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LXT970ATC 数据表(PDF) 46 Page - Intel Corporation

部件名 LXT970ATC
功能描述  Dual-Speed Fast Ethernet Transceiver
PDF  74 Pages
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制造商  INTEL [Intel Corporation]
网页  http://www.intel.com
标志 INTEL - Intel Corporation

LXT970ATC 数据表(HTML) 46 Page - Intel Corporation

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LXT970A — Dual-Speed Fast Ethernet Transceiver
46
Datasheet
Figure 21. Typical Interface Circuitry
LXT970A
25.0 MHz
C1
C2
XI
TX_EN
TPIN
TPIP
RJ45
RBIAS
GNDD
TXD<4:0>
TX_CLK
TX_ER
COL
RX_DV
RX_ER
RX_CLK
RXD<4:0>
CRS
MDIO
FDS/MDINT
MDC
MII
Data
I/F
+5 V
VCCD
XO
TPON
50
Ω
1%
TPOP
50
Ω
1%
50
Ω
50
Ω
50
Ω
75
Ω
50
Ω
50
Ω
TREF
VCCIO
+3.3V
or
+5V
GNDIO
50
Ω
6
5
4
3
2
1
8
7
VCCT
GNDT
FIBON
191
W
FIBOP
FIBIN
FIBIP
191
W
69
W
69
W
Fiber Txcvr
.01
mF
130
W
130
W
80
W
80
W
+5 V
.01
mF
TD
TD
RD
RD
3
2
1
VCCA
GNDA
TEST
LEDS
LEDR
LEDT
LEDL
LEDC
330
W
330
W
330
W
330
W
330
W
+5 V
75
Ω
VCCR
GNDR
.01
µF
.01
µF
MF<4:0>
CFG<1:0>
RESET
PWRDWN
H/W
Control
I/F
FDE
TRSTE
MDDIS
MII
Control
I/F
.01
µF
.01
µF
0.001
µF/2kV
.01
µF.01µF
22.1k
Ω 1%
.01
µF
.01
mF
10
µF
GNDD
GNDD
GNDA
GNDA
GNDA
GNDA
VCCR
GNDD
VCCD
Ferrite Bead
+5 V
10
µF
VCCA
GNDA
10
µF
+
+
4
VCCT +5 V
+
.01
mF
50
Ω
1%
50
Ω
1%
.01
µF
GNDR
5
6
7
55
Ω
55
Ω
55
Ω
55
Ω
55
Ω
55
Ω
55
Ω
1. Refer to Table 19 and Table 20 for crystals.
2. Refer to Table 18 for magnetics.
3. Refer to fiber transceiver manufacturers recommendations for termination circuitry. Suitable fiber transceivers include:
HFBR-5103 and HFBR-5105.
4. Bypassing to chassis ground (if available) provides additional EMI shielding.
5. If the fiber interface is not used, FIBIN, FIBIP, FIBON, and FIBOP may be left unconnected.
6. Placement of this cap should be verified for each application. This cap typically reduces error rates at long line lengths but
is implementation specific.
7. If bit 17.3 = 0, series terminations resistors are recommended for all MII outputs. The proper value is application specific.
If bit 17.3 = 1, termination resistors are not required.



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