ACTIVE PERFORMANCE SPECIFICATIONS

1000Base-T RJ-45 Gigabit

Ethernet SFP Copper

Transceiver

74741

Module Specifications - Recommended Operating Conditions

PARAMETERS

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Storage Temperature

Tstg

-40

85

Ambient Operating Temperature

Ta

0

70

Supply Voltage

3.13

3.3

3.47

Vdc

Vcc-ground

Supply Current

Icc

285

300

mA

Surge Current

Isurge

TBD

mA

Surge above steady

state value

SFP Host Serial Interface (TX/RX)

Data Input/Output Type

LVDS, AC coupled

Impedance (SERDES Interface)

100

ohms

Differential

Transmitter (Input to SFP)

Input Voltage

400

2400

mVpp

Receiver (Output to SERDES)

Output Voltage

875

1525

mVpp

Max Off Voltage

170

mVpp

Rise Time, 20%–80%

100

200

ps

Total Jitter

80

120

ps

Skew

15

30

ps

IMPEDANCE MATCHING AND POWER SUPPLY FILTERING

The SFP transceiver module’s signal inputs/outputs are AC coupled and internally terminated to 100 ohms (TD+, TD-, RD+, RD-). Each leg of the differential pair is equally

matched in length to reduce signal skew.

Figure 2. Recommended Host Board Supply Filtering Network

VccT

VccR

SFP Module

0.1µF

0.1µF

10µF

1.0µH

1.0µH

0.1µF

10µF

3.3V