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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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HCPL-4661 Fiches technique(PDF) 9 Page - Agilent(Hewlett-Packard) |
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HCPL-4661 Fiches technique(HTML) 9 Page - Agilent(Hewlett-Packard) |
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9 / 10 page  9 Propagation Delay, Pulse-Width Distortion and Propagation Delay Skew Propagation delay is a figure of merit which describes how quickly a logic signal propagates through a system. The propaga- tion delay from low to high (tPLH) is the amount of time required for an input signal to propagate to the output, causing the output to change from low to high. Similarly, the propagation delay from high to low (tPHL) is the amount of time required for the input signal to propagate to the output, causing the output to change from high to low (see Figure 7). Pulse-width distortion (PWD) results when tPLH and tPHL differ in value. PWD is defined as the difference between tPLH and tPHL and often determines the maximum data rate capability of a transmission system. PWD can be expressed in percent by dividing the PWD (in ns) by the minimum pulse width (in ns) being transmitted. Typically, PWD on the order of 20-30% of the minimum pulse width is tolerable; the exact figure depends on the particular appli- cation (RS232, RS422, T-1, etc.). Propagation delay skew, tPSK, is an important parameter to consider in parallel data appli- cations where synchronization of signals on parallel data lines is a concern. If the parallel data is being sent through a group of optocouplers, differences in propagation delays will cause the data to arrive at the outputs of the optocouplers at different times. If this difference in propagation delays is large enough, it will determine the maximum rate at which parallel data can be sent through the optocouplers. Propagation delay skew is defined as the difference between the minimum and maximum propagation delays, either tPLH or tPHL, for any given V = 5.0 V V = 0.6 V O CC 6 3 -60 -20 20 60 100 T – TEMPERATURE – °C A 2 80 40 0 -40 0 R = 350 K Ω L 1 4 5 R = 1 K Ω L R = 4 K Ω L Insulation Related Specifications DIP SOIC-8 Parameter Symbol Value Value Units Conditions Min. External Air Gap L(IO1) ≥7 ≥4 mm Measured from input terminals (Clearance) to output terminals Min. External Tracking L(IO2) ≥7 ≥4 mm Measured from input terminals Path (Creepage) to output tminals Min. Internal Plastic 0.08 0.08 mm Through insulation distance Gap (Clearance) conductor to conductor Tracking Resistance CTI 200 200 V DIN IEC 112/VDE 0303 Part 1 Isolation Group IIIa IIIa Material group (DIN VDE 0110) (per DIN VDE 0110) Figure 15. Input Threshold Current vs. Temperature. Figure 16. Recommended Printed Circuit Board Layout. GND BUS (BACK) V BUS (FRONT) CC OUTPUT 1 OUTPUT 2 0.1 µF 10 mm MAX (SEE NOTE 1) |
Numéro de pièce similaire - HCPL-4661 |
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Description similaire - HCPL-4661 |
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