HFBR-5911LZ/ALZ
Small Form Factor Optical Transceiver
for Gigabit Ethernet (1.25 GBd) and iSCSI
Data Sheet
Description
The HFBR-5911LZ/ALZ optical transceiver from Avago
Technologies is designed for use in short-reach multi-
mode fiber 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.
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 fiber
275 m
50/125 µm fiber
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
Related Products
• AFBR-5710LZ: 850 nm Small Form Factor Pluggable
optical transceiver for short reach Gigabit Ethernet
(1000BASE-SX) links
• HDMP-1687: Quad SerDes IC for Gigabit Ethernet
with 10 bit parallel interface and TTL clock input
• HDMP-1685A: Quad SerDes IC for Gigabit Ethernet
with 5 bit parallel interface and DDR TTL clock input
• HDMP-1636A/46A: Single SerDes IC for Gigabit Eth-
ernet and Fiber Channel
• HDMP-1637A: Single SerDes IC with PECL RefClk
• HDMP-1638: Single SerDes IC with PECL RefClk and
Dual Serial I/O
• HDMP-2634: Single SerDes IC 2.5/1.25 Gigabit
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
fiber 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
specification 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 significantly 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 offers a more space-efficient package
without the additional cost and complexity imposed by
pluggable architecture.
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
CC
fluctuation, unbalanced code)
or faults within the transceiver.
Receiver Section
The receiver section includes the Receiver Optical Subassem-
bly (ROSA) and the amplification/quantization circuitry. The
ROSA, containing a PIN photodiode and custom transimped-
ance preamplifier, 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-amplification and quantization.
Module Diagrams
The major functional components of the HFBR-5911LZ/ALZ
are illustrated in Figure 2 page 9. The external configu-
ration of the transceiver is depicted in Figure 3 page 10
while the host board and front panel layouts defined by
the SFF MSA are shown in Figure 4, page 11.
Signal Detect
The post-amplification/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 definite optical fault has occurred (e.g., disconnected or
broken fiber connection to receiver, failed transmitter, etc.).
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 differential 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).
2
Electrical Interfaces
The HFBR-5911LZ/ALZ interfaces with the host circuit
board through the ten I/O pins identified 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 differential 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.
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 flame 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-
fication (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).
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. Certification level is dependent of the overall
configuration of the host equipment. The transceiver
performance is offered as a figure 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 first 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 floor
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.
3
Table 1 - Supported Links from IEEE 802.3
Fiber Type
62.5 µm MMF
62.5 µm MMF
50 µm MMF
50 µm MMF
Modal bandwidth @ 850 nm
(min. overfilled launch) (MHz - km)
160
200
400
500
Link length
Minimum
2
2
2
2
Maximum
220
275
500
550
Units
m
m
m
m
Table 2 - Absolute Maximum Ratings
The Absolute Maximum Ratings are those values beyond which damage to the device may occur if these limits are exceeded for
other than a short period of time. See Reliability Data Sheet for specific reliability performance.
Parameter
Storage Temperature
Operating Temperature - Case
Aqueous Wash Pressure
Relative Humidity - non condensing
Supply Voltage
Voltage to any pin
TTL Transmit Disable Current
Symbol
T
S
T
C
RH
V
CC
I
I
Minimum
-40
-10
5
-0.5
-0.5
-3.0
Typical
Maximum
+100
+85
110
95
3.63
3.63
3.0
Units
° C
° C
psi
%
V
V
mA
Reference
Table 3 - Recommended Operating Conditions
The Recommended Operating Conditions are those values outside of which device reliability and performance to data sheet are
not implied, and damage to the device may occur over an extended period of time. See Reliability Data Sheet for specific reliabil-
ity performance.
Parameter
Temperature - Case
HFBR-5911LZ
HFBR-5911ALZ
Supply Voltage
Input Data Differential Voltage
TTL Transmit Disable Input Voltage - Low
TTL Transmit Disable Input Voltage - High
TTL Transmit Disable Input Current
Symbol
T
C
T
C
V
CC
V
IL
V
IH
I
I
Minimum
0
-10
3.14
0.4
V
CC
-1.3
-1.0
Typical
Maximum
+70
+85
3.47
1.6
0.8
V
CC
400
Units
°C
°C
V
V
V
V
mA
Reference
11
Notes:
1. Operating the transceiver beyond +70 °C for extended periods can adversely affect device reliability.
4
Table 4 - Pin Description
Pin
MS
HL
1
2
3
4
5
MS
HL
6
7
8
9
10
Symbol
MS
HL
Vee
r
Vcc
r
SD
RD-
RD+
MS
HL
Vcc
t
Vee
t
T
Dis
TD+
TD-
Functional Description
Mounting Stud
Housing Lead
Receiver Signal Ground
Receiver Power Supply
Signal Detect
Receiver Data Out Bar
Receiver Data Out
Mounting Stud
Housing Lead
Transmitter Power Supply
Transmitter Signal Ground
Transmitter Disable
Transmitter Data In
Transmitter Data In Bar
Logic
n/a
n/a
n/a
n/a
TTL
PECL
PECL
n/a
n/a
n/a
n/a
TTL
PECL
PECL
Reference
4
5
6
7
7
4
5
8
9
9
Figure 1 - Pin out drawing
Table 5 - Transmitter Electrical Characteristics
HFBR-5911LZ (T
C
= 0ºC to +70ºC, V
CC
= 3.14 V to 3.47 V)
HFBR-5911ALZ (T
C
= -10 °C to +85 °C, V
CC
= 3.14 V to 3.47 V)
Parameter
Transmitter Supply Current
Power Dissipation
Data Input Differential Voltage
Power Supply Noise Rejection
Symbol
I
CC
Tx
P
DISS
V
IH
-V
IL
PSNR
Minimum
Typical
55
180
Maximum
75
260
1600
Units
mA
mW
mV
mV
P-P
Reference
400
100
10
Notes:
4. The mounting studs provide mechanical attachment to the circuit board and connection to the equipment chassis ground. The MS via holes
must not be tied to signal ground and may be tied to chassis ground.
5. The housing leads provide additional signal grounding. The HL via holes must be tied to signal ground.
6. Normal operation:
Logic “1” output
No-signal condition:
Logic “0” output
7. AC coupled differential output. LVPECL signal. Interfacing ICs may require internal biasing.
8. Transmitter Output Disabled:
(Vcc
t
-1.3 V)<V<Vcc
t
Transmitter Output Enabled: Vee
t
< V < (Vee
t
+0.8 V)
9. AC coupled differential input, no external termination required. 100 ohm internal termination provided.
10. Tested with a 100 mV
P-P
sinusoidal signal in the frequency range from 10 KHz to 2 MHz on the V
CC
supply with the recommended power sup-
ply filter (with C8) in place. Typically, a change in sensitivity of less than 1 dB is experienced.
5
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