1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 1
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Features
Up to 1.25Gbps data links
850nm VCSEL Laser and PIN photo-detector
Up to 550m on 50/125µm MMF
Duplex LC receptacle optical interface compliant
Hot pluggable
All-metal housing for superior EMI performance
RoHS6 compliant (lead free)
Operating case temperature:
Commercial: -5°C to +70°C
Extended: -20°C to +80°C
Industrial: -40°C to +85°C
Applications
Gigabit Ethernet
Fiber Channel
Switch to Switch interface
Switched backplane applications
Router/Server interface
Other optical transmission systems
Standards
Compliant with SFP MSA
Compliant with SFF-8472
Compatible with IEEE802.3ah 2004
Description
The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 550m
transmission distance with MMF.
The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information,
please refer to SFP MSA and SFF-8472.
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 2
Module Block Diagram
Absolute Maximum Ratings
Parameter
Symbol
Min.
Typical
Max.
Unit
Power Supply Voltage
VCC
0
3.6
V
Storage Temperature
Ts
-40
+85
C
Operating Case Temperature
Tc
-40
+85
°C
Relative Humidity
RH
0
85
%
RX Input Average Power
Pmax
-
0
dBm
Recommended Operating Environment:
Parameter
Symbol
Min.
Typical
Max.
Power Supply Voltage
VCC
3.13
3.3
3.46
Power Supply Current
Icc
300
Operating Case Temperature
Commercial
TC
-5
+70
Extended
-20
+80
Industrial
-40
+85
Data Rate
1.25
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 3
Electrical Characteristics
Parameter
Symbol
Min.
Typical
Max.
Unit
Note
Transmitter Section
Input Differential Impedance
Rin
90
100
110
Ω
Single Ended Data Input Swing
Vin PP
250
1000
mV
1
Transmit Disable Voltage
VD
Vcc – 1.3
Vcc
V
Transmit Enable Voltage
VEN
Vee
Vee+ 0.8
V
Receiver Section
Single Ended Data Output Swing
Vout PP
300
600
mV
LOS Fault
Vlos fault
Vcc – 0.5
Vcc_host
V
2
LOS Normal
Vlos norm
Vee
Vee+0.5
V
2
Notes:
1. Connected directly to TX data input pins. AC coupling from pins into laser driver IC.
2. LOS is an open collector output. Should be pulled up with 4.7kΩ – 10kΩ on the host board. Normal
operation is logic 0; loss of signal is logic 1.
Optical Parameters
Parameter
Symbol
Min.
Typical
Max.
Unit
Note
Transmitter Section
Centre Wavelength
λc
830
850
860
nm
Spectral Width (RMS)
σ
0.85
nm
Average Optical Power (avg.)
Pout
-9
-3
dBm
1
Laser Off Power
Poff
-
-
-45
dBm
Extinction Ratio
ER
9
-
-
dB
2
Relative Intensity Noise
RIN
-
-
-128
dB/Hz
Optical Rise/Fall Time
tr/ tf
-
260
ps
3
Optical Return Loss Tolerance
-
-
12
dB
Output Optical Eye
Compliant with IEEE802.3z eye masks when filtered
2
Receiver Section
Receiver Center Wavelength
λc
830
860
nm
Receiver Sensitivity in Average
Power
Sen
-18
-3
dBm
4
Los Assert
LOSA
-35
-
-
dBm
Los Dessert
LOSD
-
-
-19
dBm
Los Hysteresis
LOSH
0.5
-
5
dB
Overload
Pin-max
-
-
-3
dBm
4
Receiver Reflectance
-
-
-12
dB
Receiver Power (damage)
-
-
0
dBm
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 4
Notes:
1. The optical power is launched into 50/125µm MMF.
2. Measured with a PRBS 27-1 test pattern @1.25Gbps.
3. Unfiltered, 20-80%. Measured with a PRBS 27-1 test pattern @1.25Gbps.
4. Measured with a PRBS 27-1 test pattern @1.25Gbps, ER=10dB, BER <10-12.
Timing Characteristics
Parameter
Symbol
Min.
Typical
Max.
Unit
TX_Disable Assert Time
t_off
10
us
TX_Disable Negate Time
t_on
1
ms
Time to Initialize Include Reset of TX_FAULT
t_init
300
ms
TX_FAULT from Fault to Assertion
t_fault
100
us
TX_Disable Time to Start Reset
t_reset
10
us
Receiver Loss of Signal Assert Time
TA, RX_LOS
100
us
Receiver Loss of Signal Deassert Time
Td, RX_LOS
100
us
Rate-Select Change Time
t_ratesel
10
us
Serial ID Clock Time
f_serial-clock
100
kHz
Digital Diagnostic Monitor Characteristics (DDM)
The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless
otherwise specified. It is compliant to SFF8472 Rev10.2 with internal calibration mode. For external calibration
mode please contact our sales stuff.
Parameter
Symbol
Min.
Max.
Unit
Temperature Monitor Absolute Error
DMI_Temp
-3
3
C
Laser Power Monitor Absolute Error
DMI_TX
-3
3
dB
RX Power Monitor Absolute Error
DMI_RX
-3
3
dB
Supply Voltage Monitor Absolute Error
DMI_VCC
-3%
3%
V
Bias Current Monitor Absolute Error
DMI_Ibias
-10%
10%
mA
Digital Diagnostic Memory Map (Compliant with SFF-8472)
The transceivers provide serial ID memory contents and diagnostic information about the present operating
conditions by the 2-wire serial interface (SCL, SDA).
The diagnostic information with internal calibration or external calibration all are implemented, including received
power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and
temperature monitoring.
The digital diagnostic memory map specific data field defines as following (For further information, please refer to
SFF-8472).
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 5
Pin Definitions
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 6
Pin Descriptions
Pin
Signal Name
Description
Plug Seq.
Notes
1
VeeT
Transmitter Ground
1
2
TX FAULT
Transmitter Fault Indication
3
1
3
TX Disable
Transmitter Disable
3
2
4
MOD_DEF(2)
CI 2
Serial Data Signal SDA
3
3
5
MOD_DEF(1)
CI 2
Serial Clock Signal SCL
3
3
6
MOD_DEF(0)
Grounded in Module
3
3
7
Rate Select
Not Connected
3
8
LOS
Receiver Loss of Signal Indicator (Active
high, open-drain)
3
4
9
VeeR
Receiver Ground
1
10
VeeR
Receiver Ground
1
11
VeeR
Receiver Ground
1
12
RD-
Inv. Received Data Out
3
5
13
RD+
Received Data Out
3
5
14
VeeR
Receiver Ground
1
15
VccR
Receiver Power Supply
2
16
VccT
Transmitter Power Supply
2
17
VeeT
Transmitter Ground
1
18
TD+
Transmit Data In
3
6
19
TD-
Inv. Transmit Data In
3
6
20
VeeT
Transmitter Ground
1
2
Notes:
Plug Seq.: Pin engagement sequence during hot plugging.
1. TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board
to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of
some kind. In the low state, the output will be pulled to less than 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 4.7k~10kΩ resistor. Its states are:
Low (0 to 0.8V): Transmitter on;
Between (>0.8V, < 2.0V): Undefined;
High (2.0 to 3.465V): Transmitter Disabled;
Open: Transmitter Disabled.
3. Mod-Def0, 1, 2: These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on
the host board. The pull-up voltage shall be VccT or VccR.
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 SCL.
MOD_DEF (2) is the data line of two wire serial interface for serial ID SDA.
4. LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage
between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low
state, the output will be pulled to less than 0.8V.
5. RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which
should be terminated with 100Ω (differential) at the user SERDES.
6. TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with
100Ω differential termination inside the module.
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 7
Recommended Interface Circuit
Mechanical Dimensions
1.25Gbps 550m Duplex LC SFP Transceiver
PSP12-8505M
Primus IT Limited
Page 8
Ordering information
Part Number
Product Description
PSP12-8505M
850nm, 1.25Gbps, 550m, Duplex LC SFP Transceiver, -5ºC ~ +70ºC, With DDM.
PSP12-8505ME
850nm, 1.25Gbps, 550m, Duplex LC SFP Transceiver, -20ºC ~ +80ºC, With DDM.
PSP12-8505MT
850nm, 1.25Gbps, 550m, Duplex LC SFP Transceiver, -40ºC ~ +85ºC, With DDM.
References
1. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000.
2. Telcordia GR-253-CORE Specifications.
3. “Diagnostic Monitoring Interface for Optical Transceivers” SFF-8472, Rev 10.2, June 1, 2007.
4. IEEE802.3ah 2004.
Important Notice
Performance figures, data and any illustrative material provided in this data sheet are typical and must be
specifically confirmed in writing by PRIMUS IT before they become applicable to any particular order or contract.
In accordance with the PRIMUS IT policy of continuous improvement specifications may change without notice.
The publication of information in this data sheet does not imply freedom from patent or other protective rights of
PRIMUS IT or others. Further details are available from any PRIMUS IT sales representative.
Contact Information
PRIMUS IT LIMITED
1、HongKong：RM M4/F Continental Mansion 300 King's RD HK
2、Tel:+86 0755-25924025
3、Fax:+86 0755-25924051
4、Website：http://www.primus-it.com
5、Email：sales@primus-it.com