MB9B500B datasheet(96/113 Pages) SPANSION

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D a t a S h e e t

December 15, 2014, MB9B500B-DS706-00021-3v0-E

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 28Ωto 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.

*7 : They indicate rise time (Trise) and fall 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.

Trise

10%

90%

Tfall

Rising time

Falling time

D-

D+

10%

90%

Full-speed Buffer

TxD+

TxD-

3-State Enable

28Ω to 44Ω Equiv. Imped.

Mount it as external resistance.

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".

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