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ISL3280EFHZ-T 数据表(PDF) 10 Page - Intersil Corporation |
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ISL3280EFHZ-T 数据表(HTML) 10 Page - Intersil Corporation |
10 / 16 page ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E 10 FN6543.4 July 27, 2015 Submit Document Feedback IEC61000-4-2 Testing The IEC61000 test method applies to finished equipment, rather than to an individual IC. Therefore, the pins most likely to suffer an ESD event are those that are exposed to the outside world (the RS-485 pins in this case) and the IC is tested in its typical application configuration (power applied) rather than testing each pin-to-pin combination. The lower current limiting resistor coupled with the larger charge storage capacitor yields a test that is much more severe than the HBM test. The extra ESD protection built into this device’s RS-485 pins allows the design of equipment meeting level 4 criteria without the need for additional board level protection on the RS-485 port. AIR-GAP DISCHARGE TEST METHOD For this test method, a charged probe tip moves toward the IC pin until the voltage arcs to it. The current waveform delivered to the IC pin depends on approach speed, humidity, temperature, etc., so it is difficult to obtain repeatable results. The A and B RS-485 pins withstand ±16.5kV air-gap discharges. CONTACT DISCHARGE TEST METHOD During the contact discharge test, the probe contacts the tested pin before the probe tip is energized, thereby eliminating the variables associated with the air-gap discharge. The result is a more repeatable and predictable test, but equipment limits prevent testing devices at voltages higher than ±9kV. The ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E survive ±9kV contact discharges on the RS-485 pins. Data Rate, Cables and Terminations RS-485, RS-422 are intended for network lengths up to 4000’, but the maximum system data rate decreases as the transmission length increases. Networks operating at 20Mbps are limited to lengths less than 100’, while a 250kbps network that uses slew rate limited transmitters can operate at that data rate over lengths of several thousand feet. Twisted pair is the cable of choice for RS-485, RS-422 networks. Twisted pair cables tend to pick up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receiver in these ICs. To minimize reflections, proper termination is imperative for high data rate networks. Short networks using slew rate limited transmitters need not be terminated, but terminations are recommended unless power dissipation is an overriding concern. In point-to-point, or point-to-multipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120Ω) at the end farthest from the driver. In multi receiver applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multi driver) systems require that the main cable be terminated in its characteristic impedance at both ends. Stubs connecting a transmitter or receiver to the main cable should be kept as short as possible. Low Power Shutdown Mode These BiCMOS receivers all use a fraction of the power required by their bipolar counterparts and the versions with output enable functions include a shutdown feature that reduces the already low quiescent ICC to a 20µA trickle. These versions enter shutdown whenever the receiver disables (RE =VCC or RE = GND). Typical Performance Curves C L = 15pF, TA = +25°C; unless otherwise specified. FIGURE 7. SUPPLY CURRENT vs TEMPERATURE FIGURE 8. VL SUPPLY CURRENT vs ENABLE PIN VOLTAGE TEMPERATURE (°C) 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 RE = VCC, RE = 0V VCC = VL = 5V VCC = VL = 3.3V -40 10 60 -15 35 110 85 125 02 4 RE VOLTAGE (V) 13 5 0 50 100 150 200 250 67 7.5 VCC = 5V OR 3.3V VL = 3.3V VL = 5V, VCC = 5V ONLY VL = 2.5V VL 1.8V |
类似零件编号 - ISL3280EFHZ-T |
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类似说明 - ISL3280EFHZ-T |
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