QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
QSFP TO 4xSFP+ AOC
Ordering Information
TQS–21LH8–XCAxx
Distance (L1)
Distance (L2)
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
1
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Features
 Full-Duplex & 10-Gbps per lane with maximum aggregate speed of 40-Gbps.
 Bit-Error-Rate (BER) better than 10-12
 3.3V single power supply
 Low power consumption of max. 1.5W at QSFP+ and max. 0.5W at SFP+ side
 Hot pluggable interface
 Designed to meet MAS SFF-8436(QSFP+), SFF-8431 and SFF-8472 (SFP+)
 Programmable EEPROM for serial identification through I2C interface
 RoHS compliant
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Note
Storage temperature
TS
0
70
C
1
3.3V Power Supply voltage
VCC
-0.5
3.6
V
Data Input Voltage – Single Ended
Vin
-0.5
Vcc+0.5
V
Relative humidity
RH
5
85
%
Control Input Voltage
Vinc
-0.5
3.6
V
2
Note:
1. Limited by the fiber cable jacket, not the active ends.
2. Non-condensing.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
2
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Recommended Operating Conditions
Parameter
Symbol
Min
Tc
0
Power Supply voltage
VCC
3.14
Data Rate per Channel
DR
10.3125
BER
10-12
Case Operating Temperature
Bit Error Ratio
Typ
3.3
Max
Unit
70
℃
3.47
V
Gbps
1
Control Input Voltage High
VIN-H
2
Vcc+0.3
V
Control Input Voltage Low
VIN-L
-0.3
0.8
V
Two Wire Serial (TWS) Interface Clock Rate
Differential Data Input / Output Load
R
Note
100
kHz
100
Ohms
Note:
1. Bit-Error-Rate (BER) is tested with PRBS 231-1 pattern.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
3
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Electrical Characteristics for QSFP+ Module
Parameter
Min
Typ
Max
Unit Note
Transceiver
Transceiver Power Consumption
1.5
W
Transceiver Power Supply Current
420
mA
Transceiver Power-On Initialization Time
2000
ms
1200
mVpp
1
Transmitter
Data Input Differential Peak-to-Peak
Voltage Swing
Differential Input Return Loss
Per IEEE 802.3ba, Section 86A.4.1.1
dB
2
10
dB
2
J2 Jitter Tolerance
0.17
UI
J9 Jitter Tolerance
0.29
UI
Differential to Common Mode Input Return Loss
Receiver
Data Output Differential Peak-to-Peak
Voltage Swing
200
Output Transition Time 20% to 80%
28
900
mVpp
3
ps
Differential Output Return Loss
Per IEEE 802.3ba, Section 86A.4.2.1
dB
2
Common Mode Output Return Loss
Per IEEE 802.3ba, Section 86A.4.2.2
dB
2
Output Total Jitter
62
ps
J2 Jitter Output
0.42
UI
J9 Jitter Output
0.65
UI
Eye Mask Coordinates:
X1, X2; Y1, Y2.
Specification Value
0.29, 0.5; 150, 425.
UI; mV
4
Note:
1. “Initialization Time” is the time from when the supply voltages reach and remain
above the minimum “Recommended Operating Conditions” to the time when the
module enables TWS access. The module at that point is fully functional.
2. 10M to 11.1 GHz according to IEEE 802.3ba specification.
3. AC-Coupled with 100Ω differential output impedance.
4. Hit ratio= 5 × 10-5 per sample with mask definition per below figure.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
4
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Electrical Characteristics for SFP+ Module
Parameter
Min
Typ
Max
Unit
Transceiver Power Consumption
0.5
W
Transceiver Power Supply Current
140
mA
Transceiver Power-On Initialization Time
300
ms
1200
mVpp
Note
Transceiver
1
Transmitter
Data Input Differential Peak-to-Peak
Voltage Swing
300
Differential Input Return Loss
-10
dB
2
mVpp
3
2
Receiver
Data Output Differential Peak-to-Peak
Voltage Swing
500
Differential Output Return Loss
-10
dB
Output Rise & Fall Time (20-80)
28
ps
850
Total Jitter
Eye Mask Coordinates:
X1, X2; Y1, Y2
0.7
Specification Value
0.35, 0.5; 150, 425
UI
UI; mV
4
Note:
1. “Initialization Time” is the time from when the supply voltages reach and remain
above the minimum “Recommended Operating Conditions” to the time when the
module enables TWS access. The module at that point is fully functional.
2. SDD11/22 differential input and output return loss from 0.05G to 3.9G.
3. AC-Coupled with 100Ω differential output impedance.
4. Hit ratio= 5 × 10-5 per sample with mask definition per below figure.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
5
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Optical Cable Specification 
QSFP+ end to break-out region
Parameter
Specification
Notes
Minimum Cable Bending Radius
30 mm
Cable Cross-Section Dimension
Round Cable with 3-mm in Diameter
Cable Cover Type
LSZH
1
Cable Length Tolerance
L-m + 100/-0 cm
TBD
Specification
Notes

SFP+ end to break-out region
Parameter
Minimum Cable Bending Radius
30 mm
Cable Cross-Section Dimension
Round Cable with 2-mm in Diameter
Cable Cover Type
LSZH
Standard Cable Length
1-m +0.1m / -0m
1
Note:
1. Cable cover type standard is LSZH. Other types can be available upon request.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
6
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
QSFP+ Module Pad Assignments and Descriptions
.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Logic
Symbol
Description
Plug
Sequence
CML-O
CML-O
GND
Tx2n
Tx2p
GND
Tx4n
Tx4p
GND
ModSelL
ResetL
Vcc Rx
SCL
SDA
GND
Rx3p
Rx3n
Ground
Transmitter Inverted Data Input
Transmitter Non-Inverted Data Input
Ground
Transmitter Inverted Data Input
Transmitter Non-Inverted Data Input
Ground
Module Select
Module Reset
+3.3V Power Supply Receiver
2-wire serial interface clock
2-wire serial interface data
Ground
Receiver Non-Inverted Data Output
Receiver Inverted Data Output
1
3
3
1
3
3
1
3
3
2
3
3
1
3
3
16
17
CML-O
GND
Rx1p
Ground
Receiver Non-Inverted Data Output
1
3
18
CML-O
Rx1n
Receiver Inverted Data Output
3
CML-I
CML-I
CML-I
CML-I
LVTTL-I
LVTTL-I
LVCMOS-I/O
LVCMOS-I/O
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Notes
1
1
1
2
2
1
Version 01
Page
7
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Pin
Logic
19
Symbol
GND
20
Description
Ground
Plug
Sequence
Notes
1
1
1
GND
Ground
1
21
CML-O
Rx2n
Receiver Inverted Data Output
3
22
CML-O
Rx2p
Receiver Non-Inverted Data Output
3
GND
Ground
1
23
24
CML-O
Rx4n
Receiver Inverted Data Output
3
25
CML-O
Rx4p
Receiver Non-Inverted Data Output
3
GND
Ground
1
26
1
1
27
LVTTL-O
ModPrsL
Module Present
3
28
LVTTL-O
IntL
Interrupt
3
29
Vcc Tx
+3.3V Power supply transmitter
2
2
30
Vcc1
+3.3V Power supply
2
2
LPMode
Low Power Mode
3
GND
Ground
1
31
LVTTL-I
32
33
CML-I
Tx3p
Transmitter Non-Inverted Data Input
3
34
CML-I
Tx3n
Transmitter Inverted Data Input
3
GND
Ground
1
35
36
CML-I
Tx1p
Transmitter Non-Inverted Data Input
3
37
CML-I
Tx1n
Transmitter Inverted Data Input
3
GND
Ground
1
38
1
1
1
Note:
1. GND is the symbol for signal and supply (power) common for the QSFP+ module.
All are common within the QSFP+ module and all module voltages are referenced
to this potential unless otherwise noted. Connect these directly to the host board
signal-common ground plane.
2. Vcc Rx, Vcc1 and Vcc Tx are the receiver and transmitter power supplies and shall
be applied concurrently. Requirements defined for the host side of the Host Edge
Card Connector are listed in Table. Recommended host board power supply
filtering is shown in next page. Vcc Rx Vcc1 and Vcc Tx may be internally
connected within the QSFP+ module in any combination. The connector pins are
each rated for a maximum current of 500 mA.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
8
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
SFP+ Module Pad Assignments and Descriptions
Pin
Logic
1
VeeT
2
Tx_Fault
3
Symbol
Description
Plug
Sequence
Notes
Module Transmitter Ground
1
LVTTL-O
Not supported.
3
Tx_Disable
LVTTL-I
Not supported.
3
4
SDA
LVTTL-I/O
2-wire Serial Interface Data Line
2
5
SCL
LVTTL-I/O
2-wire Serial Interface Clock
2
6
Mod_ABS
Module Absent
2
7
RS0
LVTTL-I
Not supported.
3
8
Rx_LOS
LVTTL-O
Not supported.
2
9
RS1
LVTTL-I
Not supported.
3
10
VeeR
Module Receiver Ground
1
11
VeeR
Module Receiver Ground
1
12
RD-
CML-O
Receiver Inverted Data Output
13
RD+
CML-O
Receiver Non-Inverted Data Output
14
VeeR
Module Receiver Ground
1
15
VccR
Module Receiver 3.3 V Supply
4
16
VccT
Module Transmitter 3.3 V Supply
4
17
VeeT
Module Transmitter Ground
1
18
TD+
CML-I
Transmitter Non-Inverted Data Input
19
TD-
CML-I
Transmitter Inverted Data Input
20
VeeT
Module Transmitter Ground
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
1
Version 01
Page
9
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Note:
1. Module circuit ground pins are isolated from the module chassis ground.
2. Pullup to VccHost with 4.7k – 10k .
3. No connection required.
4. Power supply filtering circuit required.
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
10
QSFP to 4xSFP+ AOC Transceiver
PRODUCT NUMBER: TQS-21LH8-XCAxx
Mechanical Design Diagram (Unit: mm)
Formerica OptoElectronics Inc .
5F-11, No.38, Taiyuan St.,Zhubei City,
Hsinchu County 30265, Taiwan
Ph: +886-3-5600286 Fax: +886-3-5600239
Version 01
Page
11