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STR71XF 数据表(PDF) 65 Page - STMicroelectronics |
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STR71XF 数据表(HTML) 65 Page - STMicroelectronics |
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65 / 78 page ![]() STR71xF Electrical parameters 65/78 4.3.10 USB characteristics The USB interface is USB-IF certified (Full Speed). Figure 37. USB: data signal rise and fall time Table 39. USB startup time Symbol Parameter Conditions Max Unit tSTARTUP USB transceiver startup time 1 µs Table 40. USB DC characteristics Symbol Parameter Conditions Min.(1)(2) 1. All the voltages are measured from the local ground potential. 2. It is important to be aware that the DP/DM pins are not 5 V tolerant. As a consequence, in case of a a shortcut with Vbus (typ: 5.0V), the protection diodes of the DP/DM pins will be direct biased . This will not damage the device if not more than 50 mA is sunk for longer than 24 hours but the reliability may be affected. Max.(1)(2) Unit Input Levels VDI Differential Input Sensitivity I(DP, DM) 0.2 V VCM Differential Common Mode Range Includes VDI range 0.8 2.5 VSE Single Ended Receiver Threshold 1.3 2.0 Output Levels VOL Static Output Level Low RL of 1.5 kΩ to 3.6V (3) 3. RL is the load connected on the USB drivers 0.3 V VOH Static Output Level High RL of 15 kΩ to VSS (3) 2.8 3.6 Table 41. USB: Full speed driver electrical characteristics Symbol Parameter Conditions Min Max Unit tr Rise time(1) 1. Measured from 10% to 90% of the data signal. For more detailed information, please refer to USB Specification - Chapter 7 (version 2.0). CL=50 pF 420 ns tf Fall Time1) CL=50 pF 4 20 ns trfm Rise/ Fall Time matching tr/tf 90 110 % VCRS Output signal Crossover Voltage 1.3 2.0 V Differential Data Lines VSS tf tr Crossover points VCRS |
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