FEATURES AND SPECIFICATIONS
The 1000Base-T RJ-45 Gigabit Ethernet SFP copper transceiver module is a high
performance integrated duplex data link for bi-directional communication over Category 5
copper cable. The hot pluggable feature allows changing to and from another SFP
compatible module without having to remove system power. Serial ID is included.
Molex's RJ-45 SFP module provides multiple customer friendly features. A link monitor
detects loss of signals. The Serial ID allows individual identification of each SFP
transceiver. An auto-power saving mode conserves energy. The centered RJ-45 modular
jack conforms to a 1U rack for ease of installation. Design allows stacking side by side for
increased density.
Features and Benefits
■
1000Base-T compliant module meets
IEEE802.3z, ab, u specifications and is
SFP MSA compliant
■
Less than 1 Watt power requirement
provides low heat output
■
Zinc back shells provide improved EMI
performance
■
Auto-negotiation feature allows
networking equipment to
automatically determine and adjust to
the required settings
■
Automatic MDI crossover eliminates
the need for crossover cables or cross-
wired (MDIX) ports
■
Bail latch provides ease of extraction
Applications
■
Networking
■
Switches
■
Routers
Specifications
Reference Information
Packaging: Box
Mates With: SFP Cage 73927 series
SFP Connector 74441 series
Electrical
Voltage: 3.3V
Current: 285mA
Power: 1 W max.
Physical
Diecast Backshell: Zinc
PCB Thickness: .039”
Operating Temperature: 0 to +70°C
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
ORDERING INFORMATION
Order No.
74741-0001
74741-0002
Description
1000Base-T RJ-45 Gigabit Ethernet SFP Copper Transceiver, LOS Toggle
1000Base-T RJ-45 Gigabit Ethernet SFP Copper Transceiver, LOS GND
SFP 1000BASE-T RJ-45 OVERVIEW
Switch Board
SFP Adapter
Transformer
MAC
TBI
SERDES
Serial
Interface
SFP Host
Interface
Serial
Interface
1000Base-T
Transceiver
RJ-45
Figure 1. RJ-45 SFP 1000Base-T Application
SFP 1000BASE-T RJ-45 FEATURES
SFP Mode
Automatic MDI Crossover
When the internal Gigabit Ethernet transceiver (PHY)
is configured to SFP mode, the PHY interfaces directly
with the host serial/deserial (SERDES) interface. The
host interface transmits and receives serial data
differentially at 1.25Gbps. The copper interface is full
featured and advertises full/half duplex, and
1000Base-T wire speed.
Auto-Negotiation
The SFP 1000Base-T transceiver performs a MDI
crossover during Auto-Negotiation eliminating the
need for crossover cables or cross-wired (MDIX) ports.
Automatic Polarity Correction
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
Should the polarity of receive signals inadvertently
become reversed, the SFP 1000Base-T will
automatically correct them based on the sequence of
idle signals received
Auto Power Savings Mode
The CAT-5 copper link negotiates according to the IEEE
802.3 Clause 28, and the SERDES interface negotiates
using Clause 37. The two interfaces advertise
1000Base-T full-duplex, and master/slave
relationships. The master establishes the time control
from its local clock source. The slave however recovers
the clock from the received data stream. The SFP
application is limited to 1000Base-T wire speed only.
Auto-Negotiation on the SERDES link is always
restarted when a change is detected on copper link.
The SFP 1000Base-T features a Serial Interface
(SerDes) Auto-Negotiation Bypass mode. This mode
disables auto-negotiation after 200ms of unsuccessful
attempts with the host, without the need for manually
configuring the auto-negotiation parameters. The
Molex SFP 1000Base-T module will transmit data with
auto-negotiation disabled.
AUTO-NEGOTIATION SUMMARY
Auto-Negotiation Features Implemented:
General:
■
■
When the copper link is lost, the SFP automatically
enters a low power mode reducing the chip power
requirements. Full power mode resumes once the
copper link is re-established.
Serial ID
Serial identification is implemented on the SFP
1000Base-T transceiver. The serial protocol uses a
two-wire I2C interface.
Software Reconfigurable
The SFP 1000Base-T is hardware configured on power-
up. The configuration can be changed by a register
write via a two-wire bus (I2C) at any time. For further
detail, refer to the Molex SFP 1000Base-T software
configuration application note.
Host SERDES Interface:
■
■
■
■
SERDES Auto-Negotiation is restarted when a change
is detected on the copper link
Auto power savings mode when copper link is lost
Auto-Negotiation
Copper SFP speed 1000Base-T
Full duplex
Automatic MDI Crossover
Master/slave relationships
Pause flow control
Software reconfigurable
Copper RJ-45 Interface:
■
■
■
■
■
■
■
Differential SERDES interface at 1.25Gpbs
Master/slave relationships
SERDES recovers the clock from the received data
stream
Pause flow control
ACTIVE PERFORMANCE SPECIFICATIONS
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
MIN
-40
0
3.13
TYP
MAX
85
70
3.47
300
TBD
UNITS
°
C
°
C
Vdc
mA
mA
NOTES
SYMBOL
Tstg
Ta
V
DD
R, V
DD
T
Icc
Isurge
Module Specifications - Recommended Operating Conditions
PARAMETERS
Storage Temperature
Ambient Operating Temperature
Supply Voltage
Supply Current
Surge Current
SFP Host Serial Interface (TX/RX)
Data Input/Output Type
Impedance (SERDES Interface)
Transmitter (Input to SFP)
Input Voltage
Receiver (Output to SERDES)
Output Voltage
Max Off Voltage
Rise Time, 20%–80%
Total Jitter
Skew
3.3
285
Vcc-ground
Surge above steady
state value
100
ohms
LVDS, AC coupled
Differential
400
2400
mVpp
875
100
80
15
1525
170
200
120
30
mVpp
mVpp
ps
ps
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.
VccT
0.1µF
1.0µH
VccR
0.1µF
10µF
1.0µH
0.1µF
10µF
3.3V
SFP Module
Figure 2. Recommended Host Board Supply Filtering Network
SFP HOST CONNECTOR PIN DESCRIPTIONS
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
DESCRIPTION
SFP Host Connect Electrical Interface, Pin Descriptions
PIN
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
PIN 9
PIN 10
PIN 11
PIN 12
PIN 13
PIN 14
PIN 15
PIN 16
PIN 17
PIN 18
PIN 19
PIN 20
Part No.
■
NAME
GND
TX_FAULT
TX_DISABLE
MOD_DEF(2)
MOD_DEF(1)
MOD_DEF(0)
Rate select
LOS
GND
GND
GND
RD-
RD+
GND
VCC
VCC
GND
TD+
TD-
GND
Ground
This pin is internally tied to transmit ground. TX_Fault is not implemented.
Low for normal operation. Active high input which disables the transmitter output. 5.1K pull-up on module.
Signal SDA (Data) of the two-wire serial ID interface.
Signal SCL (Clock) of the two-wire serial ID interface.
This pin is internally tied to transmit ground.
This pin is floating. Rate select is not implemented.
See part description for details (below)
Ground
Ground
Ground
Differential receiver outputs. User to terminate to 100 ohms differential at host. (AC coupled)
Differential receiver outputs. User to terminate to 100 ohms differential at host. (AC coupled)
Ground
3.3V Power
3.3V Power
Ground
Differential transmitter inputs. Internally terminated to 100 ohms differential at host. (AC coupled)
Differential transmitter inputs. Internally terminated to 100 ohms differential at host. (AC coupled)
Ground
Options
Part No.
■
Options
■
■
74741-0001
■
■
Auto Negotiation On
Auto Negotiation Bypass
LOS Toggle
74741-0002
Auto Negotiation On
Auto Negotiation Bypass
LOS GND
SFP 1000BASE-T DIMENSIONS
Americas Headquarters
Lisle, Illinois 60532 U.S.A.
1-800-78MOLEX
amerinfo@molex.com
Far East North Headquarters
Yamato, Kanagawa, Japan
81-462-65-2324
feninfo@molex.com
Far East South Headquarters
Jurong, Singapore
65-6-268-6868
fesinfo@molex.com
European Headquarters
Munich, Germany
49-89-413092-0
eurinfo@molex.com
Corporate Headquarters
2222 Wellington Ct.
Lisle, IL 60532 U.S.A.
630-969-4550
Fax:630-969-1352
Visit our Web site at www.mo le x.com/pro du ct/ io / sfp1000.html
Order No. USA-209
Printed in USA/JI/2004.03
©
2004, Molex
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