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25Gb/s SFP28 CWDM 10km

Product Details

Features

Up to 25.78Gb/s data links

CWDM DFB laser and PIN receiver

Up to 10km on 9/125um SMF

Hot-pluggable SFP footprint

Digital diagnostic capabilities

Class 1 laser safety certified

Cost effective SFP28 solution, enables higher port densities and greater bandwidth 

RoHS compliant and lead-free

Single +3.3V power supply

2-wire interface for management specifications compliant with SFF-8472 digital diagnostic monitoring interface for optical transceivers

All-metal housing for superior EMI performance

Case operating temperature

       Commercial: 0 ~ +70℃

       Extended: -10 ~ +80℃

       Industrial: -40 ~ +85℃


Applications

High-speed storage area networks

Computer cluster cross-connect

Custom high-speed data pipes

Inter Rack Connection


Part Number Ordering Information


Part Number

Data Rate (Gb/s)


Wavelength (nm)

Transmission Distance(km)

Temperature () (Operating Case)

HCSC-FLxx11C

25.78

1270~1370

10km SMF

0~70 commercial

HCSC-FLxx11E

25.78

1270~1370

10km SMF

-10~80 Extended

HCSC-FLxx11I

25.78

1270~1370

10km SMF

-40~85 Industrial


HCSC-FLxx11x Wavelength List:


Wavelength

xx

Clasp Color Code


Wavelength

xx

Clasp Color Code

1270

6

Gray

1330

8

Purple

1290

7

Gray

1350

9

Blue

1310

3

Gray

1370

A

Green


Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module. 

Parameter

Symbol

Min

Max

Unit

Notes

Storage Temperature

TS

-40

85


Power Supply Voltage

VCC

-0.5

3.6

V


Relative Humidity (non-condensation)

RH

5

95

%


Damage Threshold

THd

3


dBm



Recommended Operating Conditions and Power Supply Requirements

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Operating Case Temperature

TOP

0


70

commercial

-40


85

Industrial

Power Supply Voltage

VCC

3.135

3.3

3.465

V


Data Rate



25.78


Gb/s


Control Input Voltage High


2


Vcc

V


Control Input Voltage Low


0


0.8

V


Link Distance (SMF)

D



10

km

9/125um


General Description

HC’HCSC-FLxx11x 25Gb/s SFP28 transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the CWDM DFB laser and the PIN photo-detector .The module data link up to 10km in 9/125um single mode fiber.

 

The module optical connection is duplex LC and shall be compatible with SFP+ 28Gbps and backward compatible with legacy 10G SFP+ pluggable. The SFP28 CWDM LR module is a dual directional device with a transmitter and receiver plus a control management interface (2-wire interface) in the same physical package. 2-wire interface is used for serial ID, digital diagnostics and module control function.

 

The transmitter converts 25Gbit/s serial PECL or CML electrical data into serial optical data compliant with the 25GBASE-LR standard.  An open collector compatible Transmit Disable (Tx_Dis) is provided.  Logic “1” or no connection on this pin will disable the laser from transmitting.  Logic “0” on this pin provides normal operation.  The transmitter has an internal automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature variations.  An open collector compatible Transmit Fault (Tx_Fault) is provided.  TX_Fault is module output contact that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety.  The TX_Fault output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host with a resistor in the range 4.7-10 kΩ.   TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP28 module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor

 

The receiver converts 25Gbit/s serial optical data into serial PECL/CML electrical data.  An open collector compatible Loss of Signal is provided.  Rx_LOS when high indicates an optical signal level below that specified in the relevant standard.  The Rx_LOS contact is an open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or with an active termination.  Power supply filtering is recommended for both the transmitter and receiver.   The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP28 is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.


Pin Assignment and Pin Description

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Figure1. Diagram of host board connector block pin numbers and names


PIN

Name

Name/Description

Notes

1

VeeT

Transmitter Ground

1

2

TX_Fault

Transmitter Fault


3

TX_Disable

Transmitter Disable; Turns off transmitter laser output


4

SDA

Two wire serial interface Data Line (LVCMOS-I/O) (MOD-DEF2)

2

5

SCL

Two wire serial interface Clock Line (LVCMOS-I/O) (MOD-DEF1)

2

6

MOD_ABS

Module Definition, Grounded in the module


7

RS0

Rx Rate Select:


8

RX_LOS

Receiver Loss of Signal Indication Active LOW


9

RS1

Transmitter Rate Select (not used)


10

VeeR

Receiver Ground

1

11

VeeR

Receiver Ground

1

12

RD-

Receiver Inverted Data Output


13

RD+

Receiver Data Output


14

VeeR

Receiver Ground

1

15

VccR

Receiver Power - +3.3V


16

VccT

Transmitter Power - +3.3 V


17

VeeT

Transmitter Ground

1

18

TD+

Transmitter Non-Inverted Data Input


19

TD-

Transmitter Inverted Data Input


20

VeeT

Transmitter Ground

1

Notes:

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 3.47V on the host board.


Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter

Symbol

Min.

Typ.

Max

Unit

Notes

Power Consumption

p



1.5

W


Supply Current

Icc



450

mA



Transmitter

Single-ended Input Voltage Tolerance

Vcc

-0.3


4.0

V


Common mode voltage tolerance


15



mV


Differential Input Voltage Swing

Vin,pp

180


700

mVpp


Differential Input Impedance

Zin

90

100

110

Ohm

1

Transmit Disable Assert Time




10

us


Transmit Disable Voltage

Vdis

Vcc-1.3


Vcc

V


Transmit Enable Voltage

Ven

Vee


Vee +0.8

V

2

Receiver

Single-ended Input Voltage Tolerance

Vcc

-0.3


4.0

V


Differential Output Voltage Swing

Vout,pp

300


900

mVpp


Differential Output Impedance

Zout

90

100

110

Ohm

3

Data output rise/fall time

Tr/Tf

9.5



ps

4

LOS Assert Voltage

VlosH

Vcc-1.3


Vcc

V

5

LOS De-assert Voltage

VlosL

Vee


Vee +0.8

V

5

Notes:

1. Connected directly to TX data input pins. AC coupled thereafter.   

2. Or open circuit.   

3. Input 100 ohms differential termination.   

4. These are unfiltered 20-80% values.  

5. Loss of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.   


Optical Characteristics

The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter

Symbol

Min.

Typical

Max

Unit

Notes

Transmitter

Center Wavelength

λC

λ -6.5


λ +6.5

nm


Optical Spectral Width

λ



1

nm


Average Optical Power

PAVG

-7


2

dBm

1

Side Mode Suppression Ratio

SMSR

30



dB


Optical Extinction Ratio

ER

3.5



dB


Transmitter OFF Output Power

Poff



-30

dBm


Transmitter and Dispersion Penalty

TDP



2.7

dB


Optical Return Loss Tolerance

ORLT



20

dB


Transmitter Eye Mask

Compliant with IEEE802.3ae


Receiver

Center Wavelength

λC

1270


1610

nm


Receiver Sensitivity (OMA)

Sen.



-12

dBm

2

Stressed Receiver Sensitivity (OMA)




-9.5

dBm

2

Average Receive Power


-14


2

dBm


Input Saturation Power (overload)

Psat

0.5



dBm


LOS Assert

LOSA

-30



dBm


LOS De-assert

LOSD



-15

dBm


Damage Threshold

THd

3



dBm


LOS Hysteresis

LOSH

0.5



dB


Notes:

1. Class 1 Laser Safety per FDA/CDRH and IEC-825-1 regulations.

2. Measured with Light source 1310nm, ER=3.5dB; BER =<10^-12 @ PRBS=2^31-1 NRZ.


Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified. It is compliant to SFF-8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales staff.

Parameter

Symbol

Min.

Max

Unit

Notes

Temperature monitor absolute error

DMI_ Temp

-3

3

degC

Over operating temp

Supply voltage monitor absolute error

DMI _VCC

-0.15

0.15

V

Full operating range

RX power monitor absolute error

DMI_RX

-3

3

dB


Bias current monitor

DMI_ bias

-10%

10%

mA


TX power monitor absolute error

DMI_TX

-3

3

dB



 Mechanical Dimensions

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Figure2. Mechanical Outline