LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
Table 29. 100BASE-FX Transceiver Characteristics
1
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
Transmitter
Peak differential output voltage
(single ended)
VOP
0.6
–
1.5
V
–
Signal rise/fall time
TRF
–
–
–
–
1.6
1.3
ns
ns
10 <–> 90% 2.0 pF load
Jitter (measured differentially)
–
–
Receiver
Peak differential input voltage
Common mode input range
VIP
0.55
2.25
–
–
1.5
V
V
–
–
VCMIR
VCC - 0.5
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
Table 30. 10BASE-T Transceiver Characteristics
1
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
Transmitter
Peak differential
With specified transformer, line
replaced by 100Ω (±1%) resistor
VOP
2.2
2.5
2.8
V
output voltage
Link transmit period
–
–
8
0
–
24
11
ms
ns
–
Transmit timing jitter added by the
MAU and PLS sections2,3
After line model specified by IEEE
802.3 for 10BASE-T MAU
2
Receiver
Receive input impedance2
Link min receive
ZIN
–
–
2
3.6
–
kΩ
ms
ms
ms
Between TPIP and TPIN
–
7
–
–
–
Link max receive
–
50
50
300
–
–
150
150
585
Time link loss receive
Differential squelch threshold
–
VDS
390
mV Peak 5 MHz square wave input
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
2. Parameter is guaranteed by design; not subject to production testing.
3. IEEE 802.3 specifies maximum jitter addition at 1.5 ns for the AUI cable, 0.5 ns from the encoder, and 3.5 ns from the MAU.
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Datasheet
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