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