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Product Specification

1000BASE-T Copper SFP 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 (1.05 W typical)

• Compact RJ-45 connector assembly

• RoHS compliant and 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)

. They are compatible

with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std 802.3

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.

PRODUCT SELECTION

Part Number Link Indicator on RX_LOS Pin 1000BASE-X auto-negotiation

enabled by default

FCLF-8520-3 Yes No

FCLF-8521-3 No Yes

Summary of content (7 pages)

PAGE 1
Finisar Product Specification 1000BASE-T Copper SFP 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.
PAGE 2
F i n i s a r FCLF-8520/8521-3 1000BASE-T SFP Product Specification I. SFP to Host Connector Pin Out Pin Symbol Name/Description Note 1 VEET Transmitter ground (common with receiver ground) 1 2 TFAULT Transmitter Fault. Not supported 3 TDIS 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.
PAGE 3
F i n i s a r FCLF-8520/8521-3 1000BASE-T SFP Product Specification 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 Supply Current Symbol Is Min Typ 320 Max 375 Units mA Input Voltage Vcc 3.13 3.3 3.47 V Maximum Voltage Vmax 4 V Surge Current Isurge 30 mA Notes/Conditions 1.
PAGE 4
F i n i s a r FCLF-8520/8521-3 1000BASE-T SFP Product Specification IV. High-Speed Electrical Interface All high-speed signals are AC-coupled internally. High-Speed Electrical Interface, Transmission Line-SFP Parameter Line Frequency Tx Output Impedance Rx Input Impedance Symbol fL Min Typ 125 Max Units MHz Notes/Conditions 5-level encoding, per IEEE 802.
PAGE 5
FCLF-8520/8521-3 1000BASE-T SFP Product Specification V. F i n i s a r General Specifications General Parameter Data Rate Cable Length Symbol BR L Min 10 Typ Max Units Notes/Conditions 1,000 Mb/sec IEEE 802.3 compatible. See Notes 2 through 4 below 100 m Category 5 UTP. BER <10-12 Table 6. General specifications Notes: 1. Clock tolerance is +/- 50 ppm 2. By default, the FCLF-8520/8521-3 is a full duplex device in preferred master mode 3. Automatic crossover detection is enabled.
PAGE 6
F i n i s a r FCLF-8520/8521-3 1000BASE-T SFP Product Specification Serial Bus Timing Requirements Parameter I2C Clock Rate Symbol Min 0 Typ Max 100,000 Units Notes/Conditions Hz Table 8. Serial bus timing requirements VIII. Mechanical Specifications The host-side of the FCLF-8520/8521-3 conforms to the mechanical specifications outlined in the SFP MSA1. The front portion of the SFP (part extending beyond the face plate of the host) is larger to accommodate the RJ-45 connector.
PAGE 7
FCLF-8520/8521-3 1000BASE-T SFP Product Specification F i n i s a r IX. References 1. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000. Documentation is currently available at Finisar upon request. 2. IEEE Std 802.3, 2002 Edition. IEEE Standards Department, 2002. 4. “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM”, Atmel Corporation. www.Atmel.com 5. “Alaska Ultra 88E1111 Integrated 10/100/1000 Gigabit Ethernet Transceiver”, Marvell Corporation. www.marvell.