lxt971a Intel Corporation, lxt971a Datasheet - Page 58

• Manufacturer Part Number: lxt971a
• Description: 3.3v Dual-speed Fast Ethernet Phy Transceiver
• Manufacturer: Intel Corporation

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
58
Table 22. I/O Characteristics - LED/CFG Pins
Table 23. I/O Characteristics – SD/TP Pin
Table 24. 100BASE-TX Transceiver Characteristics
Fiber Mode (Register bit 16.0 = 1)
Twisted-Pair Mode (Register bit 16.0 = 0)
Input Low Voltage
Input High Voltage
Input Low Voltage
Input High Voltage
Input Current
Output Low Voltage
Output High Voltage
Peak differential output voltage
Signal amplitude symmetry
Signal rise/fall time
Rise/fall time symmetry
Duty cycle distortion
Overshoot/Undershoot
Jitter (measured differentially)
1. Typical values are for design aid only; not guaranteed and not subject to production testing.
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production
2. Measured at the line side of the transformer, line replaced by 100 : (+/-1%) resistor.
testing.
Parameter
Parameter
Parameter
100BASE-FX Mode Normal Operation – SD Input from Fiber Transceiver
Reset and Power-Up States – FX/TP Mode Configuration
Symbol
Symbol
T
V
V
D
V
V
Vss
T
V
V
RFS
I
OH
OL
–
RF
CD
OS
IH
IL
I
P
Sym
V
V
V
V
FX
TP
IH
IL
Min
0.95
2.0
-10
2.0
Min
3.0
98
35
–
–
–
–
–
1.49
2.14
Min
600
–
Typ
Typ
–
–
–
–
–
50
–
–
–
–
–
–
1600-2400
1
Typ
GND
1.6
2.4
Max
1
0.8
0.4
Max
1.05
10
102
5.0
0.5
1.4
–
–
65
5
Max
1.83
2.42
500
–
Units
Units
P A
V
V
V
V
ns
ns
ns
%
%
%
V
Units
mV
mV
V
V
Offset from 16 ns pulse
Rev. Date: August 7, 2002
width at 50% of pulse
Test Conditions
0 < V
Test Conditions
I
I
OH
Test Conditions
OL
Document #: 249414
VCCD = 3.3 V
VCCD = 3.3 V
Note 2
Note 2
Note 2
Note 2
= -10 mA
I
= 10 mA
peak
< VCCIO
Revision #: 002
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Datasheet
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