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參數(shù)資料
| 型號(hào)： | 9883 |
| 廠商： | Intel Corp. |
| 英文描述： | Advanced 10/100 Umnmanaged Repeater |
| 中文描述： | 高級(jí)10/100 Umnmanaged直放站 |
| 文件頁數(shù)： | 41/56頁 |
| 文件大?。?/td> | 719K |
| 代理商： | 9883 |
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Advanced 10/100 Unmanaged Repeater
—
LXT9883/9863
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
41
4.3
Inter-Repeater Backplane Compatibility
The Inter-repeater Backplane (IRB) comprises two parts:
Local
—
the backplane between cascaded devices on the same board.
Stack
—
the backplane between multiple boards.
Each of these backplanes consists of both analog and digital signals.
4.3.1
Local Backplane
—
3.3V Only
The LXT98x3 local backplane operates at 3.3V only. LXT98x and LXT91x devices operate at 5V.
LXT98x3 devices are, therefore, not cascadable with LXT98x and LXT91x devices.
Note:
Do not mix LXT98x3 with either LXT98x or LXT91x devices on the local backplanes.
4.3.2
Stack Backplane
—
3.3V or 5V
The LXT98x3 stack backplanes can be configured to be either 3.3V or 5V. COMP_SEL (Pin 39), a
special input pin, selects between the two voltage modes, depending on whether 3.3V or 5V is
applied.
4.3.2.1
3.3V-Only Stacks
Apply 3.3V to COMP_SEL, IR100CFSBP, IR10CFSBP, and IR10COLBP for LXT98x3 backplane
operation
4.3.2.2
For 5V Backwards Stackability
Apply 5V to COMP_SEL, IR100CFSBP, IR10CFSBP, and IR10COLBP for LXT98x and LXT91x
backplane operation.
Note:
With either mode (3.3V or 5V), COMP_SEL draws less than 3 mA.
1. The external pull-up resistor values remain the same, regardless of 3.3V or 5V backplane
operation.
2. The recommended digital signal external buffer has been changed to 74LVT245 for the
LXT98x3.
4.3.2.3
3.3V and 5.0V Stacking Boards Cannot Be Mixed
4.3.2.3.1
3.3V Operation
Boards designed for 3.3V backplane operation should only be stacked with other 3.3V boards.
Existing LXT98x or LXT91x based designs cannot operate in 3.3V.
4.3.2.3.2
Incompatible Stacking Configurations
The following stacking configurations are incompatible:
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