100G QSFP28 SR4

100G-QSFP28-SR4 Features
Four-channel full-duplex transceiver modules
Transmission data rate up to 26Gbit/s per channel
Up to 70m on OM3 Multimode Fiber (MMF)and 100m on OM4 MMF
Low power consumption <3.5W
Operating case temperature 0°C to +70°C
3.3V power supply voltage
RoHS 6 compliant
Hot Pluggable QSFP form factor
MPO connector receptacle
Built-in digital diagnostic function

100G-QSFP28-SR4 Applications
IEEE 802.3bm 100GBASE SR4 and 40GBASE SR4
Proprietary High Speed Interconnections
Data center

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

Parameter	Symbol	Min	Max	Unit	Note
Storage Temperature	TST	-40	85	degC
Relative Humidity(non-condensing)	RH	0	85	%
Operating Case Temperature	TOPC	0	70	degC
Supply Voltage	VCC	-0.3	3.6	V
Input Voltage	Vin	-0.3	Vcc+0.3	V

Recommended Operating Conditions and Supply Requirements

Parameter	Symbol	Min	Typical	Max	Unit
Operating Case Temperature	TOPC	0		70	degC
Power Supply Voltage	VCC	3.13	3.3	3.47	V
Power Consumption		–		3.5	W
Data Rate	DR		25.78125		Gbps
Data Speed Tolerance	∆DR	-100		+100	ppm
Link Distance with OM3 fiber	D	0		70	m

Optical Characteristics
All parameters are specified under the recommended operating conditions with PRBS31 data pattern unless otherwise specified.

Parameter	Symbol	Min		Typical		Max	Unit	Notes
	Transmitter
Center Wavelength	λC		840		850	860	nm	1
RMS Spectral Width	λrms		–			0.65	nm	1
Average Launch Power, each lane	PAVG		-7		-2.5	0	dBm
Optical Modulation Amplitude	POMA		-5		-2.5	0	dBm	1

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(OMA)
Difference in Launch Power between any two lanes	Ptx,diff				4.0	dB
Launch Power in OMA minus Transmitter and Dispersion Penalty (TDP), each Lane	OMA-TDP				3.5	dB		1
Extinction Ratio	ER		3.5			dB
Transmitter Eye Mask Margin	EMM		10			%		2
Average Launch Power OFF Transmitter, each Lane	Poff				-30	dBm
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}	{0.3, 0.38, 0.45, 0.35, 0.41, 0.5}
Parameter	Symbol	Min		Typical	Max	Unit		Notes
Receiver
Center Wavelength	λC	840		850	860		nm
Damage Threshold	THd	+3					dBm
Overload, each lane	OVL	+2.4					dBm
Receiver Sensitivity in OMA, each Lane	SEN				-10.3		dBm
Signal Loss Assert Threshold	LOSA	-30					dBm
Signal Loss Deassert Threshold	LOSD				-9		dBm
LOS Hysteresis	LOSH	0.5			6		dB
Optical Return Loss	ORL				-12		dBm

Notes:

1. Transmitter wavelength, RMS spectral width and power need to meet the OMA minus TDP specs to guarantee link performance.
2. The eye diagram is tested with 1000 waveform.

Electrical Specifications

Parameter	Symbol	Min	Typical	Max	Unit
Differential input impedance	Zin	90	100	110	ohm

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Differential Output impedance	Zout	90	100	110	ohm
Differential input voltage amplitude	ΔVin	300		1100	mVp-p
Differential output voltage amplitude	ΔVout	500		800	mVp-p
Bit Error Rate	BR			E-12
Input Logic Level High	VIH	2.0		VCC	V
Input Logic Level Low	VIL	0		0.8	V
Output Logic Level High	VOH	VCC-0.5		VCC	V
Output Logic Level Low	VOL	0		0.4	V

Pin Descriptions

PIN	Logic	Symbol	Name/Description	Note
1		GND	Ground	1
2	CML-I	Tx2n	Transmitter Inverted Data Input
3	CML-I	Tx2p	Transmitter Non-Inverted Data output
4		GND	Ground	1
5	CML-I	Tx4n	Transmitter Inverted Data Input
6	CML-I	Tx4p	Transmitter Non-Inverted Data output
7		GND	Ground	1
8	LVTLL-I	ModSelL	Module Select
9	LVTLL-I	ResetL	Module Reset
10		VccRx	﹢3.3V Power Supply Receiver	2
11	LVCMOS-I/O	SCL	2-Wire Serial Interface Clock
12	LVCMOS-I/O	SDA	2-Wire Serial Interface Data
13		GND	Ground
14	CML-O	Rx3p	Receiver Non-Inverted Data Output
15	CML-O	Rx3n	Receiver Inverted Data Output
16		GND	Ground	1
17	CML-O	Rx1p	Receiver Non-Inverted Data Output
18	CML-O	Rx1n	Receiver Inverted Data Output
19		GND	Ground	1
20		GND	Ground	1
21	CML-O	Rx2n	Receiver Inverted Data Output
22	CML-O	Rx2p	Receiver Non-Inverted Data Output
23		GND	Ground	1
24	CML-O	Rx4n	Receiver Inverted Data Output	1

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25	CML-O	Rx4p	Receiver Non-Inverted Data Output
26		GND	Ground	1
27	LVTTL-O	ModPrsL	Module Present
28	LVTTL-O	IntL	Interrupt
29		VccTx	+3.3 V Power Supply transmitter	2
30		Vcc1	+3.3 V Power Supply	2
31	LVTTL-I	LPMode	Low Power Mode
32		GND	Ground	1
33	CML-I	Tx3p	Transmitter Non-Inverted Data Input
34	CML-I	Tx3n	Transmitter Inverted Data Output
35		GND	Ground	1
36	CML-I	Tx1p	Transmitter Non-Inverted Data Input
37	CML-I	Tx1n	Transmitter Inverted Data Output
38		GND	Ground	1

Notes:

1. Module circuit ground is isolated from module chassis ground within the module. GND is the symbol for signal and supply (power) common for QSFP modules.
2. The connector pins are each rated for a maximum current of 500mA.

ModSelL Pin
The ModSelL is an input pin. When held low by the host, the module responds to

2-wire serial communication commands. The ModSelL allows the use of multiple QSFP

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modules on a single 2-wire interface bus. When the ModSelL is “High”, the module will not respond to any 2-wire interface communication from the host. ModSelL has an internal pull-up in the module.
ResetL Pin
Reset. LPMode_Reset has an internal pull-up in the module. A low level on the ResetL pin for longer than the minimum pulse length (t_Reset_init) initiates a complete module reset, returning all user module settings to their default state. Module Reset Assert Time (t_init) starts on the rising edge after the low level on the ResetL pin is released. During the execution of a reset (t_init) the host shall disregard all status bits until the module indicates a completion of the reset interrupt. The module indicates this by posting an IntL signal with the Data_Not_Ready bit negated. Note that on power up (including hot insertion) the module will post this completion of reset interrupt without requiring a reset.
LPMode Pin
Huihongfiber QSFP28 SR4 operate in the low power mode (less than 1.5 W power consumption) This pin active high will decrease power consumption to less than 1W.
ModPrsL Pin
ModPrsL is pulled up to Vcc on the host board and grounded in the module. The ModPrsL is asserted “Low” when the module is inserted and deasserted “High” when the module is physically absent from the host connector.
IntL Pin
IntL is an output pin. When “Low”, it indicates a possible module operational fault or a status critical to the host system. The host identifies the source of the interrupt by using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled up to Vcc on the host board.
Power Supply Filtering
The host board should use the power supply filtering shown in Figure 1.

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Figure1. Host Board Power Supply Filtering
Optical Interface Lanes and Assignment
The optical interface port is a male MPO connector .The four fiber positions on the left as shown in Figure 2, with the key up, are used for the optical transmit signals (Channel 1 through4). The fiber positions on the right are used for the optical receive signals (Channel 4 through 1). The central four fibers are physically present.

Figure 2. Optical Receptacle and Channel Orientation
Diagnostic Monitoring Interface
Digital diagnostics monitoring function is available on all HUIHONGFIBER QSFP28 SR4. A 2-wire serial interface provides user to contact with module. The structure of the memory is shown in Figure 3. The memory space is arranged into a lower, single page, address space of 128 bytes and multiple upper address space pages. This structure

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permits timely access to addresses in the lower page, such as Interrupt Flags and Monitors. Less time critical time entries, such as serial ID information and threshold settings, are available with the Page Select function. The interface address used is A0xh and is mainly used for time critical data like interrupt handling in order to enable a one-time-read for all data related to an interrupt situation. After an interrupt, IntL, has been asserted, the host can read out the flag field to determine the affected channel and type of flag.

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	-0.1	0.1	V	Full operating range
Channel RX power monitor absolute error	DMI_RX	-3	3	dB	Per channel
Channel Bias current monitor	DMI_Ibias	-10%	10%	mA	Per channel

Figure 3

EEPROM Serial ID Memory Contents:

Serial ID: Data Fields (Page 00)

Address	Size (Bytes)	Name	Description of Base ID Field	Optical Module
128	1	Identifier	Identifier Type of serial Module	R
129	1	Ext. Identifier	Extended Identifier of Serial Module	R
130	1	Connector	Code for connector type	R
131-138	8	Specification compliance	Code for electronic compatibility or optical compatibility	R
139	1	Encoding	Code for serial encoding algorithm	R
140	1	BR, nominal	Nominal bit rate, units of 100 MBits/s	R
141	1	Extended rateselect Compliance	Tags for extended rate select compliance	R
142	1	Length(SMF)	Link length supported for SMF fiber in km (note 1)	R
143	1	Length(OM3 50 um)	Link length supported for EBW 50/125 um fiber (OM3), units of 2m (note 1)	R

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144	1	Length(OM2 50 um)	Link length supported for 50/125 um fiber (OM2), units of 1m (note 1)		R
145	1	Length(OM1 62.5 um)	Link length 62.5/125 um units of 1m	supported for fiber (OM1), (note 1)	R
146	1	Length (Copper)	Link length of copper or active cable, units of 1 m (note 1)Link length supported for 50/125 um fiber (OM4), units of 2 m) when Byte 147 declares 850 nm VCSEL as defined in Table 37		R
147	1	Device tech	Device technology		R
148-163	16	Vendor name	QSFP28 vendor name(ASCII)		R
164	1	Extended Module	Extended Module codes for InfiniBand		R
165-167	3	Vendor OUI	QSFP28 vendor IEEE company ID		R
168-183	16	Huihongfiber PN	Part number provided by QSFP28 vendor(ASCII)		R
184-185	2	Vendor rev	Revision level for part number provided by vendor(ASCII)		R
186-187	2	Wave length or Copper cable Attenuation	Nominal laser wavelength (wavelength=value/20 in nm) or copper cable attenuation in dB at 2.5GHz (Adrs 186)and 5.0GHz (Adrs 187)		R
188-189	2	Wavelength tolerance	Guaranteed range of laser wavelength(+/- value) from nominal wavelength.(wavelength Tol.=value/200 in nm)		R
190	1	Max case temp.	Maximum case temperature in degrees C		R
191	1	CC_BASE	Check code for base ID fields (addresses 128-190)		R
192-195	4	Options	Rate Select, TX Disable, TX Fault, LOS, Warning indicators for: Temperature, VCC, RX power, TX Bias		R
196-211	16	Vendor SN	Serial number provided by vendor (ASCII)		R
212-219	8	Date Code	Vendor’s manufacturing date code		R
220	1	Diagnostic Monitoring Type	Indicates which types of diagnostic monitoring are implemented (if any) in the Module. Bit 1,0 Reserved		R
221	1	Enhanced Options	Indicates which optional enhanced features are implemented in the Module.		R
222	1	Reserved

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223	1	CC_EXT	Check code for the Extended ID Fields (addresses 192-222)	R
Vendor Specific ID Fields
224-255 32       Vendor Specific EEPROM

Mechanical Dimensions
ESD
This transceiver is specified as ESD threshold 1KV for high speed data pins and 2KV for all others    electrical      input      pins,      tested    per       MIL-STD-883,      Method 3015.4 /JESD22-A114-A (HBM).     However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.
Laser Safety
This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007)