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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7263BHX датащи(PDF) 123 Page - STMicroelectronics |
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ST7263BHX датащи(HTML) 123 Page - STMicroelectronics |
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123 / 145 page  ST7263BDx ST7263BHx ST7263BKx ST7263BE 123/145 14.10 Communication interface characteristics 14.10.1 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 72. USB: data signal rise and fall time Table 27. 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 1.5K ohms to 3.6v 0.3 VOH Static Output High RL 1) of 15K ohms to VSS 2.8 3.6 USBV USBVCC: voltage level 3) VDD=5v 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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