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參數(shù)資料
| 型號： | MIC2551 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | USB TRANSCEIVER |
| 中文描述： | USB收發(fā)器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 79K |
| 代理商： | MIC2551 |
May 2004
9
M9999-051004
MIC2551A
Micrel
Configuration Mode
VBUS/VTRM
VIF
Notes
Normal
Connected
Connected
Normal supply configuration and operation.
Disconnect
(D+/D
–
sharing)
Open
Connected
VP/VM are HIGH outputs, RCV is LOW.
With OE# = 0 and SUS = 1, data lines may be driven with
external devices up to 3.6V.
With D+, D
–
floating, I
IF
draws less than 1
μ
A.
VP/VM are HIGH outputs, RCV is LOW.
With D+, D
–
floating, I
IF
draws less than 1
μ
A.
Logic controlled inputs pins are Hi-Z.
Disconnect
Ground
Connected
Disable Mode
Connected
Open
Prohibited
Connected
Ground
Prohibited condition.
Table 3. Power Supply Configuration
PCB Layout Recommendations
Although the USB standard and applications are not based in
an impedance controlled environment, a properly designed
PCB layout is recommended for optimal transceiver perfor-
mance. The suggested PCB layout hints are as follows:
Match signal line traces (VP/VM, D+, D
–
) to
40ps, approximately
1
/
3
inch if possible. FR-4
PCB material propagation is about 150ps/inch,
so to minimize skew try to keep VP/VM, D+/D
–
traces as short as possible.
For every signal line trace width (w), separate
the signal lines by 1.5
–
2 widths. Place all other
traces at >2 widths from all signal line traces.
Maintain the same number of vias on each
differential trace, keeping traces approximately
at same separation distance along the line.
Control signal line impedances to
±
10%.
Keep R
S
as close to the IC as possible, with
equal distance between R
S
and the IC for both
D+ and D
–
.
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