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USB2240 数据表(PDF) 31 Page - Microchip Technology |
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USB2240 数据表(HTML) 31 Page - Microchip Technology |
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31 / 43 page ![]() 2010 - 2015 Microchip Technology Inc. DS00001979A-page 31 USB224X 9.0 DC PARAMETERS 9.1 Maximum Ratings Note 9-1 Stresses above the specified parameters may cause permanent damage to the device. This is a stress rating only and functional operation of the device at any condition above those indicated in the operation sections of this specification is not implied. Note 9-2 When powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. When this possibility exists, it is suggested that a clamp circuit be used. Parameter Symbol MIN MAX Units Comments Storage Temperature TA -55 150 °C Lead Temperature °C Please refer to JEDEC specification J-STD-020D. 3.3 V supply voltage VDD33 -0.5 4.0 V Voltage on USB+ and USB- pins -0.5 (3.3 V supply voltage + 2) ≤ 6V Voltage on CRD_PWR -0.5 VDD33 + 0.3 V When internal power FET operation of this pin is enabled, this pin may be simultaneously shorted to ground or any voltage up to 3.63 V indefinitely, without damage to the device as long as VDD33 and VDDA33 are less than 3.63 V and TA is less than 70 oC. Voltage on any signal pin -0.5 VDD33 + 0.3 V Voltage on XTAL1 -0.5 3.6 V Voltage on XTAL2 -0.5 VDD18 + 0.3 V FIGURE 9-1: SUPPLY RISE TIME MODEL t10% 10% 90% Voltage tRT t90% Time 100% 3.3 V VSS VDD33 |
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