LAN8742AI-CZ datasheet(107/124 Pages) MICROCHIP

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DS00001989A-page 107

LAN8742A/LAN8742Ai

Note 1: This specification applies to all inputs and tri-stated bi-directional pins. Internal pull-down and pull-up resis-

tors add ±50 µA per-pin (typical).

Note 1: Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor.

2: Offset from 16 ns pulse width at 50% of pulse peak.

3: Measured differentially.

Note 1: Min/max voltages guaranteed as measured with 100 Ω resistive load.

TABLE 5-7:

VARIABLE I/O BUFFER CHARACTERISTICS

Parameter

Symbol

Min.

1.8 V

Typ.

2.5 V

Typ.

3.3 V

Typ.

Max.

Unit

Note

VIS Type Input Buffer

Low Input Level

High Input Level

Neg-Going Threshold

Pos-Going Threshold

Schmitt Trigger Hystere-

sis (VIHT - VILT)

Input Leakage

(VIN = VSS or VDDIO)

Input Capacitance

VILI

VIHI

VILT

VIHT

VHYS

IIH

CIN

-0.3

0.64

0.81

102

-10

0.83

0.99

158

1.15

1.29

136

1.41

1.65

138

3.6

1.76

1.90

288

µA

Schmitt trigger

(see Note 1)

VO8 Type Buffers

Low Output Level

High Output Level

VOL

VOH

VDDIO - 0.4

0.4

IOL = 8 mA

IOH = -8 mA

VOD8 Type Buffer

Low Output Level

VOL

0.4

IOL = 8 mA

TABLE 5-8:

100BASE-TX TRANSCEIVER CHARACTERISTICS

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Peak Differential Output Voltage High

VPPH

950

1050

mVpk

(see Note 1)

Peak Differential Output Voltage Low

VPPL

-950

-1050

mVpk

(see Note 1)

Signal Amplitude Symmetry

VSS

102

(see Note 1)

Signal Rise and Fall Time

TRF

3.0

5.0

(see Note 1)

Rise and Fall Symmetry

TRFS

0.5

(see Note 1)

Duty Cycle Distortion

DCD

(see Note 2)

Overshoot and Undershoot

VOS

Jitter

1.4

(see Note 3)

TABLE 5-9:

10BASE-T TRANSCEIVER CHARACTERISTICS

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter Peak Differential Output Voltage

VOUT

2.2

2.5

2.8

(see Note 1)

Receiver Differential Squelch Threshold

VDS

300

420

585

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