參數(shù)資料
型號: MB91F312A
廠商: Fujitsu Limited
英文描述: Proprietary 32-bit Microcontroller CMOS
中文描述: 專有的32位微控制器的CMOS
文件頁數(shù): 51/59頁
文件大小: 599K
代理商: MB91F312A
MB91310 Series
51
*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
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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