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MB9B320TA Datasheet(PDF) 124 Page - SPANSION |
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MB9B320TA Datasheet(HTML) 124 Page - SPANSION |
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124 / 141 page ![]() D a t a S h e e t January 30, 2015, MB9B320TA_DS706-00062-2v0-E 121 CONFIDENTIAL *6 : USB Full-speed connection is performed via twist pair cable shield with 90Ω ± 15% characteristic impedance (Differential Mode). USB standard defines that output impedance of USB driver must be in range from 28Ω 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 25Ω 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 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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