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MB9B500B Datasheet(PDF) 96 Page - SPANSION

Part # MB9B500B
Description  This document states the current technical specifications regarding
PDF  113 Pages
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
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MB9B500B Datasheet(HTML) 96 Page - SPANSION

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D a t a S h e e t
December 15, 2014, MB9B500B-DS706-00021-3v0-E
93
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
Rs
Rs
TxD+
TxD-
3-State Enable
28Ω to 44Ω Equiv. Imped.
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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