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MC10198 Datenblatt(PDF) 7 Page - ON Semiconductor |
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MC10198 Datenblatt(HTML) 7 Page - ON Semiconductor |
7 / 10 page MC10198 MOTOROLA MECL Data DL122 — Rev 6 3–178 3.HI–SPEED INPUT — This input is used for stretching very narrow pulses with minimum delay between the output pulse and the trigger pulse. The trigger input should be disabled when using the high–speed input. The MC10198 triggers on the rising edge, using this in- put, and input pulse width should narrow, typically less than 10 nanoseconds. USAGE RULES: 1.Capacitor lead lengths should be kept very short to mini- mize ringing due to fast recovery rise times. 2.The E inputs should not be tied to ground to establish a high logic level. A resistor divider or diode can be used to establish a –0.7 to –0.9 voltage level. 3.For optimum temperature stability; 0.5 mA is the best tim- ing current IT. The device is designed to have a constant voltage at the EXTERNAL PULSE WIDTH CONTROL over temperature at this current value. 4.Pulse Width modulation can be attained with the EXTER- NAL PULSE WIDTH CONTROL. The timing current can be altered to vary the pulse width. Two schemes are: a. The internal resistor is not used. A dependent cur- rent source is used to set the timing current as shown in Figure 4. A graph of pulse width versus timing current (CExt = 13 pF) is shown in Figure 5. b. A control voltage can also be used to vary the pulse width using an additional resistor (Figure 6). The current (IT + IC) is set by the voltage drop across RInt + RExt. The control current IC modifies IT and alters the pulse width. Current IC should never force IT to zero. RC typically 1 kΩ. FIGURE 5 — PULSE WIDTH versus IT @ CExt = 13 pF 0.01 mA 0.1 mA 1 mA 10 mA 1000 100 10 MC10198 FIGURE 4 — CExt 7 4 I FIGURE 6 — –5.2 V Control Voltage 284 RExt CExt 6 4 7 IT + IC IT IC –3.6 V RC IT – TIMING CURRENT |
Ähnliche Teilenummer - MC10198 |
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Ähnliche Beschreibung - MC10198 |
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