image


Arista Compatible SFP-50G-LR-A-FL Quick Spec:

Part Number: SFP-50G-LR-A-FL

Arista SFP-50G-LR-A-FL Datasheet (50GBase, LR, SFP56, 1310nm, MMF, 100m, Dual-LC, COM) Fiber Optic Transceiver

SFP-50G-LR-A-EXT-FL SFP-50G-LR-A-IND-FL SFP-50G-LR-A-FLT

SFP-50G-LR-A-EXT-FLT SFP-50G-LR-A-IND-FLT


Form Factor: SFP56

TX Wavelength: 1310nm

Reach: 10km

Cable Type: SMF

Rate Category: 10G/25/50GBase

Interface Type: LR

DDM: Yes

Connector Type: Dual-LC


Arista Compatible SFP-50G-LR-A-FL Features


Product Description

The Arista Compatible SFP-50G-LR-A-FL optical transceiver supports high-speed serial links over single- mode optical fiber at signaling rates up to 57.8 Gb/s PAM4 (the serial line rate of 64GFC). The product is compliant with Small Form Pluggable SFP+ industry agreements for mechanical and low-speed electrical specifications. High-speed electrical and optical specifications are compliant with ANSI Fibre Channel FC-PI-7.


The SFP-50G-LR-A-FL is a multirate 1310-nm transceiver that ensures compliance with FC-PI-7 64GFC, 32GFC, and 16GFC specifications. Per the requirements of 64GFC, internal clock and data recovery circuits (CDRs) are present on both electrical input and electrical output of this transceiver. These CDRs lock at 57.8-Gb/s PAM4, 28.05-Gb/s NRZ, and 14.025-Gb/s NRZ (64GFC, 32GFC, and 16GFC) accomplished by using two Rate Select inputs and I2C to configure


image


transmit and receive sides.


Digital diagnostic monitoring information (DMI) is present in the SFP56-10/25/50GBase-LR per the requirements of SFF- 8472, providing real-time monitoring information of transceiver laser, receiver, and environment conditions over an SFF- 8431 I2C interface.


Regulatory Compliance


Feature

Standard

Performance

Electrostatic Discharge

( ESD) to the Electrical Pins

MIL-STD-883E

Method 3015.7

Class 1(>1000V for SFI pins, >2000V for other

pins.)

Electrostatic Discharge (ESD) to the Duplex LC Receptacle

IEC 61000-4-2

GR- 1089-CORE

Compatible with standards

Electromagnetic

Interference ( EMI)

FCC Part 15 Class B

EN55022 Class B (CISPR 22B)

Compatible with standards

Immunity

IEC 61000-4-3

Compatible with standards

Laser Eye Safety

FDA 21CFR 1040.10 and 1040.11 EN60950, EN (IEC)

60825- 1,2

Compatible with Class I laser product.

RoHS

EU 2015/863

Compliant with exemption 7C(I)


Arista Compatible SFP-50G-LR-A-FL Absolute Maximum Ratings

The operation in excess of any absolute maximum ratings might cause permanent damage to this module.


Parameter

Symbol

Min

Max

Unit

Notes

Storage Temperature

TS

-40

+85


Operating Relative Humidity

RH

10

+85

%



Arista Compatible SFP-50G-LR-A-FL Recommended Operating Conditions


Parameter

Symbol

Min

Typical

Max

Unit

Notes

Operating Case Temperature

TOP

-40


+85

I-temp

0


+70

C-temp

Power Supply Voltage

VCC

3.135

3.3

3.465

V


Power Dissipation

P

-

-

2

W


Data Rate

DR


26.5625

-

GBd


Transmission Distance

TD

-

-

10

km

1

Note:

  1. Measured with SMF.


    Arista Compatible SFP-50G-LR-A-FL Optical Characteristics

    All parameters are specified under the recommended operating conditions unless otherwise specified.


    Parameter

    Symbol

    Min

    Typical

    Max

    Unit

    Notes

    Transmitter

    Center Wavelength

    λC

    1304.5


    1317.5

    nm

    1

    1300


    1320


    2

    Modulation Format


    PAM4



    Average Output Power

    P0UT

    -4.5

    -

    4.2

    dBm


    Outer Optical Modulation Amplitude

    OMA

    - 1.5

    -

    4

    dBm


    TDECQ

    TDECQ



    3.2

    dB


    Average Output Power ( Laser Off)

    P0UT- OFF

    -

    -

    -30

    dBm


    Extinction Ratio

    ER

    3.5

    -

    -

    dB


    RIN15.6OMA

    -

    -

    -

    - 132

    dB/Hz


    Optical return loss tolerance

    -

    -

    -

    15.6

    dB


    Transmitter reflectance

    -

    -

    -

    -26

    dB


    Receiver

    Center Wavelength Range

    λC

    1295

    1311

    1325

    nm


    Damage threshold

    -

    -

    -

    5.2

    dBm

    3

    Average receive power


    - 10.8


    4.2

    dBm


    Receiver Power ( OMAouter)

    -

    -

    -

    4

    dBm

    4

    Receiver sensitivity ( OMAouter)


    Max(–8.4, SECQ – 9.8)

    dBm


    LOS Assert

    LOSA

    -30

    -


    dBm


    LOS De- assert

    LOSD

    -

    -

    - 11

    dBm


    LOS Hysteresis

    LOSH

    0.5

    -

    -

    dB


    Notes:

    1. For C temp 0~70°C

    2. For I temp -40~85°C

    3. The receiver shall be able to tolerate, without damage, continuous exposure to an optical signal having this average power level. The receiver does not have to operate correctly at this input power

    4. Measured with a PRBS31Q test pattern @26.5625 GBd, BER≤2.4X10^-4.


Arista Compatible SFP-50G-LR-A-FL Electrical Specifications


Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter (Module Input)

Differential Data Input Amplitude

VIN, P- P

180

-

900

mVpp


Input Differential Impedance

ZIN

90

100

110

Ω



Tx Fault

Normal Operation

VOL

-0.3

-

0.4

V


Transmitter Fault

VOH

2.4

-

VCC

V



Tx Disable

Normal Operation

VIL

-0.3

-

0.8

V


Laser Disable

VIH

2.0

-

VCC+0.3

V

Receiver (Module Output)

Differential Data Output Amplitude

VOUT,P

- P

300

-

1000

mVpp


Output Differential Impedance

ZO

90

100

110

Ω


Rx LOS

Normal Operation

VOL

-0.3

-

0.4

V


Lose Signal

VOH

2.4

-

VCC

V



Arista Compatible SFP-50G-LR-A-FL Digital Diagnostic Functions

Digital diagnostics monitoring function is available on FluxLight product. A 2-wire serial interface provides user to contact with module. It is compliant to SFF-8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales stuff.


Parameter

Symbol

Min

Max

Unit

Notes

Temperature monitor absolute error

DMI_Temp

-3

+3


Supply voltage monitor absolute error

DMI_VCC

-3%

+3%

V


TX power monitor absolute error

DMI_RX

-3

+3

dB


RX power monitor absolute error

DMI_RX

-3

+3

dB


Bias current monitor

DMI_Ibias

-10%

+10%

mA



Mechanical Dimensions



image


Arista Compatible SFP-50G-LR-A-FL Pin Assignment and Description


image

Pin Definitions


Contacts

Logic

Symbol

Description

Notes

case


case

Module case

2

1


VEET

Module Transmitter Ground

3

2

LVTTL-O

TX_ FAULT

Module Transmitter Fault

4


3


LVTTL- I

TX_ DISAB

L E

Transmitter Disable; Turns off transmitter laser output


5


4


LVTTL-I/O


SDA

2 - wire Serial Interface Data Line( Same as MOD- DEF2 in INF-8074i)


6


5


LVTTL-I/O


SCL

2 - wire Serial Interface Clock ( Same as MOD- DEF1 in INF-8074i)


6


6



MOD_ ABS

Module Absent, connected to VEET or VEE R in the module


7


7


LVTTL- I


RS0


Rx Rate Select



8


LVTTL-O


RX_LOS

Receiver Loss of Signal Indication( In FC

designated as Rx_ LOS and in Ethernet designated as Signal Detect)


4

9

LVTTL- I

RS1


Tx Rate Select





11


VEE R

Module Receiver Ground

3

12

CML- O

RD-

Receiver Inverted Data Output


13

CML- O

RD+

Receiver Non- Inverted Data Output


14


VEE R

Module Receiver Ground

3

15


VCC R

Module Receiver 3.3 V Supply


16


VCCT

Module Transmitter 3.3 V Supply


17


VEET

Module Transmitter Ground

3

18

CML- I

TD+

Transmitter Non- Inverted Data Input


19

CML- I

TD-

Transmitter Inverted Data Input


20


VEET

Module Transmitter Ground

3

image

10

VEE R

Module Receiver Ground

3

Notes:

  1. Labeling as inputs (I) and outputs (O) are from the perspective of the module .

  2. The case makes electrical contact to the cage before any of the board edge contacts are made.

  3. The module signal ground contacts, VeeR and VeeT, should be isolated from the module case.

  4. This contact is an open collector/ drain output contact and shall be pulled up on the host. Pull ups can be connected to one of several power supplies, however the host board design shall ensure that no module contact has voltage exceeding module VccT/ R + 0 . 5 V.

  5. Tx_Disable is an input contact with a 4.7 kOhms to 10 kOhms pullup to VccT inside the module.

  6. 2-wire interface.

  7. The pins shall be pulled up with 4.7K- 10Kohms to a voltage between 3. 14V and 3.46V on host board


Arista Compatible SFP-50G-LR-A-FL Rate Selection


Notes:

A2.73.bit 4 is default to 1b, RS0 and RS1 hardware pins state are ignored, module allows RS0(1) bits for 10G/25G rate selection


50G PMA4 Enable (A2.119.Bit2)

Soft RS0 select

(A2.110.bit3)

Soft RS1 select

(A2.118.bit3)

Rate

(both Tx&Rx)

0

0

x

10Gbps

0

1

x

25Gbps

1

x

x

50Gbps



Pin Assignment


PIN #

Symbol

Description

Notes

1

VeeT

Transmitter Ground


2

TX Fault

Transmitter Fault Indication

Note 1


3


TX Disable


Transmitter Disable

Note 2, Module disables on high or open

4

SDA

2-wire Serial Interface Data Line(Same as MOD-DEF2 in INF-8074i)


5

SCL

2 Wire Serial Interface Data Line (Same as MOD-DEF1 as defined in the INF-8074i)



6


MOD-ABS

Module Absent,Connected to VeeT or VeeR in the module.


Note 3


7

RS0

SFP+ RX Rate Select, optional

Rate Select0,Not used.Note 9

8

LOS

Loss of Signal

Note 4

9

RS1

SFP+ TX Rate Select, optional

Rate Select 1, Not used.Note 9

10

VeeR

Receiver Ground

Note 5

11

VeeR

Receiver Ground

Note 5

12

RD-

Inv. Received Data Out

Note 6

13

RD+

Received Data Out

Note 6

14

VeeR

Receiver Ground

Note 5

15

VccR

Receiver Power

image

Note 7, 3.3V 5%

16

VccT

Transmitter Power

Note 7, 3.3V 5%

17

VeeT

Transmitter Ground

Note 5

18

TD+

Transmit Data In

Note 8

19

TD-

Inv. Transmit Data In

Note 8

20

VeeT

Transmitter Ground

Note 5

Notes:

Plug Seq.: Pin engagement sequence during hot plugging.

  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 +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 < 0.4V.

  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 KΩ resistor. Its states are:

    Low (-0.3–0.8V):Transmitter on (>0.8, < 2.0V):Undefined

    High (2.0–VccT+0.3V):Transmitter Disabled Open:Transmitter Disabled

  3. Mod-ABS shall be pulled up with a 4. 7K–10KΩ resistor on the host board. The pull -up voltage shall VccT or VccR.

  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 VccR+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 < 0.4V.

  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.

  7. VccR and VccT are the receiver and transmitter power supplies. They are de fined 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 1Ω 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 30 m A 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.

  9. Internally pulled down per SFF-8431 Rev 4.1.


Licensing

The following U.S. patents are licensed by Finisar to FluxLight, Inc.:

U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720