of the trailing edge of the output pulse the trigger pin should be low at that time TLH7768 – 16 FIGURE 6 30V Supply Interfacing with 5V Logic Astable Operation The LM122 can be made into a self-starting oscillator by feeding the output back to the trigger input through a capac- itor as shown in Figure 7 Operating frequency is 1(Rt a R1)(Ct) The output is a narrow negative pulse whose width is approximately 2R2 Cf For optimum frequency stability Cf should be as small as possible The minimum value is deter- mined by the time required to discharge Ct through the inter- nal discharge transistor A conservative value for Cf can be chosen from the graph included with Figure 20 For frequen- cies below 1 kHz the frequency error introduced by Cf is a few tenths of one percent or less for Rt t 500k See Chart TLH7768 – 17 TLH7768 – 18 FIGURE 7 Oscillator One Hour Timer with Reset and Manual Cycle End Figure 8 shows the LM122 connected as a one hour timer with manual controls for start reset and cycle end S1 starts timing but has no effect after timing has started S2 is a center off switch which can either end the cycle prema- turely with the appropriate change in output state and dis- charging of Ct or cause Ct to be reset to 0V without a change in output In the latter case a new timing period starts as soon as S2 is released Dearborn Electronics LP9A1A476K Polycarbonate TLH7768 – 19 FIGURE 8 One Hour Timer with Reset and Manual Cycle End 8 |
同様の部品番号 - LM122H |
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同様の説明 - LM122H |
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