LXT972 Level One, LXT972 Datasheet - Page 38

• Manufacturer Part Number: LXT972
• Description: 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
• Manufacturer: Level One

LXT972 3.3V Dual-Speed Fast Ethernet Transceiver
Table 21: I/O Characteristics - LED/CFG Pins
Table 22: 100BASE-TX Transceiver Characteristics
Table 23: 10BASE-T Transceiver Characteristics
38
Output Low Voltage
Output High Voltage
Input Current
Peak differential output voltage
Signal amplitude symmetry
Signal rise/fall time
Rise/fall time symmetry
Duty cycle distortion
Overshoot/Undershoot
Jitter (measured differentially)
Peak differential output voltage
Transition timing jitter added by the
MAU and PLS sections
Receive Input Impedance
Differential Squelch Threshold
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 (+/-1%) resistor.
Parameter
Parameter
Parameter
Sym
Sym
V
-
Z
V
T
D
V
V
T
V
Vss
V
RFS
OP
IN
I
DS
OL
OH
–
RF
CD
OS
Sym
I
P
0.95
Min
Min
3.0
-10
2.4
98
35
–
–
–
–
Min
300
2.2
Transmitter
0
-
Receiver
Typ
Typ
50
–
–
–
–
–
–
–
–
–
1
Typ
420
2.5
2
-
Max
Max
1.05
102
5.0
0.5
1.4
0.4
10
5
–
Units
Max
Units
585
2.8
22
11
ns
ns
ns
%
%
%
V
V
V
A
Offset from 16ns pulse width at
50% of pulse peak
I
I
0 < V
OL
OH
Units
mV
k
ns
V
= 10 mA
= -10 mA
I
< VCCIO
Test Conditions
Test Conditions
With transformer, line
replaced by 100
resistor
After line model spec-
ified by IEEE 802.3
for 10BASE-T MAU
Test Conditions
Note 2
Note 2
Note 2
Note 2
–
–