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ISL4485EIBZ Folha de dados(PDF) 8 Page - Intersil Corporation |
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ISL4485EIBZ Folha de dados(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 temperature drops about 15 degrees. If the contention persists, the thermal shutdown / reenable cycle repeats until the fault is cleared. Receivers stay operational during thermal shutdown. ESD Protection All pins on these interface devices include class 3 Human Body Model (HBM) ESD protection structures, but the RS-485 pins (driver outputs and receiver inputs) incorporate advanced structures allowing them to survive ESD events in excess of ±15kV HBM. The RS-485 pins are particularly vulnerable to ESD damage because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up, protect without allowing any latchup mechanism to activate, and without degrading the RS-485 common mode range of -7V to +12V. This built-in ESD protection eliminates the need for board level protection structures (e.g., transient suppression diodes), and the associated, undesirable capacitive load they present. Human Body Model Testing As the name implies, this test method emulates the ESD event delivered to an IC during human handling. The tester delivers the charge stored on a 100pF capacitor through a 1.5k Ω current limiting resistor into the pin under test. The HBM method determines an ICs ability to withstand the ESD events typically present during handling and manufacturing. The RS-485 pin survivability on this high ESD device has been characterized to be in excess of ±15kV, for discharges to GND. Typical Performance Curves VCC = 5V, TA = 25oC; Unless Otherwise Specified FIGURE 7. DRIVER AND RECEIVER WAVEFORMS DRIVING 300 FEET OF CABLE (DOUBLE TERMINATED) FIGURE 8. DRIVER AND RECEIVER WAVEFORMS DRIVING 450 FEET OF CABLE (DOUBLE TERMINATED) FIGURE 9. DATA RATE vs DIFFERENTIAL CAPACITANCE FIGURE 10. SUPPLY CURRENT vs TEMPERATURE TIME (20ns/DIV) -3 1.5 3 -1.5 0 A - B 0 5 0 5 DI RO DRIVER+CABLE DELAY (~450ns) TIME (20ns/DIV) -3 1.5 3 -1.5 0 A - B 0 5 0 5 DI RO DRIVER+CABLE DELAY (~650ns) DIFFERENTIAL CAPACITANCE (pF) 500 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 0 5 10 15 20 25 30 RDIFF = 54Ω -40 0 50 85 TEMPERATURE (oC) -25 25 75 400 450 500 550 600 650 700 750 DE = VCC, RE = X DE = GND, RE = X ISL4485E |
Nº de peça semelhante - ISL4485EIBZ |
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Descrição semelhante - ISL4485EIBZ |
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