25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 1
25Gbps 100m Duplex LC SFP28 Transceiver
PSP28-8501M
Features
Supports 24.3Gbps to 28.1Gbps bit rates
850nm VCSEL Laser and PIN photo-detector
Up to 70m on 50/125µm MMF(OM3)
Up to 100m on 50/125µm MMF(OM4)
Duplex LC receptacle optical interface compliant
Hot pluggable
All-metal housing for superior EMI performance
RoHS6 compliant (lead free)
Operating case temperature:
Commercial: -5ºC to +70°C
Applications
25G SR
100G SR4 fan out to 4x25GE SR
eCPRI
Standards
Compliant with INF-8431
Compliant with SFF-8472
Compatible with IEEE802.3by
Description
The SFP28 transceivers are designed for use in 25-Gigabit data rate over multimode fiber.
The transceivers are compatible with INF-8431 and SFF-8472. For further information, please refer to INF-8431
and SFF-8472.
25Gbps 100m Duplex LC
PSP28-8501M
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
Relative Humidity
RH
0
85
%
RX Input Average Power
Pmax
-
3
dBm
Recommended Operating Environment
Parameter
Symbol
Min.
Typical
Max.
Power Supply Voltage
VCC
3.13
3.3
3.46
Power Supply Current
ICC
290
Operating Case Temperature
TC
-5
+70
Data Rate
25.78
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 3
Electrical Characteristics
Parameter
Symbol
Min.
Typical
Max.
Unit
Note
Transmitter Section
Input Differential Impedance
Rin
90
100
110
Ω
Differential Data Input Swing
Vin PP
200
900
mV
1
Transmit Disable Voltage
VD
Vcc – 1.3
Vcc
V
Transmit Enable Voltage
VEN
Vee
Vee+ 0.8
V
Receiver Section
Differential Data Output Swing
Vout PP
400
900
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
840
-
860
nm
Spectral Width (RMS)
σ
0.6
nm
Average Optical Power (avg.)
Pout
-6.7
+2.4
dBm
1
Laser Off Power
Poff
-
-
-30
dBm
Extinction Ratio
ER
2
-
-
dB
2
Relative Intensity Noise
RIN
-
-
-130
dB/Hz
Optical Return Loss Tolerance
-
-
12
dB
Vertical Eye Closure Penalty
CEVPQ
3.13
dB
Output Optical Eye
Compliant with IEEE802.3by eye masks when filtered
2
Receiver Section
Receiver Center Wavelength
λc
840
-
860
nm
Receiver Sensitivity (OMA)
Sen
-10
2
dBm
3
Los Assert
LOSA
-26
-
-
dBm
Los Dessert
LOSD
-
-
-13
dBm
Los Hysteresis
LOSH
0.5
-
5
dB
Overload
Pin-max
-
-
2
dBm
3
Receiver Reflectance
-
-
-12
dB
Receiver Power (damage)
-
-
3
dBm
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 4
Notes:
1. The optical power is launched into 50/125µm MMF.
2. Measured with a PRBS 231-1 test pattern @25.78Gbps.
3. Measured with a PRBS 231-1 test pattern @25.78bps, ER=4.8dB, BER <10-5.
Timing Characteristics
Parameter
Symbol
Min.
Typical
Max.
Unit
TX_Disable Assert Time
t_off
100
us
TX_Disable Negate Time
t_on
2
ms
Time to Initialize
t_start_up
300
ms
Tx_Fault Assert
t_fault_on
1
ms
Tx_Fault Reset
t_reset
10
us
Rx_LOS Assert Delay
t_los_on
100
us
Rx_LOS Negate Delay
t_los_off
100
us
Clock Frequency
fSCL
0
400
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).
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 5
Pin Definitions
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 6
Pin Descriptions
Pin
Signal Name
Description
Plug Seq.
Notes
1
VeeT
Module Transmitter Ground
1
1
2
TX FAULT
Module Transmitter Fault
3
3
TX Disable
Transmitter Disable; Turns off transmitter
laser output
3
4
SDA
2-Wire Serial Interface Data Line
3
2
5
SCL
2-Wire Serial Interface Clock
3
2
6
Mod_ABS
Module Definition, Grounded in the
module
3
7
RS0
Receiver Rate Select (not used)
3
8
LOS
Receiver Loss of Signal Indication Active
LOW
3
9
RS1
Transmitter Rate Select (not used)
3
10
VeeR
Module Receiver Ground
1
1
11
VeeR
Module Receiver Ground
1
1
12
RD-
Receiver Inverted Data Output
3
13
RD+
Receiver Non-Inverted Data Output
3
14
VeeR
Module Receiver Ground
1
1
15
VccR
Module Receiver 3.3 V Supply
2
16
VccT
Module Transmitter 3.3 V Supply
2
17
VeeT
Module Transmitter Ground
1
1
18
TD+
Transmitter Non-Inverted Data Input
3
19
TD-
Transmitter Inverted Data Input
3
20
VeeT
Module Transmitter Ground
1
1
Notes:
Plug Seq.: Pin engagement sequence during hot plugging.
1. Module ground pins GND are isolated from the module case.
2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.45V on the host board.
Recommended Power Interface Circuit
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 7
Recommended Interface Circuit
Mechanical Dimensions
25Gbps 100m Duplex LC
PSP28-8501M
Primus IT Limited
Page 8
Ordering information
Part Number
Product Description
PSP28-8501M
850nm, 25Gbps, 100m (MMF OM4), Duplex LC SFP28 Transceiver, -5ºC ~ +70ºC, With
DDM.
References
1. “Specifications for Enhanced Small Form Factor Pluggable Module SFP+”, SFF-8431, Rev 4.1, July 6, 2009.
2. “Improved Pluggable Form factor”, SFF-8432, Rev 4.2, Apr 18, 2007.
3. “Diagnostic Monitoring Interface for Optical Transceivers” SFF-8472, Rev 10.2, June 1, 2007.
4. IEEE802.3by.
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