Ascent Communication Technology

40G QSFP+ SR4 150 m

Ascent’s QSFP+ transceiver modules are designed for use in 40 Gigabit per second links over multimode fiber. They are compliant with the SFF-8436 and IEEE 802.3 40GBASE-SR4. Digital diagnostics functions are available via a I²C interface, including Tx and Rx power monitoring. The optical transceiver is compliant per the RoHS Directive 2011/65/EU. The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks. For module control, the control interface incorporates a Two Wire Serial interface of clock and data signals. Diagnostic monitors for VCSEL bias, module temperature, transmitted optical power, received optical power and supply voltage are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes. Fault detection or channel deactivation through the TWS interface will disable the channel. Status, alarm/warning and fault information are available via the TWS interface. The optical receiver portion of the transceiver incorporates a 4-channel PIN photodiode array, a 4- channel TIA array, a 4-channel output buffer, diagnostic monitors, and control and bias blocks. Diagnostic monitors for optical input power are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes.

· Compliant with SFF-8436

· Compliant with IEEE 802.3 40GBASE-SR4

· 850nm 4 VCSEL Lasers and 4 channels PIN photo detectors

· Maximum link length of 100m on OM3 MMF or 150m on OM4 MMF

· 3.3V Supply Voltage

· Max. Power<1.5W

· 0-70°C Case Operating Temperature

· MPO Receptacle

· Maximum Data Rate per Lane: 10.3125Gb/s

· 2-wire interface for management and DDM

· Complies with EU Directive 2011/65/EU

· Class 1 Laser

Absolute Maximum Ratings

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Storage Temperature	Ts	-40	-	+85	°C
Relative Humidity (non-condensing)	RH	5	-	95	%
Supply Voltage	Vcc	-0.5	-	3.6	V
Input Voltage	Vin	-0.5	-	Vcc+0.5	V

Recommended Operating Conditions

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Operating Case Temperature	T_OPR	0	-	70	°C
Power Supply Voltage	Vcc	3.135	3.3	3.465	V
Power Supply Current	Icc			475	mA
Maximum Power Consumption	P_D	-	-	1.5	W
Data Rate per Lane	DR	-	10.3125	-	Gb/s
Operating Distance (MMF OM3)	-	0.5	-	100	m
Operating Distance (MMF OM5)	-	0.5	-	150	m

Optical and Electrical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Transmitter
Mean Wavelength (Each Lane)	λ	840	850	860	nm
Data Rate per Lane	DR		10.3125		Gbps
Spectral Width (RMS)	Δλ			0.65	nm
Optical Power (Each Lane)	P_OUT	-7.6	-	2.4	dBm
OMA per Lane	P_oma	-5.6		3	dBm
Peak Power, each Lane	P_peak			4	dBm
Extinction Ratio	ER	3			dB
TDP, each Lane	TDP			3.5	dB
Optical Return Loss Tolerance				12	dB
Average Launch Power Tx_Off(Each Lane)				-30	dBm
Receiver
Wavelength(Each Lane)	λ	840	850	860	nm
Data rate per Lane	DR		10.3125		Gbps
Average Power at Receiver, each Lane	-	-9.5	-	2.4	dBm
Rx OMA per Lane	OMA	-	-	3	dBm
Stressed Receiver Sensitivity OMA (Each Lane)	SRS	-	-	-5.4	dBm
Peak Power(Each lane)	-	-	-	4	dBm
Receiver Reflectance	RX_R	-	-	-12	dB
LOS Assert	LOS_A	-30	-	-	dBm
LOS De-Assert	LOS_D	-	-	-12	dBm
LOS Hysteresis	-	0.5	-		dB

Note: Measured with a PRBS 2₃₁-1 test pattern @10.3125Gbps, BER≤10_-12.

High Speed Electrical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Supply Voltage	Vcc	3.135		3.465	V
Supply Current	Icc			450	mA
Input Differential Impedance		90	100	110	Ω
Differential Data Input Swing	V_{IN, P-P}	300	-	1100	mVpp
Differential Data Output Swing	V_{out, P-P}	300		850	mVpp
Input Logic Level High		2		Vcc
Input Logic Level Low		0		0.8
Output Logic Level High		Vcc-0.5		Vcc
Output Logic Level Low		0		0.4

2-Wire Electrical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Host 2-Wire Vcc Voltage	Vcc_Host_2w	3.14	-	3.46	V
SCL and SDA Voltage	V_OL	0	-	0.4	V
	V_OH	Vcc_Host_2w-0.5	-	Vcc_Host_2w+0.3	V
	V_IL	-0.3	-	VccT*0.3	V
	V_IH	VccT*0.7	-	VccT+0.5	V
Input Current on the SCL and SDA Contacts	Ii	-10	-	10	mA

2-Wire Timing Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Transmitter
Clock Frequency	f_scl	100		400	kHZ	1
Clock Pulse Width Low	t_low	1.3		-	µs
Clock Pulse Width High	t_high	0.6		-	µs
Time Bus Free before New Transmission Can Start	t_buf	20		-	µs	2
START Hold Time	t_HD,STA	0.6		0	µs
START Set-up Time	t_SU,STA	0.6		-	µs
Data In Hold Time	t_HD,DAT	0		-	µs
Data In Set-up Time	t_SU,DAT	0.1		-	µs
Input Rise Time(100kHz)	tr,100	-		1000	ns	3
Input Rise Time(400kHz)	tr,100	-		300	ns	3
Input Fall Time(100kHz)	tf,100	-		300	ns	4
Input Fall Time(400kHz)	tf,400	-		300	ns	4
STOP Set-up Time	t_SU,STO	0.6		-	us

Notes:

1. Module shall operate with fSCL up to 100 kHz without requiring clock stretching. The module may clock stretch with fSCL greater than 100 kHz and up to 400 kHz.

2. Between STOP and START and between ACK and ReSTART.

3. From (VIL,MAX-0.15) to (VIH,MIN+0.15).

4. From (VIH,MIN+0.15) to (VIL,MAX-0.15).

Memory Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Serial Interface Clock Holdoff “Clock Stretching”	T_clock_hold			500	µs	1
Complete Single or Sequential Write up to 4 Byte	tWR			40	ms
Complete Sequential Write of 5 to 8 Byte	tWR			80	ms
Endurance (Write Cycles)		10K	-	-	ms