RoHS Compliant Single Mode SFP Transceiver for GbE and Fiber
Channel
FEATURES
Compliant with SFP Transceiver SFF-8472
MSA specification with internal calibration
Compliant with Specifications for IEEE
802.3z/Gigabit Ethernet
LCP-125B4Qxx compliant with the 1.0625GBd
Fiber Channel 100-SM-LC-L FC-PI Rev.13
Single + 3.3V Power Supply and TTL Logic
Interface
EEPROM with Serial ID Functionality
Laser Class 1 Product which comply with the
requirements of IEC 60825-1 and IEC 60825-2
Duplex LC Connector interface
Description
The LCP-1250 series are hot pluggable 3.3V
Small-Form-Factor transceiver modules designed
expressly
for
high-speed
communication
applications that require rates up to 1.25Gb/s.
The transceiver is data rate transparent, which
means it can support GbE (1.25Gb/s) as well as
1x Fiber channel (1.062Gb/s) operations
The LCP-1250 series are designed to be
compliant with SFP Multi-source Agreement
(MSA). Digital diagnostic monitoring functions
(Temperature, V
CC
, TX optical power, TX laser
bias current, and RX received optical power)
compliant with SFF-8472 are also available. See
order information for details.
The post-amplifier of the LCP-1250 series
also includes a Loss of Signal (LOS) circuit that
provides a TTL logic-high output when the
received optical level is below a preset LOS
Assert threshold.
Applications
Gigabit Ethernet
Switch to Switch interface
Switched backplane applications
File server interface
Performance
LCP-1250B4Qxx: 1310nm FP laser, 9.5dB link
budget (10km)
1
DELTA ELECTRONICS, INC.
Aug., 2006
Rev. 6E
www.deltaww.com
Absolute Maximum Ratings
Parameter
Storage Temperature
Supply Voltage
Symbol
Ts
V
CC
Min.
-40
0
Typ.
Max.
85
5
Unit
ºC
V
Note
Recommended Operating Conditions
Parameter
Case Operating Temperature
Supply Voltage
Note 1: See order information
Symbol
T
C
V
CC
Min.
-5
3.135
Typ.
Max.
70
3.465
Unit
ºC
V
Note
1
Electrical Characteristics
(V
CC
=3.3V
±
5%)
Parameter
Total Supply Current
Transmitter
Transmitter Differential Input Voltage
Transmitter Disable Input-High
Transmitter Disable Input-Low
Transmitter Fault Pull up Resistor
Transmitter Fault Output-High
Transmitter Fault Output-Low
Receiver
Receiver Differential Output Voltage
Receiver LOS Load
LOS Output Voltage-High
LOS Output Voltage-Low
Output Data Rise/Fall Time
Symbol
I
CCT
V
DT
V
DISH
V
DISL
R
TX_FAULT
V
TXFH
V
TXFL
V
DR
R
RXLOS
V
LOSH
V
LOSL
t
r
/ t
f
Min.
Typ.
Max.
300
2.4
V
CC
+0.3
0.8
10
V
CC
+0.3
0.8
2
10
V
CC
+0.3
0.8
220
Unit
mA
V
V
V
kΩ
V
V
V
kΩ
V
V
psec
Note
0.5
2
0
4.7
2
0
0.35
4.7
2
0
1
2
2
2
3
2
2
2
4
Notes:
1. Internally AC coupled and terminated to 100Ohm differential load.
2. Pull up to V
CC
on host Board
3. Internally AC coupled, but requires a 100Ohm differential termination at or internal to Serializer/
Deserializer.
4. These are 20%~80% values
2
DELTA ELECTRONICS, INC.
Aug., 2006
Rev. 6E
www.deltaww.com
Optical Characteristics
(V
CC
=3.3V
±
5%, Data Rate=1250Mb/sec, PRBS=2
7
-1 NRZ)
Parameter
Symbol
Min.
Transmitter
Output Optical Power (Avg.)
P
O
-9.5
Optical Extinction Ratio
9
λ
C
Center Wavelength
1274
σ
Spectral Width (RMS)
Optical Rise/ Fall Time
t
r
/t
f
Receiver
Sensitivity (Avg.)
P
IN
λ
Input Optical Wavelength
1270
LOS-Deasserted (Avg.)
P
A
LOS-Asserted (Avg.)
P
D
-36
LOS-Hysteresis
P
A
-P
D
0.5
Overload
P
O
-3
Notes:
1. These are unfiltered 20%~80% values
2
7
-1 PRBS and ER=9dB.
Typ.
Max.
-3
Unit
dBm
dB
nm
nm
psec
dBm
nm
dBm
dBm
dB
dBm
Note
1310
1355
4
260
-19
1570
-19
1
2
2. The sensitivity is provided at a BER of 1×10
-12
or better with an input signal consisting of 1250Mb/s,
Mask of the eye diagram for the optical transmit signal
3
DELTA ELECTRONICS, INC.
Aug., 2006
Rev. 6E
www.deltaww.com
SFP Transceiver Electrical Pad Layout
Pin Function Definitions
Pin Num.
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
Transmitter Ground
Transmitter Fault Indication
Transmitter Disable
Module Definition 2
Module Definition 1
Module Definition 0
Not Connect
Loss of Signal
Receiver Ground
Receiver Ground
Receiver Ground
Inv. Received Data Out
Received Data Out
Receiver Ground
Receiver Power
Transmitter Power
Transmitter Ground
Transmit Data In
Inv. Transmit Data In
Transmitter Ground
Plug Seq.
1
3
3
3
3
3
3
3
1
1
1
3
3
1
2
2
1
3
3
1
Notes
Note 1
Note 2
Module disables on high or open
Note 3, 2 wire serial ID interface
Note 3, 2 wire serial ID interface
Note 3, Grounded in Module
Function not available
Note 4
Note 5
Note 5
Note 5
Note 6
Note 7
Note 5
3.3 ± 5%, Note 7
3.3 ± 5%, Note 7
Note 5
Note 8
Note 8
Note 5
Plug Seq.: Pin engagement sequence during hot plugging.
4
DELTA ELECTRONICS, INC.
Aug., 2006
Rev. 6E
www.deltaww.com
Notes:
1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor on
the host board. Pull up voltage between 2.0V and VccT, R+0.3V. When high, output indicates a laser
fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.
2) TX disable is an input that is used to shut down the transmitter optical output. It is pulled up within the
module with a 4.7 – 10 K
Ω
resistor. Its states are:
Low (0 – 0.8V):
Transmitter on
(>0.8, < 2.0V):
Undefined
High (2.0 – 3.465V): Transmitter Disabled
Open:
Transmitter Disabled
3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7K –
10KΩresistor on the host board. The pull-up voltage shall be VccT or VccR (see Section IV for further
details). Mod-Def 0 is grounded by the module to indicate that the module is present Mod-Def 1 is the
clock line of two wire serial interface for serial ID Mod-Def 2 is the data line of two wire serial interface
for serial ID
4) LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ
resistor. Pull up voltage between 2.0V and VccT, R+0.3V. 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 < 0.8V.
5) VeeR and VeeT may be internally connected within the SFP module.
6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which
should be terminated with 100Ω (differential) 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 3.3V ±5% at the
SFP connector pin. Maximum supply current is 300mA. Recommended host board power supply
filtering is shown below. Inductors with DC resistance of less than 1 ohm should be used in order to
maintain the required voltage at the SFP input pin with 3.3V supply voltage. When the recommended
supply-filtering network is used, hot plugging of the SFP transceiver module will result in an inrush
current of no more than 30mA greater than the steady state value. VccR and VccT may be internally
connected within the SFP transceiver module.
8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω
differential termination inside the module. 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), though it is recommended that values between 500 and 1200 mV differential (250 –
600 mV single-ended) be used for best EMI performance.
5
DELTA ELECTRONICS, INC.
Aug., 2006
Rev. 6E
www.deltaww.com
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