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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MB9B520M датащи(PDF) 91 Page - SPANSION |
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MB9B520M датащи(HTML) 91 Page - SPANSION |
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91 / 113 page  D a t a S h e e t 88 MB9B520M_DS706-00048-3v0-E, March 18, 2015 CONFIDENTIAL *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 44 Ω. 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 30 Ω (recommendation value 27 Ω) Series resistor Rs. Rs series resistor 25Ω to 30Ω Ser ies 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 the external load. Mount it as external resistor. 28Ω to 44Ω Equiv. Imped. 28Ω to 44Ω Equiv. Imped. Rising time Falling time |
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