Cisco Compatible SFP-25GBX-U-10 Quick Spec:

A close up of electronics Description generated with high confidence

Part Number: SFP28-25GBASE-BX-10 SFP28-25GBASE-BX-10-EXT SFP28-25GBASE-BX-10-IND

Form Factor: SFP28

TX Wavelength: 1270/1330nm

Reach: 10km

Cable Type: SMF

Rate Category: 25GBase

Interface Type: BX

DDM: Yes

Connector Type: Single-LC

Cisco Compatible SFP-25GBX-U-10 Features

Supports 25.78125Gb/s serial optical interface
Up to 10km transmission on SMF
Un-cooled DFB laser and PIN receiver
Hot-pluggable SFP28 footprint
Built-in digital diagnostic functions
Single +3.3V power supply
Power consumption less than 1.2 W
Operating case temperature
- Standard: 0°C to +70 °C
- Extended -5°C to +85 °C
- Industrial -40°C to +85 °C
Internal CDR on both transmitter and receiver channel
Support CDR bypass
SFP28 MSA package with simplex LC connector, Bi-directional
Compliant with SFF-8402 and SFF-8472
Compliant to SFF-8431 and SFF-8432
Compliant with IEEE 802.3by 25GBASE-LR
Compliant with FCC 47 CFR Part 15, Class B
Compliant with Telcordia GR-468-CORE
RoHS Compliant

Cisco Compatible SFP-25GBX-U-10 Applications
25GBASE-BX 25G Ethernet
25.78125 Gb/s single lane 100GE LR4
Other optical links

Product Description

The SFP28 transceivers are high performance, cost effective modules supporting data rate of 25.78125Gbps and 10km transmission distance with SMF. The transceiver consists of three sections: a Un-cooled DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy y class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement and SFF-8472 digital diagnostics functions.

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Figure 1. Transceiver functional Block Diagram

Absolute Maximum Ratings

Table 2. Absolute Maximum Ratings

(Exceeding the limits below may damage the transceiver module permanently)

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Maximum Supply Voltage	VCC	-0.5	-	+4.0	V
Storage Temperature	TS	-40	-	+85	°C
Case Operating Temperature- Commercial	TA	0	-	+70	°C
Case Operating Temperature-Industrial	TA	-40	-	+85	°C
Relative Humidity	RH	5	-	85	%	1

Notes:

Non-condensing.

Recommend Operation Environment

Table 3. Recommend Operation Environment

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Data Rate	BR	-	25.78125	-	Gbps
Power Supply Voltage	VCC	3.13	3.3	3.47	V
Power Supply Current	ICC	-	-	350	mA
Power Dissipation	PD	-	-	1.2	W
Case Operating Temperature	TA	-5	-	+70	°C
Transmission Distance	TD	-	-	10	km	1

Notes:

Measured with ITU-T G.652 SMF

Electricalptical Characteristics

Table 4. Electrical Characteristics (TOP = -5 to +70 °C, VCC = 3.13 to 3.47 V)

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Transmitter
Differential Data Input Amplitude	VIN,P-P	180	-	1200	mVpp	1
Input Differential Impedance	ZIN	90	100	110	Ω
Transmitter Fault Output-High	VOH	2.0	-	VCC	V
Transmitter Fault Output-Low	VOL	0	-	0.8	V
Transmitter Disable Voltage- High	VIH	2.0	-	VCC	V
Transmitter Disable Voltage- low	VIL	0	-	0.8	V
Receiver
Differential output voltage swing	VOUT,P-P	300	-	850	mVpp	1
Output Differential Impedance	ZOUT	90	100	110	Ω
Deterministic Jitter	DJ	-	-	0.42	UI
Total Jitte	TJ	-	-	0.70	UI
LOS Output Voltage-High	VLOSH	2.0	-	VCC	V
LOS Output Voltage-Low	VLOSL	-	-	0.8	V

Notes:

CML input/output, internally AC-coupled and terminated.

Optical Characteristics

Table 5. Optical Characteristics (TOP = -5 to +70 °C, VCC = 3.13 to 3.47 V)

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Transmitter
Optical Center Wavelength (LR2733)	λC	1260	1270	1280	nm
Optical Center Wavelength (LR3327)	λC	1320	1330	1340	nm
Data Rate	BR	-	25.78125	-	Gbps
Average Output Power	PO	-7.0	-	+2.0	dBm
Optical Modulation Amplitude	POMA	-4.0	-	+2.2	dBm
Optical Extinction Ratio	ER	3.5	-	-	dB
RMS Spectral Width (-20dB)	Δσ	-	-	1.0	nm
Side Mode Suppression Ratio	SMSR	30	-	-	dB
Relative Intensity Noise	RIN	-	-	-130	dB/Hz
Optical Return Loss Tolerance	ORL	-	-	20	dB
Transmitter Reflectance	RT	-	-	-12	dB
Average Launch power of Tx OFF	POFF	-	-	-30	dBm
Optical Eye Mask	Compliant with IEEE 802.3by
Receiver
Center Wavelength Range (LR2733)	λC	1320	-	1340	nm
Center Wavelength Range (LR3327)	λC	1260	-	1280	nm
Data Rate	BR	-	25.78125	-	Gbps
Maximum Receiver Power (OMA)	RPOMA	-	-	+2.2	dBm	1
Average Receive Power	RPO	-11.3	-	+2.0	dBm
Receiver Sensitivity (OMA)	RSENS	-	-	-11.3	dBm
Stressed Receiver Sensitivity (OMA)	RSRS	-	-	-8.8	dBm	1
LOS Assert	LOSA	-25	-	-	dBm
LOS De-Assert	LOSD	-	-	-15	dBm
LOS Hysteresis	LOSH	0.5	-	5	dB
Receiver Reflectance	RR	-	-	-26	dB

Notes:

For 25G-LR with FEC, receiver sensitivity is defined at 5E-5 BER level, not 10-12 BER level.

Table 6. Timing and Electrical

Parameter	Symbol	Min	Typ	Max	Unit
Tx Disable Negate Time	t_on	-	-	1	ms
Tx Disable Assert Time	t_off	-	-	10	µs
Time To Initialize, including Reset of Tx Fault	t_init	-	-	300	ms
Tx Fault Assert Time	t_fault	-	-	100	µs
Tx Fault To Reset	t_reset	10	-	-	µs
LOS Assert Time	t_loss_on	-	-	100	µs
LOS De-assert Time	t_loss_off	-	-	100	µs
Rate-Select Change Time	t_ratesel	-	-	10	µs
Serial ID Clock Rate	f_serial_clock	-	100	400	KHZ
SDA, SCL, MOD_ABS High Level	VH	2.0	-	VCC	V
SDA, SCL, MOD_ABS Low Level	VL	-	-	0.8	V

Pin Assignment

Table 7. Pin Descriptions

Notes:

1. Open collector/drain output, which should be pulled up with a 4.7kΩ to 10kΩ resistor on the host board if intended for use. Pull up voltage should be between 2.0V to 3.6V. A high output indicates a transmitter fault caused by either the TX bias current or the TX output power exceeding the preset alarm thresholds. A low output indicates normal operation. In the low state, the output is pulled to <0.8V.

Laser output disabled on Tx_Disable >2.0V or open, enabled on Tx_Disable <0.8V.
LOS is open collector output. Should be pulled up with 4.7kΩ to 10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100Ω differential lines which should be terminated with 100Ω (differential) at the user SERDES.
TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

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Figure 2. Host PCB SFP+ pad assignment top view and Names.

Digital Diagnostic Memory Map

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.

Table 8. Digital Diagnostic Memory Map (Specific Data Field Descriptions)

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Table 9. Digital Diagnostic Monitor Characteristics

Parameter	Calibration	Range	Accuracy	Unit
Transceiver Internal Temperature	Internal	-5 to +70°C	±3.0	°C
VCC3 Internal Supply Voltage	Internal	3.0 to 3.6V	±3.0	%
Laser Bias Current	Internal	0 to 90mA	±10	%
Tx Output Power	Internal	-7.0 to +3.0dBm	±3.0	dBm
Rx Input Power	Internal	-14.0 to +3.0dBm	±3.0	dBm

Recommended Circuit

Figure 3, Recommended Host Board Power Supply Circuit

Figure 4, Recommended Interface Circuit

Mechanical Dimensions

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Warnings

Figure 5, Mechanical Dimensions

Handling Precautions: This device is susceptible to damage as a result of electrostatic discharge (ESD). A static free environment is highly recommended. Follow guidelines according to proper ESD procedures.

Laser Safety: Radiation emitted by laser devices can be dangerous to human eyes. Avoid eye exposure to direct or indirect radiation.

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