HFCT-5750TL/TP/ATL/ATP
Single Mode OC-12/STM-4
Small Form Factor Pluggable Transceivers
Part of the Avago METRAK family
Data Sheet
Description
The HFCT-5750xxx Small Form Factor Pluggable LC
optical transceivers are high performance, cost effective
modules for serial data transmission at a signal rate of 622
Mbit/s. The transceivers are compliant with SONET/SDH
and the Small Form Factor Pluggable (SFP) Multi-Source
Agreement (MSA) specifications. They are designed for
intermediate reach at 622 Mbit/s.
The transceivers operate at a nominal wavelength of
1300 nm over single mode fiber. The transmitter section
incorporates a highly reliable Fabry Perot (FP) laser and
uses an MOVPE grown planar PIN photodetector for low
dark current and excellent responsivity on the receiver
section.
The product meets all of the regulatory compliance listed
in Table 3.
Features
Related Poducts
• HFCT-595xx LC SFF PTH transceivers
• HDMP-3001 Ethernet Over SONET/SDH Mapper
• Compliant with ITU-T G.957 STM-4 S4.1 (15 km)
• Compliant with Telcordia GR253 OC-12 IR-1 (15 km)
Optical Interface
• Multi-Source Agreement (MSA) compliant SFP pack-
age
• Hot-pluggable
•
Multirate operation from 155 Mbit/s to 622 Mbit/s
with full OC-3 and OC-12 SONET compliance
• Operating case temperature range:
-40 to +85 °C (ATL/ATP)
-10 to +85 °C (TL/TP)
• Optional extended de-latch for high density applica-
tions
- standard de-latch
- bail de-latch
• Manufactured in an ISO 9001 “compliant facility”
• Single +3.3 V power supply
• Class 1 CDRH/IEC 825 eye safety compliant
• LC Duplex fiber connector
Applications
OC-12 SFP transceivers are designed for ATM LAN and WAN
applications such as:
•
•
•
•
ATM switches and routers
SONET/SDH switch infrastructure
xDSL applications
Metro edge switching
Functional Description - Receiver Section
Design
The receiver section for the HFCT-5750xxx contains an
InGaAs/InP photo detector and a preamplifier mounted
in an optical subassembly. This optical subassembly
is coupled to a postamp/decision circuit on a circuit
board.
The postamplifier is ac coupled to the preamplifier. The
coupling capacitors are large enough to pass the SONET/
SDH test pattern at 622 Mb/s without significant distor-
tion or performance penalty. If a lower signal rate, or a
code which has significantly more low frequency content
is used, sensitivity, jitter and pulse distortion could be
degraded.
There is a filter function which limits the bandwidth
of the preamp output signal. The filter is designed to
bandlimit the preamp output noise and thus improve the
receiver sensitivity.
Functional Description - Transmitter Section
Design
A schematic diagram for the transceiver is shown in
Figure 1. The HFCT-5750xxx incorporates an FP laser as
its optical source. All parts have been designed to be
compliant with IEC 825 eye safety requirements under
any single fault condition and CDRH under normal
operating conditions. The optical output is controlled by
a custom IC that detects the laser output via the monitor
photodiode. This IC provides both dc and ac current
drive to the laser to ensure correct modulation, eye
diagram and extinction ratio over temperature, supply
voltage and operating life.
Tx Fault
The HFCT-5750xxx module features a transmit fault
control signal output which when high indicates a laser
transmit fault has occurred and when low indicates
normal laser operation. A transmitter fault condition can
be caused by deviations from the recommended module
operating conditions or by violation of eye safety condi-
tions. A fault is cleared by cycling the Tx Disable control
input.
Loss of Signal
The Loss of Signal (LOS) output indicates that the optical
input signal to the receiver does not meet the minimum
detectable level for compliant signals. When LOS is high
it indicates loss of signal. When LOS is low it indicates
normal operation. The Loss of Signal thresholds are set
to indicate a definite optical fault has occurred (eg., dis-
connected or broken fiber connection to receiver, failed
transmitter).
Tx Disable
The HFCT-5750xxx accepts a transmit disable control
signal input which shuts down the transmitter. A high
signal implements this function while a low signal allows
normal laser operation. In the event of a fault (eg., eye
safety circuit activated), cycling this control signal resets
the module. The Tx Disable control should be actuated
upon initialization of the module.
HFCT-5760xx BLOCK DIAGRAM
ELECTRICAL INTERFACE
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
FILTER
AMPLIFIER
OUTPUT
BUFFER
DATA OUT
DATA OUT
LOS
PHOTODIODE
LASER
BIAS
CONTROL
MODULATOR
&
SAFETY
CIRCUITRY
DATA IN
DATA IN
TX_DISABLE
TX_FAULT
FP
LASER
LASER
DRIVER
MOD-DEF (2)
EEPROM
MOD-DEF (1)
MOD-DEF (0)
Figure 1. Transceiver functional diagram
2
Module Description
The transceiver meets the Small Form Pluggable (SFP)
industry standard package utilizing an integral LC-Duplex
optical interface connector. The hot-pluggable capability
of the SFP package allows the module to be installed at
any time - with the host system operating and on-line.
This allows for system configuration changes or main-
tenance without system down time. The HFCT-5750xxx
uses a reliable 1300 nm FP laser source and requires a 3.3
V dc power supply for optimal design.
Installation
The HFCT-5750xxx can be installed in or removed from
any MultiSource Agreement (MSA) - compliant Small
Form Pluggable port regardless of whether the host
equipment is operating or not. The module is simply
inserted, electrical interface first, under finger pressure.
Controlled hot-plugging is ensured by design and by
3-stage pin sequencing at the electrical interface. The
module housing makes initial contact with the host
board EMI shield mitigating potential damage due to
Electro-Static Discharge (ESD). The 3-stage pin contact
sequencing involves (1) Ground, (2) Power, and then (3)
Signal pins, making contact with the host board surface
mount connector in that order.
Module Diagrams
Figure 1 illustrates the major functional components
of the HFCT-5750xxx. The connection diagram of the
module is shown in Figure 4. Figure 2 depicts the
external configuration of the module. Figure 3 depicts
the MSA recommended power supply filter.
1
½H
10
µF
0.1
µF
1
½H
3.3 V
3.3 V
V
CC
,T
0.1
µF
4.7 K to 10 K
Tx Dis
Tx_FAULT
50
Ω
50
Ω
Tx_DISABLE
Tx_FAULT
TD+
TD-
TX GND
0.01
µF
V
CC
,R
0.1µF
AMPLIFICATION
&
QUANTIZATION
0.01
µF
100
LASER DRIVER
& SAFETY
CIRCUITRY
4.7 K to 10 K
HFCT-5760xx
20
19
18
17
16
15
14
13
12
11
EEPROM
V
EE
T
TD-
TD+
V
EE
T
V
CC
T
V
CC
R
V
EE
R
RD+
RD-
V
EE
R
TOP OF BOARD
1
2
3
4
5
6
7
8
9
10
V
EE
T
Tx FAULT
TxDISABLE
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
RATE SELECT
LOS
V
EE
R
V
EE
R
SERDES
PROTOCOL
IC
100
4.7 K to 10 K
10
½F
50
Ω
50
Ω
0.1
½F
RD+
RD-
Rx_LOS
RX GND
MOD_DEF2
Rx_LOS
0.1
µF
I2C MASTER
4.7 K to
10 K
4.7 K to
10 K
MOD_DEF1
MOD_DEF0
4.7 K to
10 K
BOTTOM OF BOARD
(AS VIEWED THROUGH TOP OF BOARD)
3.3 V
Figure 4. Connection diagram of module printed
circuit board
Figure 2. Recommended application configuration
1 µH
0.1 µF
V
CC
T
V
CC
R
0.1 µF
10 µF
1 µH
0.1 µF
10 µF
3.3 V
SFP MODULE
HOST BOARD
Figure 3. MSA required power supply filter
NOTE: INDUCTORS MUST HAVE LESS THAN 1
Ω
SERIES RESISTANCE PER MSA.
3
Table 1. Pin-out Table
The pin arrangement and definition of this product meets SFP MSA. Table 1 lists the pin description.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
VeeT
TX Fault
TX Disable
MOD-DEF2
MOD-DEF1
MOD-DEF0
Rate Select
LOS
VeeR
VeeR
VeeR
RD-
RD+
VeeR
VccR
VccT
VeeT
TD+
TD-
VeeT
Function/Description
Transmitter Ground
Transmitter Fault Indication
Transmitter Disable - Module disables on high or open
Module Definition 2 - Two wire serial ID interface
Module Definition 1 - Two wire serial ID interface
Module Definition 0 - Grounded in module
Not Connected
Loss of Signal
Receiver Ground
Receiver Ground
Receiver Ground
Inverse Received Data Out
Received Data Out
Receiver Ground
Receiver Power - 3.3 V ±5%
Transmitter Power - 3.3 V ±5%
Transmitter Ground
Transmitter Data In
Inverse Transmitter Data In
Transmitter Ground
MSA Notes
Note 1
Note 2
Note 3
Note 3
Note 3
Note 4
Note 5
Note 5
Note 5
Note 6
Note 6
Note 5
Note 7
Note 7
Note 5
Note 8
Note 8
Note 5
Notes:
1. TX Fault is an open collector/drain output which should be pulled up externally with a 4.7K – 10 KW resistor on the host board to a supply <
Vcc+0.3 V. When high, this output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be
pulled to < 0.8 V.
2. TX disable input is used to shut down the laser output per the state table below with an external 4.7-10 KW pull-up resistor.
Low (0 – 0.8 V):
Transmitter on
Between (0.8 V and 2.0 V): Undefined
High (2.0 – 3.465 V):
Transmitter Disabled
Open:
Transmitter Disabled
3. Mod-Def0,1,2. These are the module definition pins. They should be pulled up with a 4.7-10 KW resistor on the host board to a supply less
than VccT +0.3 V or VccR+0.3 V.
Mod-Def 0 is grounded by the module to indicate that the module is present
Mod-Def 1 is clock line of two wire serial interface for optional serial ID
Mod-Def 2 is data line of two wire serial interface for optional serial ID
4. LOS (Loss of Signal) is an open collector/drain output which should be pulled up externally with a 4.7K – 10KW resistor on the host board to
a supply < VccT,R+0.3 V. When high, this output indicates the received optical power is below the worst case receiver sensitivity (as defined
by the standard in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.8 V. Please see later section for LOS
timing.
5. VeeR and VeeT may be internally connected within the SFP module
6. RD-/+: These are the differential receiver outputs. They are ac coupled 100
W
differential lines which should be terminated with 100
W
differ-
ential at the user SERDES. The ac coupling is done inside the module and is thus not required on the host board. The voltage swing on these
lines will be between 370 and 2000 mV differential (185 – 1000 mV single ended) when properly terminated.
7. VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.1 – 3.5 V at the SFP connector pin. The maximum supply
current is 300 mA.
8. TD-/+: These are the differential transmitter inputs. They are ac coupled differential lines with 100
W
differential termination inside the mod-
ule. The AC coupling is done inside the module and is thus not required on the host board. The inputs will accept differential swings of 500
– 2400 mV (250 – 1200 mV single ended).
4
Serial Identification (EEPROM)
The HFCT-5750xx is compliant with the SFP MSA, which defines the serial identification protocol. This protocol uses
the 2-wire serial CMOS E2PROM protocol of the ATMEL AT24C01A or similar. MSA compliant, example contents of the
HFCT-5750xx serial ID memory are defined in Table 2.
Table 2. EEPROM Serial ID Memory Contents
Addr
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Hex
03
04
07
00
00
20
00
00
00
00
00
03
06
00
0F
96
00
00
00
00
41
47
49
4C
45
4E
54
20
20
20
20
20
20
20
20
20
00
00
30
ASCII
Addr
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
Hex
ASCII
H
F
C
T
-
5
7
5
0
x
x
Addr
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
Hex
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
0
0
0
Note 3
ASCII
Addr
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
Hex
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
ASCII
20
20
20
20
20
20
20
20
20
00
00
00
Note 3
00
1A
00
00
A
G
I
L
E
N
T
60
61
62
63
64
65
66
67
39
D3
Notes:
1. Address 68-83 specify a unique identifier.
2. Address 84-91 specify the date code.
3. Addresses 63 and 95 are check sums. Address 63 is the check sum for bytes 0-62 and address 95 is the check sum for bytes 64-94.
5
京公网安备 11010802033920号
EEWORLD
