MB9B520M datasheet(91/113 Pages) SPANSION

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D a t a S h e e t

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.

Rising time

Falling time

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