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FCLF-8521-3

P1-P3P4-P6P7-P7
Finisar Corporation – August 2015 Rev. E1 Page 1
Product Specification
1000BASE-T COPPER SFP Optical Transceiver
FCLF-8520/8521-3
PRODUCT FEATURES
Up to 1.25Gb/s bi-directional data links
Hot-pluggable SFP footprint
Extended case temperature range -0°C to
+85°C
Fully metallic enclosure for low EMI
Low power dissipation (1.05W typical)
Compact RJ-45 connector assembly
RoHS-6 compliant (lead-free)
Access to physical layer IC via 2-wire serial
bus
10/100/1000 BASE-T operation in host
systems with SGMII interface
APPLICATIONS
1.25 Gigabit Ethernet
over Cat 5 cable
Finisar’s FCLF-8520/8521-3 1000BASE-T Copper Small Form Pluggable (SFP) transceivers
are based on the SFP Multi Source Agreement (MSA)
1
. They are compatible with the Gigabit
Ethernet and 1000BASE-T standards as specified in IEEE Std 802.3
2
. The 1000BASE-T
physical layer IC (PHY) can be accessed via I2C, allowing access to all PHY settings and
features.
The FCLF-8520-3 uses the SFP’s RX_LOS pin for link indication, and 1000BASE-X auto-
negotiation should be disabled on the host system. The FCLF-8521-3 is compatible with
1000BASE-X auto-negotiation, but does not have a link indication feature (RX_LOS is
internally grounded). See AN-2036 (“Frequently Asked Questions Regarding Finisar’s
1000BASE-T SFPs”) for a more complete explanation on the differences between the two
models and details on applications issues for the products.
The optical transceiver is compliant per the RoHS Directive 2011/65/EU. See Finisar
Application Note AN-2038 for more details
5,6
.
PRODUCT SELECTION
Part Number Lin
k
Indicator on RX
_
LOS Pin
1000BASE-X auto-negotiation
enabled by default
FCLF-8520-3 Yes No
FCLF-8521-3 No Yes
FCLF-8520/8521-3 Product Specification
Finisar Corporation – August 2015 Rev. E1 Page 2
I. SFP to Host Connector Pin Out
Pin S
y
mbol Name/Description Note
1 V
EET
Transmitter ground (common with receiver ground) 1
2 T
FAULT
Transmitter Fault. Not supported
3 T
DIS
Transmitter Disable. PHY disabled on high or open 2
4 MOD_DEF(2) Module Definition 2. Data line for serial ID 3
5 MOD_DEF(1) Module Definition 1. Clock line for serial ID 3
6 MOD_DEF(0) Module Definition 0. Grounded within the module 3
7 Rate Select No connection required
8 LOS Loss of Signal indication. 4
9 V
EER
Receiver ground (common with transmitter ground) 1
10 V
EER
Receiver ground (common with transmitter ground) 1
11 V
EER
Receiver ground (common with transmitter ground) 1
12 RD- Receiver Inverted DATA out. AC coupled
13 RD+ Receiver Non-inverted DATA out. AC coupled
14 V
EER
Receiver ground (common with transmitter ground) 1
15 V
CCR
Receiver power supply
16 V
CCT
Transmitter power supply
17 V
EET
Transmitter ground (common with receiver ground) 1
18 TD+ Transmitter Non-Inverted DATA in. AC coupled
19 TD- Transmitter Inverted DATA in. AC coupled
20 V
EET
Transmitter ground (common with receiver ground) 1
Notes: 1. Circuit ground is connected to chassis ground
2. PHY disabled on T
DIS
> 2.0V or open, enabled on T
DIS
< 0.8V
3. Should be pulled up with 4.7k – 10k Ohms on host board to a voltage between 2.0 V and 3.6 V.
MOD_DEF(0) pulls line low to indicate module is plugged in.
4. LVTTL compatible with a maximum voltage of 2.5V. Not supported on FCLF-8521-3.
Table 1. SFP to host connector pin assignments and descriptions
Towards
Bezel
1
VeeT
2
TXFault
3 TX
Disable
4
MOD-DEF(2)
5
MOD-DEF(1)
6
MOD-DEF(0)
7 Rate
Select
8
LOS
9
VeeR
10
VeeR
VeeT
TD-
TD+
VeeT
VccT
VccR
VeeR
RD+
RD-
VeeR
20
19
18
17
16
15
14
13
12
11
Towards
ASIC
Figure 1. Diagram of host board connector block pin numbers and names
FCLF-8520/8521-3 Product Specification
Finisar Corporation – August 2015 Rev. E1 Page 3
II. +3.3V Volt Electrical Power Interface
The FCLF-8520/8521-3 has an input voltage range of 3.3 V +/- 5%. The 4 V maximum
voltage is not allowed for continuous operation.
+3.3 Volt Electrical Power
Interface
Parameter S
y
mbol Min T
y
p Max Units Notes/Conditions
Supply Current
I
s
320 375 mA 1.2W max power over
full range of voltage
and temperature.
See caution note below
Input Voltage
V
cc
3.13 3.3 3.47 V Referenced to GND
Maximum Voltage
V
max

4 V
Surge Current
I
surge

30 mA Hot plug above steady state
current. See caution note
below
Caution: Power consumption and surge current are higher than the specified values in the SFP MSA
Table 2. +3.3 Volt electrical power interface
III. Low-Speed Signals
MOD_DEF(1) (SCL) and MOD_DEF(2) (SDA), are open drain CMOS signals (see
section VII, “Serial Communication Protocol”). Both MOD_DEF(1) and MOD_DEF(2)
must be pulled up to host_Vcc.
Low-Speed Signals,
Electronic Characteristics
Parameter S
y
mbol Min Max Units Notes/Conditions
SFP Output LOW
V
OL
0 0.5 V 4.7k to 10k pull-up to host_Vcc,
measured at host side of connector
SFP Output HIGH
V
OH
host_Vcc - 0.5 host_Vcc + 0.3 V 4.7k to 10k pull-up to host_Vcc,
measured at host side of connector
SFP Input LOW
V
IL
0 0.8 V 4.7k to 10k pull-up to Vcc,
measured at SFP side of connector
SFP Input HIGH V
IH
2 Vcc + 0.3 V
4.7k to 10k pull-up to Vcc,
measured at SFP side of connector
Table 3. Low-speed signals, electronic characteristics
P1-P3P4-P6P7-P7

FCLF-8521-3

Mfr. #:
Buy FCLF-8521-3
Manufacturer:
Finisar Corporation
Description:
Fiber Optic Transmitters, Receivers, Transceivers 3.3V, RJ-45 conn w/ serial ID, 100m
Lifecycle:
New from this manufacturer.
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