參數(shù)資料
型號: MB91F312APFV-1XX-BND-E1
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 40.54 MHz, RISC MICROCONTROLLER, PQFP144
封裝: 20 X 20 MM, 0.50 MM PITCH, LEAD FREE, PLASTIC, LQFP-144
文件頁數(shù): 46/68頁
文件大?。?/td> 14737K
代理商: MB91F312APFV-1XX-BND-E1
MB91310 Series
50
DS07-16505-3E
(Continued)
*3 : About driver characteristic ZDRV
USB full-speed connection is made by the twisted pair cable shielded at a characteristic impedance (Z0) of
90
± 15%. The USB Specification stipulates that the USB driver output impedance be within the range of
28
to 44 . The USB Specification also stipulates that a discrete serial resistor (Rs) be added for balancing
purposes while satisfying the above standards.
The output impedance of the USB I/O buffer in this LSI is about 3
to 19 .
As the serial resistor Rs, therefore, a 25
to 30 type (27 type recommended) should be added.
T
×D+
T
×D
3-State
Rs
28
to 44 Equiv. Imped.
28
to 44 Equiv. Imped.
Driver output impedance 3
to 19
Rs 25
to 30 (recommended value: 27 )
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