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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MB9B360R 데이터시트(PDF) 147 Page - Cypress Semiconductor |
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MB9B360R 데이터시트(HTML) 147 Page - Cypress Semiconductor |
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147 / 166 page  Document Number: 002-04872 Rev.*A Page 147 of 166 MB9B360R Series *6 : USB Full-speed connection is performed via twist pair cable shield with 90 Ω ± 15% characteristic impedance (Differential Mode). USB standard defines that output impedance of USB driver must be in range from 28 Ω to 44Ω. So, discrete series resistor (Rs) addition is defined in order to satisfy the above definition and keep balance. When using this USB I/O, use it with 25 Ω to 30Ω (recommendation value 27Ω) Series resistor Rs. Rs series resistor 25Ω to 30Ω Series resistor of 27Ω (recommendation value) must be added. And, use "resistance with an uncertainty of 5% by E24 sequence". *7 : They indicate rising time (Trise) and falling time (Tfall) of the low-speed differential data signal. They are defined by the time between 10% and 90% of the output signal voltage. See “Low-Speed Load (Compliance Load)" for conditions of external load. Mount it as external resistance. 28Ω to 44Ω Equiv. Imped. 28Ω to 44Ω Equiv. Imped. Rising time Falling time |
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