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ST7260 датащи(PDF) 101 Page - STMicroelectronics |
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ST7260 датащи(HTML) 101 Page - STMicroelectronics |
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101 / 117 page ![]() ST7260 101/117 13.10 COMMUNICATION INTERFACE CHARACTERISTICS 13.10.1 USB - Universal Bus Interface (Operating conditions T A = 0 to +70°C, V DD = 4.0 to 5.25V unless otherwise specified) Notes: 1. RL is the load connected on the USB drivers. 2. All the voltages are measured from the local ground potential. 3. To improve EMC performance (noise immunity), it is recommended to connect a 100nF capacitor to the USBVCC pin. Figure 63. USB: Data Signal Rise and Fall Time Table 24. USB: Low-speed Electrical Characteristics Note: 1. For more detailed information, please refer to Chapter 7 (Electrical) of the USB specification (version 1.1). USB DC Electrical Characteristics Symbol Parameter Conditions Min. Max. Unit VDI Differential Input Sensitivity I(D+, D-) 0.2 V 2) VCM Differential Common Mode Range Includes VDI range 0.8 2.5 VSE Single Ended Receiver Threshold 0.8 2.0 VOL Static Output Low RL 1) of 1.5 Kohms to 3.6v 0.3 VOH Static Output High RL 1) of 15 Kohms to VSS 2.8 3.6 USBV USBVCC: voltage level 3) VDD=5 V 3.00 3.60 Differential Data Lines VSS tf tr Crossover points VCRS Symbol Parameter Conditions Min Max Unit Driver characteristics: tr Rise time CL=50 pF 1) 75 ns CL=600 pF 1) 300 ns tf Fall Time CL=50 pF 1) 75 ns CL=600 pF 1) 300 ns trfm Rise/ Fall Time matching tr/tf 80 120 % VCRS Output signal Crossover Voltage 1.3 2.0 V |
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