HFCT-5911ATLZ Avago Technologies US Inc., HFCT-5911ATLZ Datasheet - Page 9

• Manufacturer Part Number: HFCT-5911ATLZ
• Description: TXRX SMF LC 1.25GBD 2X5 EXT TEMP
• Manufacturer: Avago Technologies US Inc.

Specifications of HFCT-5911ATLZ

• Data Rate: 1.25Gbps
• Wavelength: 1310nm
• Applications: Ethernet
• Voltage - Supply: 3.1 V ~ 3.5 V
• Connector Type: LC Duplex
• Mounting Type: Through Hole
• Supply Voltage: 3.3V
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Eye Safety Circuit
For an optical transmitter device to be eye-safe in the event
of a single fault failure, the transmit-ter must either maintain
eye-safe operation or be disabled.
The HFCT-5911ATLZ is intrinsically eye safe and does not
require shut down circuitry.
Signal Detect
The Signal Detect circuit provides a de-asserted output
signal when the optical link is broken (or when the remote
transmitter is OFF). The Signal Detect threshold is set to
transition from a high to low state between the minimum
receiver input optical power and -30 dBm avg. input opti-
cal power indicating a definite optical fault (e.g. unplugged
connector for the receiver or transmitter, broken fiber, or
failed far-end transmitter or data source). The Signal Detect
does not detect receiver data error or error-rate. Data er-
rors can be determined by signal processing offered by
upstream PHY ICs.
Figure 8. Recommended Panel Mounting
Package footprint and front panel considerations
The Avago Technologies transceivers comply with the
circuit board “Common Transceiver Footprint” hole
pattern defined in the current multisource agreement
which defined the 2 x 5 package style. This drawing
is reproduced in Figure  with the addition of ANSI
Y1.5M compliant dimensioning to be used as a guide
in the mechanical layout of your circuit board. Figure 8
shows the front panel dimensions associated with such
a layout.
9
(0.4 ± 0.004)
10.16 ± 0.1
DIMENSIONS IN MILLIMETERS (INCHES)
1.
2.
FIGURE DESCRIBES THE RECOMMENDED FRONT PANEL OPENING FOR A LC OR SG SFF TRANSCEIVER.
SFF TRANSCEIVER PLACED AT 15.24 mm (0.6) MIN. SPACING.
(0.56 ±0.004)
14.22 ±0.1
15.24
DETAIL A
(0.6)
TOP OF PCB
15.24
(0.6)
B
(0.039)
(0.62 MAX. 0.59 MIN.)
15.75 MAX. 15.0 MIN.
1
A
SECTION B - B
SOLDER POSTS
Electromagnetic Interference (EMI)
One of a circuit board designer’s foremost concerns is
the control of electromagnetic emissions from electronic
equipment. Success in controlling generated Electro-
magnetic Interference (EMI) enables the designer to pass
a governmental agency’s EMI regulatory standard and
more importantly, it reduces the possibility of interference
to neighboring equipment. Avago Technologies has
designed the HFCT-5911ATLZ to provide good EMI perfor-
mance. The EMI performance of a chassis is dependent on
physical design and features which help improve EMI sup-
pression. Avago Technologies encourages using standard
RF suppression practices and avoiding poorly EMI-sealed
enclosures.
Avago Technologies’ LC transceivers (HFCT-5911ATLZ)
have nose shields which provide a convenient chassis con-
nection to the nose of the transceiver. This nose shield
improves system EMI performance by effectively closing off
the LC aperture. Localized shielding is also improved by ty-
ing the four metal housing package grounding tabs to sig-
nal ground on the PCB. Though not obvious by inspection,
the nose shield and metal housing are electrically separated
for customers who do not wish to directly tie chassis and
signal grounds together. Figure 8 shows the recommended
positioning of the transceivers with respect to the PCB and
faceplate.
B