Delta Electronics LCP-1250B4MDRx User Manual

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

 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-1250B4MDRx is 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-1250B4MDRx is designed to be

compliant with SFP Multi-source Agreement

(MSA). Digital diagnostic monitoring functions

(Temperature, V

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-1250B4MDRx

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.

, TX optical power, TX laser

CC

Applications

 Gigabit Ethernet

 Switch to Switch interface

 Switched backplane applications

 File server interface

Performance

 LCP-1250B4MDRx: 1310nm DFB laser, 19dB

link budget (40km)

DELTA ELECTRONICS, INC.

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Absolute Maximum Ratings

Parameter Symbol Min. Typ. Max. Unit Note

Storage Temperature Ts -40 85 ºC
Supply Voltage VCC 0 5 V

Recommended Operating Conditions

Parameter Symbol Min. Typ. Max. Unit Note

Case Operating Temperature TC -5 70 ºC 1
Supply Voltage VCC 3.135 3.465 V

Note 1: See order information

Electrical Characteristics

(VCC=3.3V ± 5%)

Parameter Symbol Min. Typ. Max. Unit Note

Total Supply Current ICCT 300 mA

Transmitter

Transmitter Differential Input Voltage VDT 0.5 2.4 V 1
Transmitter Disable Input-High V
Transmitter Disable Input-Low V
Transmitter Fault Pull up Resistor R
Transmitter Fault Output-High V
Transmitter Fault Output-Low V

DISH

DISL

TX_FAULT

TXFH

TXFL

Receiver

Receiver Differential Output Voltage VDR 0.35 2 V 3
Receiver LOS Load R
LOS Output Voltage-High V
LOS Output Voltage-Low V
Output Data Rise/Fall Time tr / t

RXLOS

LOSH

LOSL

f

Notes:

1. Internally AC coupled and terminated to 100Ohm differential load.

2 VCC+0.3 V
0 0.8 V

4.7 10 k 2

2 VCC+0.3 V 2
0 0.8 V 2

4.7 10 k 2

2 VCC+0.3 V 2
0 0.8 V 2

220 psec 4

2. Pull up to V

on host Board

CC

3. Internally AC coupled, but requires a 100Ohm differential termination at or internal to Serializer/

Deserializer.

4. These are 20%~80% values

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Optical Characteristics

(VCC=3.3V ± 5%, Data Rate=1250Mb/sec, PRBS=27-1 NRZ)

Parameter Symbol Min. Typ. Max. Unit Note

Transmitter

Output Optical Power (Avg.) P

O

Optical Extinction Ratio ER 9 dB
Center Wavelength
Spectral Width (-20dB)

λ

C

σ

Side-mode Suppression Ratio SMSR 30 dB
Optical Rise/ Fall Time tr/t

f

Relative Intensity Noise RIN -120 dB/Hz
Output Eye

Compliant with IEEE 802.3z

Receiver

Sensitivity (Avg.) P
Input Optical Wavelength
LOS-Deasserted (Avg.) P
LOS-Asserted (Avg.) P
LOS-Hysteresis PA-P
Overload (Avg.) P

IN

λ

A

D

D

O

Notes:

1. These are unfiltered 20%~80% values

2. The sensitivity is provided at a BER of 1×10

7

2

-1 PRBS and ER=9dB.

-4 1 dBm

1274 1310 1355 nm

1 nm

260 psec 1

-23 dBm 2

1270 1570 nm

-23 dBm

-40 dBm

0.5 dB

-1 dBm

-12

or better with an input signal consisting of 1250Mb/s,

Mask of the eye diagram for the optical transmit signal

DELTA ELECTRONICS, INC.

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SFP Transceiver Electrical Pad Layout

Pin Function Definitions

Pin Num. Name Function Plug Seq. Notes

1 VeeT Transmitter Ground 1
2 TX Fault Transmitter Fault Indication 3 Note 1

3 TX Disable Transmitter Disable 3

4 MOD-DEF2 Module Definition 2 3 Note 3, 2 wire serial ID interface
5 MOD-DEF1 Module Definition 1 3 Note 3, 2 wire serial ID interface
6 MOD-DEF0 Module Definition 0 3 Note 3, Grounded in Module
7 Rate Select Not Connect 3 Function not available
8 LOS Loss of Signal 3 Note 4

9 VeeR Receiver Ground 1 Note 5
10 VeeR Receiver Ground 1 Note 5
11 VeeR Receiver Ground 1 Note 5
12 RD- Inv. Received Data Out 3 Note 6
13 RD+ Received Data Out 3 Note 7
14 VeeR Receiver Ground 1 Note 5
15 VccR Receiver Power 2 3.3 ± 5%, Note 7
16 VccT Transmitter Power 2 3.3 ± 5%, Note 7
17 VeeT Transmitter Ground 1 Note 5
18 TD+ Transmit Data In 3 Note 8
19 TD- Inv. Transmit Data In 3 Note 8
20 VeeT Transmitter Ground 1 Note 5

Plug Seq.: Pin engagement sequence during hot plugging.

Note 2
Module disables on high or open

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Notes:

1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10K 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  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 –

10Kresistor 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 – 10K

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 100 differential lines which

should be terminated with 100 (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 100

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.

DELTA ELECTRONICS, INC.

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