HFBR-5911ALZ Datasheet HFBR-5911LZ, HFBR-5911ALZ | P1-P3

Description

The HFBR-5911LZ/ALZ optical transceiver from Avago

Technologies is designed for use in short-reach multi-

mode ber optic (1000BASE-SX) links between Gigabit

Ethernet networking equipment. Interoperable with

all equipment meeting the Gigabit Ethernet industry

standard, it is compliant with the Small Form Factor Multi

Source Agreement and requires a 3.3 V dc power supply.

The electrical interface follows the 2 x 5 format while the

optical interface uses the LC-Duplex connector.

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HFBR-5911LZ/ALZ

Small Form Factor Optical Transceiver

for Gigabit Ethernet (1.25 GBd) and iSCSI

Data Sheet

Features

• IEEE802.3GigabitEthernet

(1.25 Gbd) 1000BASE-SX compliant

• Industrystandardsmallformfactor(SFF)package

• LC-duplexconnectoropticalinterface

• 850nmVerticalcavitysurfaceemittinglaser

• InternallyterminatedandaccoupleddataIO

• Extendedoperatingtemperaturerange(HFBR-

5911ALZonly):

 -10to+85°C

• SignaldetectTTL

• Maximumlinklengths:

62.5/125µmber 275m

50/125µmber 550m

• LaserAELClass1(eyesafe)per:

 •US21CFR(J)

 •EN60825-1(+All)

• +3.3Vdcpowersupply

• ManufacturedinISO9001facilities

• RoHSCompliant

Applications

• Short-reachGigabitEthernetlinks

• Highspeedbackplaneinterconnects

• Switchedbackbones

• iSCSIapplications

Overview

Avago Technologies’ HFBR-5911LZ/ALZ optical transceiver

supports high-speed serial links over multimode optical

ber at signaling rates of up to 1.25 Gb/s. Compliant

with the Small Form Factor (SFF) Multi Source Agreement

(MSA)for2x5pinLCDuplextransceiversandIEEE802.3

specication for Gigabit Ethernet (GbE) links (1000BASE-

SX), the part is interoperable and interchangeable with

other conformant devices. Supported Gigabit Ethernet

link lengths are described in Table 1, but the transceiver

can also be used for other high-speed serial applications,

such as iSCSI.

The SFF package of the HFBR-5911LZ/ALZ allows design-

ers of Gigabit Ethernet networking equipment to maxi-

mize their use of available board space. The footprint

of the HFBR-5911LZ/ALZ is signicantly smaller than

those of other GbE transceivers formats - 25% smaller

thanSFPcageassemblies,30%smallerthantraditional

1 x 9 transceivers and 70% smaller than GBIC rail as-

semblies. The HFBR-5911LZ/ALZ trace keep-out area is

lessthan10%aslargeasthatrequiredbySFPtransceiv-

ers. For applications not requiring hot-pluggability, the

HFBR-5911LZ/ALZ oers a more space-ecient package

without the additional cost and complexity imposed by

pluggable architecture.

Module Diagrams

The major functional components of the HFBR-5911LZ/ALZ

are illustrated in Figure 2 page 9. The external congu-

ration of the transceiver is depicted in Figure 3 page 10

while the host board and front panel layouts dened by

theSFFMSAareshowninFigure4,page11.

Transmitter Section

The transmitter section consists of the Transmitter Optical

Subassembly (TOSA) and laser driver circuitry. The TOSA,

containingan850nmVCSEL(VerticalCavitySurfaceEmit-

ting Laser) light source, is located at the optical interface and

mates with the LC optical connector. The TOSA is driven by

acustomICwhichusestheincomingdierentialPECLlogic

signals to modulate the laser diode drive current. This Tx laser

driver circuit regulates the optical output power at a constant

level provided that the incoming data pattern is dc balanced

(8B10Bcodeforexample).

Tx_Disable

The HFBR-5911LZ/ALZ accepts a TTL transmit disable

control signal input which shuts down the transmitter. A

high signal implements this function while a low signal

allows normal transceiver operation. In the event of a

fault (e.g., eye safety circuit activated), cycling this control

signal resets the module as depicted in Figure 5 page 12.

A pull-down resistor enables the laser if the line is not

connected on the host board.

Host systems should allow a 10 ms interval between suc-

cessive assertions of this control signal.

Eye Safety Circuit

The HFBR-5911LZ/ALZ provides Class 1 eye safety by

design and has been tested for compliance with the

requirements listed in Table 11. The eye safety circuit

continuously monitors optical output power levels and

will disable the transmitter upon detecting an unsafe

condition. Such unsafe conditions can be due to inputs

from the host board (V

uctuation, unbalanced code)

or faults within the transceiver.

Receiver Section

The receiver section includes the Receiver Optical Subassem-

bly (ROSA) and the amplication/quantization circuitry. The

ROSA,containingaPINphotodiodeandcustomtransimped-

ance preamplier, is located at the optical interface and mates

with the LC optical connector. The ROSA output is fed to a

custom IC that provides post-amplication and quantization.

Signal Detect

The post-amplication/quantizer IC also includes transition

detection circuitry that monitors the ac level of the incoming

optical signal and provides a TTL status signal to the host. An

adequate optical input results in a high output while a low

Signal Detect output indicates an unusable optical input. The

Signal Detect thresholds are set so that a low output indicates

a denite optical fault has occurred (e.g., disconnected or

broken ber connection to receiver, failed transmitter, etc.).

Electrical Interfaces

The HFBR-5911LZ/ALZ interfaces with the host circuit

board through the ten I/O pins identied by function in

Table4.Thesepinsaresizedforuseinboardsbetween

0.062in. and 0.100 in. thick. The board layoutforthis

interfaceisdepictedinFigure4.

The HFBR-5911LZ/ALZ transmit and receive interfaces

requirePECLdierentialsignallinesonthehostboard.To

simplify board requirements, transmitter bias resistors and

ac coupling capacitors are incorporated into the transceiver

module and so are not required on the host board.

The Tx_Disable and Signal Detect lines require TTL lines on

the host board if they are to be utilized. The transceiver will

operate normally if these lines are not connected on the host

board.

Figure 2 depicts a recommended interface circuit to link the

HFBR-5911LZ/ALZ to the supporting physical layer ICs.

Timing for the MSA compliant control signals implement-

ed in this transceiver are listed in Table 9 and diagramed

in Figure 5.

PCB Assembly Process Compatibility

The HFBR-5911LZ/ALZ is compatible with industry-

standard wave solder and aqueous wash processes as

detailed in Table 10. The transceiver is shipped with a

process plug to keep out impinging liquids, but is not

intended to be immersed. After assembly, the process

plug should be kept in place as a dust plug when the

transceiver is not in use.

Regulatory Compliance

The HFBR-5911LZ/ALZ complies with all ap-

plicable laws and regulations as detailed in

Table 11. Certication level is dependent of the overall

conguration of the host equipment. The transceiver

performance is oered as a gure of merit to assist the

designer.

Electrostatic Discharge (ESD)

The HFBR-5911LZ/ALZ is compatible with ESD levels found

in typical manufacturing and operating environments as de-

scribed in Table 11. In the normal handling and operation of

optical transceivers, ESD is of concern in two circumstances.

The rst case is during handling of the transceiver prior to

soldering onto the host board. To protect the device, it’s

important to use normal ESD handling precautions. These

include using grounded wrist straps, workbenches and oor

mats wherever the transceiver is handled.

The second case to consider is static discharges to the exterior

of the host equipment chassis after assembly. If the optical

interface is exposed to the exterior of the host equipment

cabinet, the transceiver may be subject to system-level ESD

requirements.

EMI Immunity

Due to its shielded design, the EMI immunity of the HFBR-

5911LZ/ALZ exceeds typical industry standards.

Electromagnetic Interference (EMI)

Equipment incorporating Gigabit transceivers is typically sub-

jecttoregulationbytheFCCintheUnitedStates,TUVinthe

EuropeanUnionandVCCIinJapan.TheHFBR-5911LZ/ALZ’s

compliance to these standards is detailed in Table 11.

The metal housing and shielded design of the HFBR-

5911LZ/ALZ minimize the EMI challenge facing the

equipment designer.

Flammability

The HFBR-5911LZ/ALZ optical transceiver is made of metal

and high strength, heat resistant, chemical resistant and

UL94V-0ameretardantplastic.

Caution

There are no user serviceable parts nor any maintenance

required for the HFBR-5911LZ/ALZ. All adjustments are

made at the factory before shipment. Tampering with,

modifying, misusing or improperly handling the HFBR-

5911LZ/ALZ will void the product warranty. It may also

result in improper operation and possibly overstress the

lasersource.Performancedegradationordevicefailure

may result. Connection of the HFBR-5911LZ/ALZ to a

light source not compliant to the Gigabit Ethernet speci-

cation(IEEE802.3),operatingabovetherecommended

absolute maximum operating conditions or in a manner

inconsistent with it’s design and function may result in

exposure to hazardous radiation and may constitute

an act of modifying or manufacturing a laser product.

Person’sperformingsuchanactarerequiredbylawto

recertify and re-identify the laser product under the pro-

visionsofU.S.21CFR(SubchapterJ).

P1-P3 P4-P6 P7-P9 P10-P12

HFBR-5911ALZ

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HFBR-5911ALZ

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