參數(shù)資料
型號: 9880
廠商: Intel Corp.
英文描述: Advanced 10/100 Repeater with Intergrated Management
中文描述: 高級10/100中繼器與綜合管理
文件頁數(shù): 69/118頁
文件大?。?/td> 1648K
代理商: 9880
Advanced 10/100 Repeater with Integrated Management
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
69
4.3.6
LED Circuits
4.3.6.1
Direct Drive LEDs
Each Direct Drive LED has a corresponding open-drain pin. The LEDs are connected, via a current
limiting resistor, to a positive voltage rail. The LEDs are turned on when the output pin drives Low.
The open-drain LED pins are 5V tolerant, allowing use of either a 3.3V or 5V rail. A 5V rail eases
LED component selection by allowing more common, high forward voltage LEDs to be used.
Refer to
Figure 27
for a circuit illustration.
4.3.6.2
LED Pins Multiplexed with Configuration Inputs
Some static configuration inputs are multiplexed with LED pins to reduce the LXT98x0 pin count.
These LED pins are configured by current sinking (open- drain output) and sourcing (open-source
output). If the LED pin sinks the LED current, the configuration value is
1
. If LED pin sources
Figure 25. Serial PROM Interface
Figure 26. Typical Reset Circuit
93CS46
PROM_CS
PROM_CLK
PROM_DTIN
PROM_DTOUT
PROM_DTIN
PROM_CLK
LXT98x0
(ID = 00)
LXT98x0
(ID
00
)
VCC
C
R1
R2
14
D
1. t(CR1 > Power Supply Ramp Up Time. R2 discharges C when supply
goes away. The
14 is needed for multiple LXT98x0 devices.
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