LXT908KCA4SE000 データシートの表示（PDF） - Intel
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LXT908KCA4SE000 Datasheet PDF : 44 Pages
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Universal 3.3V 10BASE-T and AUI Transceiver — LXT908
Status outputs are grouped at the lower left of the diagram. Line status outputs drive LED
indicators and the Jabber and Polarity status indicators are available, as required.
Power and ground pins are shown at the bottom of the diagram. A single-power supply is used for
both VCC1 and VCC2, with a decoupling capacitor installed between the power and ground
busses.
An additional power and ground pin (VCCA and GNDA) is supported in designs using the 64-pin
LQFP package. A single-power supply is used for all three power and ground pins (VCC1, VCC2,
VCCA) and (GND1, GND2, GNDA). Please install a decoupling capacitor between each power
and ground buss.
The twisted-pair and AUI interfaces are shown at the upper and lower right of the diagram,
respectively. Impedance matching resistors for 100 UTP are installed in each I/O pair, but no
external filters are required.
Figure 9. LAN Adapter Board - Auto Port Select with External Loopback Control
NS8390 BACK-END
CONTROLLER
INTERFACE
LOOPBACK
ENABLE
PROGRAMMING
OPTIONS
20 pF
20 pF
20 MHz
TXD
TXE
TXC
RXC
RXD
CRS
COL
LBK
CLKI
TXD
TEN
TCLK
RCLK
RXD
CD
COL
LBK
CLKO
TPIN
TPIP
TPONB
TPONA
PAUI
AUTOSEL
NTH
DSQE
LI
TPOPB
TPOPA
1 1 : 1 16
100 Ω
3
14
11.5 Ω 1% 6 1 : 2 11
220pF
11.5 Ω 1% 8
9
RJ45
6
5
4
3
2
1
MODE SELECT
LINE STATUS
330 330 330 330
Green Red Red Red
MD2
MD1
MD0
JAB
PLR
LEDC/FDE
LEDR
LEDT/PDN
LEDL
TEST
78 Ω
1
16
CIN
2
15
CIP
78 Ω 4
13
DON
5
12
DOP
DIN 78 Ω 7
10
8
9
DIP
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
+3.3V
0.1 µF
VCC1
VCC2
12.4 kΩ
RBIAS
1%
GND1 GND2
1
Chassis
Gnd
Fuse
+ 12 V
1 Bias resistor RBIAS should be located close to the pin and isolated from other signals.
Datasheet
19
Document #: 249049
Revision #: 002
Rev. Date: June 19, 2001
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