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ISL54227 データシート(PDF) 11 Page - Intersil Corporation |
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ISL54227 データシート(HTML) 11 Page - Intersil Corporation |
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11 / 18 page  ISL54227 11 FN7593.0 July 2, 2010 The OE and LP pins are internally pulled low through a 4MΩ resistor to ground and can be tri-stated or left floating. The ISL54227 is designed to minimize IDD current consumption when the logic control voltage is lower than the VDD supply voltage. With VDD = 3.6V and the OE logic pin is at 1.4V the part typically draws only 25µA. With VDD = 4.3V and the OE logic pin is at 2.6V the part typically draws only 35µA. Driving the logic pin to the VDD supply rail minimizes power consumption. The OE and LP pin can be driven with a voltage higher than the VDD supply voltage. It can be driven up to 5.25V with a VDD supply in the range of 2.7V to 5.25V. Low Power Mode If the OE pin = Logic “0”, and the LP pin = Logic “1” the switches will turn OFF (high impedance) and the part will be put in a low power mode. In this mode the part draws only 10µA (max) of current across the operating temperature range. Normal Operation Mode With a signal level in the range of 0V to 3.6V and with the LP pin = Logic “0” the switches will be ON when the OE pin = Logic “1” and will be OFF (high impedance) when the OE pin = Logic “0”. USB 2.0 VBUS Short Requirments The USB specification in section 7.1.1 states a USB device must be able to withstand a VBUS short (4.4V to 5.25V) or a -1V short to the D+ or D- signal lines when the device is either powered off or powered on for at least 24 hours. The ISL54227 part has special power-off protection and OVP detection circuitry to meet these short circuit requirements. This circuitry allows the ISL54227 to provide protection to the USB down-stream transceiver connected at its signal pins (D-, D+) to meet the USB specification short circuit requirements. The power-off protection and OVP circuitry allows the COM pins (COM-, COM+) to be driven up to 5.25V or down to -5V while the VDD supply voltage is in the range of 0V to 5.25V. In these overvoltage conditions with a 500Ω external VDD resistor the part draws <55µA of current into the COM pins and causes no stress/damage to the IC. In addition all switches are OFF and the shorted VBUS voltage will be isolated from getting through to the other side of the switch channels, thereby protecting the USB transceiver. TABLE 2. LOGIC CONTROL VOLTAGE LEVELS VDD SUPPLY RANGE LOGIC = “0” (LOW) LOGIC = “1” (HIGH) OE LP OE LP 2.7V to 3.6V ≤ 0.5V or floating ≤ 0.5V or floating ≥1.4V ≥1.4V 3.7V to 4.2V ≤ 0.7V or floating ≤ 0.7V or floating ≥1.7V ≥1.7V 4.3V to 5.25V ≤ 0.8V or floating ≤ 0.8V or floating ≥2.0V ≥2.0V Typical Performance Curves T A = +25°C, Unless Otherwise Specified FIGURE 9. ON-RESISTANCE vs SUPPLY VOLTAGE vs SWITCH VOLTAGE FIGURE 10. ON-RESISTANCE vs SUPPLY VOLTAGE vs SWITCH VOLTAGE 2.9 3.0 3.1 3.2 3.3 3.4 0 0.1 0.2 0.3 0.4 VCOM (V) 2.7V 3.3V ICOM = 17mA 3.6V 4.3V 5.25V 3.0V 0 2 4 6 8 10 12 14 16 0 0.6 1.2 1.8 2.4 3.0 3.6 VCOM (V) ICOM = 17mA 2.7V 3.0V 3.3V 5.25V |
同様の部品番号 - ISL54227_10 |
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同様の説明 - ISL54227_10 |
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