LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
61
Table 29. 10 Mbps IRB Electrical Characteristics
Parameter
Symbol
Min
Typ
1
Max
Units
Test Conditions
Output Low voltage
V
OL
0
.1
.4
V
R
L
= 330
Output rise or fall time
T
RF
–
4
10
ns
C
L
= 15 pF
Input High voltage
V
IH
V
CC
- 2.0
–
–
V
CMOS inputs
V
CC
- 2.0
–
–
V
IR10CLK (Schmitt trigger)
Input Low voltage
V
IL
–
–
2.0
V
CMOS inputs
–
–
1.0
V
IR10CLK (Schmitt trigger)
Hysteresis voltage
–
0.5
–
–
V
IR10CLK (Schmitt trigger)
IR10CFS current
single drive
–
–
3.2
–
mA
R
L
= 680
collision
–
–
6.6
–
mA
R
L
= 680
IR10CFSBP current
single drive
–
–
8.1
–
mA
R
L
= 330
collision
–
–
17.0
–
mA
R
L
= 330
IR10CFS/BP voltage
single drive
–
1.9
2.8
3.2
V
–
collision
–
.25
0.6
0.8
V
–
1. Typical values are at 25
°
C and are for design aid only; they are not guaranteed and not subject to production testing.
Table 30. 100BASE-TX Transceiver Electrical Characteristics
Parameter
Symbol
Min
Typ
1
Max
Units
Test Conditions
Peak differential output voltage
(single ended)
V
P
0.95
1.0
1.05
V
Note 2
Signal amplitude symmetry
–
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
Duty cycle distortion
–
–
–
+/- 0.5
ns
Offset from 8 ns 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 line side of transformer, line replaced by 100
(±.1%) resistor.
Table 31. 100BASE-FX Transceiver Electrical Characteristics
Parameter
Symbol
Min
Typ
1
Max
Units
Test Conditions
Transmitter
Peak differential output voltage
(single ended)
V
OP
0.6
–
1.0
V
–
Signal rise/fall time
T
RF
–
–
1.6
ns
10 <-> 90%, 2.0 pF load
Jitter (measured differentially)
–
–
–
1.3
ns
–
1. Typical values are at 25
°
C and are for design aid only; not guaranteed and not subject to production testing.