LXT972A datasheet(46/70 Pages) INTEL

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LXT972A — 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet

Datasheet

Table 22. 100BASE-TX Transceiver Characteristics

Parameter

Sym

Min

Typ

Max

Units

Test Conditions

Peak differential output voltage

0.95

–

1.05

Note 2

Signal amplitude symmetry

Vss

–

102

Note 2

Signal rise/fall time

TRF

3.0

–

5.0

Note 2

Rise/fall time symmetry

TRFS

––

0.5

Note 2

Duty cycle distortion

DCD

Offset from 16ns pulse width at

50% of pulse peak

Overshoot/Undershoot

VOS

––

–

Jitter (measured differentially)

–––

1.4

–

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

Ω(+/-1%) resistor.

Table 23. 10BASE-T Transceiver Characteristics

Parameter

Sym

Min

Typ

Max

Units

Test Conditions

Transmitter

Peak differential output voltage

VOP

2.2

2.5

2.8

With transformer, line

replaced by 100

Ω

resistor

Transition timing jitter added by the

MAU and PLS sections

-0

After line model

specified by IEEE 802.3

for 10BASE-T MAU

Receiver

Receive Input Impedance

ZIN

Ω

Differential Squelch Threshold

VDS

300

420

585

Table 24. 10BASE-T Link Integrity Timing Characteristics

Parameter

Sym

Min

Typ

Max

Units

Test Conditions

Time Link Loss Receive

TLL

–

150

–

Link Pulse

TLP

–

Link Pulses

–

Link Min Receive Timer

TLR MIN

–

7ms

–

Link Max Receive Timer

TLR MAX

–

150

–

Link Transmit Period

Tlt

–

Link Pulse Width

Tlpw

–

150

–

1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

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