200G QSFP-DD-2xQSFP28 Direct Attach Cable (DAC)

Pin

Logic

Symbol

Description

1

GND

Ground

2

CML-I

Tx2n

Transmitter Inverted Data Input

3

CML-I

Tx2p

Transmitter Non-Inverted Data Input

4

GND

Ground

5

CML-I

Tx4n

Transmitter Inverted Data Input

6

CML-I

Tx4p

Transmitter Non-Inverted Data Input

7

GND

Ground

8

LVTTL-I

ModSelL

Module Select

9

LVTTL-I

ResetL

Module Reset

10

Vcc Rx

+3.3V Power Supply Receiver

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

17

CML-O

Rx1p

Receiver Non-Inverted Data Output

18

CML-O

Rx1n

Receiver Inverted Data Output

19

GND

Ground

20

GND

Ground

21

CML-O

Rx2n

Receiver Inverted Data Output

22

CML-O

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

24

CML-O

Rx4n

Receiver Inverted Data Output

25

CML-O

Rx4p

Receiver Non-Inverted Data Output

26

GND

Ground

27

LVTTL-O

ModPrsL

Module Present

28

LVTTL-O

IntL

Interrupt

29

Vcc Tx

+3.3V Power supply transmitter

30

Vcc1

+3.3V Power supply

31

LVTTL-I

LPMode

Low Power Mode

32

GND

Ground

33

CML-I

Tx3p

Transmitter Non-Inverted Data Input

34

CML-I

Tx3n

Transmitter Inverted Data Input

35

GND

Ground

36

CML-I

Tx1p

Transmitter Non-Inverted Data Input

37

CML-I

Tx1n

Transmitter Inverted Data Input

38

GND

Ground

39

GND

Ground

40

CML-I

Tx6n

Transmitter Inverted Data Input

41

CML-I

Tx6p

Transmitter Non-Inverted Data Input

42

GND

Ground

43

CML-I

Tx8n

Transmitter Inverted Data Input

44

CML-I

Tx8p

Transmitter Non-Inverted Data Input

45

GND

Ground

46

Reserved

47

VS1

48

VccRx1

+3.3V Power supply

49

VS2

50

VS3

51

GND

Ground

52

CML-O

Rx7p

Receiver Non-Inverted Data Output

53

CML-O

Rx7n

Receiver Inverted Data Output

54

GND

Ground

55

CML-O

Rx5p

Receiver Non-Inverted Data Output

56

CML-O

Rx5n

Receiver Inverted Data Output

57

GND

Ground

58

GND

Ground

59

CML-O

Rx6n

Receiver Inverted Data Output

60

CML-O

Rx6p

Receiver Non-Inverted Data Output

61

GND

Ground

62

CML-O

Rx8n

Receiver Inverted Data Output

63

CML-O

Rx8p

Receiver Non-Inverted Data Output

64

GND

Ground

65

NC

66

Reserved

67

VccTx1

+3.3V Power supply

68

VCC2

+3.3V Power supply

69

Reserved

70

GND

Ground

71

CML-I

Tx7p

Transmitter Non-Inverted Data Input

72

CML-I

Tx7n

Transmitter Inverted Data Input

73

GND

Ground

74

CML-I

Tx5p

Transmitter Non-Inverted Data Input

75

CML-I

Tx5n

Transmitter Inverted Data Input

76

GND

Ground

Pin

Logic

Symbol

Description

1

GND

Ground

2

CML-I

Tx2n

Transmitter Inverted Data Input

3

CML-I

Tx2p

Transmitter Non-Inverted Data Input

4

GND

Ground

5

CML-I

Tx4n

Transmitter Inverted Data Input

6

CML-I

Tx4p

Transmitter Non-Inverted Data Input

7

GND

Ground

8

LVTTL-I

ModSelL

Module Select

9

LVTTL-I

ResetL

Module Reset

10

Vcc Rx

+3.3V Power Supply Receiver

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

17

CML-O

Rx1p

Receiver Non-Inverted Data Output

18

CML-O

Rx1n

Receiver Inverted Data Output

19

GND

Ground

20

GND

Ground

21

CML-O

Rx2n

Receiver Inverted Data Output

22

CML-O

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

24

CML-O

Rx4n

Receiver Inverted Data Output

25

CML-O

Rx4p

Receiver Non-Inverted Data Output

26

GND

Ground

27

LVTTL-O

ModPrsL

Module Present

28

LVTTL-O

IntL

Interrupt

29

Vcc Tx

+3.3V Power supply transmitter

30

Vcc1

+3.3V Power supply

31

LVTTL-I

LPMode

Low Power Mode

32

GND

Ground

33

CML-I

Tx3p

Transmitter Non-Inverted Data Input

34

CML-I

Tx3n

Transmitter Inverted Data Input

35

GND

Ground

36

CML-I

Tx1p

Transmitter Non-Inverted Data Input

37

CML-I

Tx1n

Transmitter Inverted Data Input

38

GND

Ground

QSFP-DD-2xQSFP28 DAC Specifications

Number of Lanes

Tx8 &Rx8(QSFP-DD)

Tx4 &Rx4(QSFP28)

Channel Data Rate

25.78125Gbps

Operating Temperature

0 to + 70°C

Storage Temperature

-40 to + 85°C

Supply Voltage

3.3 V nominal

Electrical Interface

76pins edge connector(QSFP-DD)

38pins edge connector(QSFP28)

Management Interface

Serial, I2C

Parameter

Symbol

Min

Typical

Max

Unit

Note

Differential Impedance

TDR

90

100

110

Ώ

Insertion loss

SDD21

-22.48

dB

At 12.89GHz

Differential Return Loss

SDD11

SDD22

See 1

dB

At 0.05 to 4.1 GHz

See 2

dB

At 4.1 to 19 GHz

Common-mode to common-mode output return loss

SCC11

SCC22

-2

dB

At 0.2 to 19 GHz

Differential to common-mode

return loss

SCD11

SCD22

See 3

dB

At 0.01 to 12.89 GHz

See 4

At 12.89 to 19 GHz

Differential to common Mode

Conversion Loss

SCD21-IL

-10

dB

At 0.01 to 12.89 GHz

See 5

At 12.89 to 15.7 GHz

-6.3

At 15.7 to 19 GHz

Notes:

1. Reflection Coefficient given by equation SDD11(dB) < -16.5 + 2 × SQRT(f ), with f in GHz

2. Reflection Coefficient given by equation SDD11(dB) < -10.66 + 14 × log10(f/5.5), with f in GHz

3. Reflection Coefficient given by equation SCD11(dB) < -22 + (20/25.78)*f, with f in GHz

4. Reflection Coefficient given by equation SCD11(dB) < -15 + (6/25.78)*f, with f in GHz

5. Reflection Coefficient given by equation SCD21(dB) < -27 + (29/22)*f, with f in GHz

Length (m)

Cable AWG

1

     30

2

    30

3

    30

5

    26

Feature

Test Method

Performance

Electrostatic Discharge (ESD) to the Electrical Pins

MIL-STD-883C Method 3015.7

Class 1(>2000 Volts)

Electromagnetic Interference(EMI)

FCC Class B

Compliant with Standards

CENELEC EN55022 Class B

CISPR22 ITE Class B

RF Immunity(RFI)

IEC61000-4-3

Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz

RoHS Compliance

RoHS Directive 2011/65/EU and it's Amendment Directives （EU） 2015/863

RoHS （EU）2015/863 compliant

REACH Compliance

REACH  Regulation (EC) No 1907/2006

REACH (EC) No 1907/2006 compliant