SMSC LAN8720i User Manual

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Revision 1.0 (05-28-09)

72

SMSC LAN8720/LAN8720i

Measured at the line side of the transformer, line replaced by 100

Ω (± 1%) resistor.

Offset from 16 nS pulse width at 50% of pulse peak

Measured differentially.

Min/max voltages guaranteed as measured with 100

Ω resistive load.

RXD1/MODE1

Pull-up

RXER/PHYAD0

Pull-down

CRS_DV/MODE2

Pull-up

LED1/REGOFF

Pull-down

LED2/nINTSEL

Pull-up

MDIO

Pull-up

nINT/REFCLKO

Pull-up

nRST

Pull-up

Peak Differential Output Voltage High

V

PPH

950

-

1050

mVpk

Peak Differential Output Voltage Low

V

PPL

-950

-

-1050

mVpk

Signal Amplitude Symmetry

V

SS

98

-

102

%

Signal Rise & Fall Time

T

RF

3.0

-

5.0

nS

Rise & Fall Time Symmetry

T

RFS

-

-

0.5

nS

Duty Cycle Distortion

D

CD

35

50

65

%

Overshoot & Undershoot

V

OS

-

-

5

%

Jitter

1.4

nS

Transmitter Peak Differential Output Voltage

V

OUT

2.2

2.5

2.8

V

Receiver Differential Squelch Threshold

V

DS

300

420

585

mV