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LXT975B Datasheet(PDF) 51 Page - Intel Corporation

Part # LXT975B
Description  Fast Ethernet 10/100 Quad Transceivers
PDF  74 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

LXT975B Datasheet(HTML) 51 Page - Intel Corporation

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Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
Datasheet
51
Table 25. Digital I/O Characteristics - MII Pins)
Parameter
Symbol
Min
Typ
Max
Units
Test Conditions
Input Low voltage
VIL
––
.8
V
–
Input High voltage
VIH
2.0
––
V
–
Input current
II
-100
–
100
µA0.0 < VI < VCC
Output Low voltage
VOL
––
0.4
V
IOL = 4 mA
Output High voltage
VOH
2.2
––
VIOH = -4 mA, VCC = 3.3V
VOH
2.4
––
VIOH = -4 mA, VCC = 5.0V
Driver output resistance
(Line driver output enabled)
RO1
50
100
200
Ω
VCC = 3.3V
RO1
50
100
200
Ω
VCC = 5.0V
1. Parameter is guaranteed by design; not subject to production testing.
Table 26. Required CLK25M Characteristics
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
Input Low voltage
VIL
––
.8
V
–
Input High voltage
VIH
2.0
––
V
–
Input clock frequency tolerance1
∆f
––
± 100
ppm
Clock frequency is 25 MHz
Input clock duty cycle1
Tdc
40
–
60
%
–
1. Parameter is guaranteed by design; not subject to production testing.
Table 27. Low-Voltage Fault Detect Characteristics
Parameter
Sym
Min
Typ
1
Max
Units
Test Conditions
Detect fault threshold
VLT
3.4
–
4.0
V
–
Clear fault threshold
VLH
4.1
–
4.7
V
–
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
Table 28. 100BASE-TX Transceiver Characteristics
Parameter
Sym
Min
Typ
1
Max
Units
Test Conditions
Peak differential output voltage
VP
0.95
–
1.05
V
Note 2
Signal amplitude symmetry
Vss
98
–
102
%
Note 2
Signal rise/fall time
TRF
3.0
–
5.0
ns
Note 2
Rise/fall time symmetry
TRFS
––
0.5
ns
Note 2
Jitter (measured differentially)
––
0.7
1.4
ns
–
Duty cycle distortion
–––
+/- 0.5
ns
Offset from 16ns pulse width at
50% of pulse peak
Overshoot
VO
––
5%
–
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
2. Measured at the line side of the transformer, line replaced by 100
Ω(+/-1%) resistor.



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