AFBR-79EIZ Datasheet, PDF (11/19 Pages) –

QSFP+ Transceiver Pad Layout
38 GND
37 TX1n
36 TX1p
35 GND
34 TX3n
33 TX3p
32 GND
31 LPMode
30 Vcc1
29 VccTx
28 IntL
27 ModPrsL
26 GND
25 RX4p
24 RX4n
23 GND
22 RX2p
21 RX2n
20 GND
Top Side
Viewed from Top
Figure 7. QSFP+ Transceiver Pad Layout
GND
1
TX2n
2
TX2p
3
GND
4
TX4n
5
TX4p
6
GND
7
ModSelL
8
ResetL
9
VccRx
10
SCL
11
SDA
12
GND
13
RX3p
14
RX3n
15
GND
16
RX1p
17
RX1n
18
GND
19
Bottom Side
Viewed from Bottom
Pin Logic
1
Symbol
GND
Description
Ground
Plug Sequence Notes
1
1
2 CML-I
3 CML-I
Tx2n
Tx2p
Transmitter Inverted Data Input
3
Transmitter Non-Inverted Data Input
3
4
GND
Ground
1
1
5 CML-I
Tx4n
Transmitter Inverted Data Input
3
6 CML-I
Tx4p
Transmitter Non-Inverted Data Input
3
7
GND
Ground
1
1
8 LVTTL-I
ModSelL Module Select
3
9 LVTTL-I
ResetL
Module Reset
3
10
Vcc Rx
+3.3V Power supply receiver
2
2
11 LVCMOS-I/O SCL
2-wire serial interface clock
3
12 LVCMOS-I/O SDA
2-wire serial interface data
3
13
GND
Ground
1
1
14 CML-O
15 CML-O
Rx3p
Rx3n
Receiver Non-Inverted Data Output
3
Receiver Inverted Data Output
3
16
GND
Ground
1
1
17 CML-O
Rx1p
Receiver Non-Inverted Data Output
3
18 CML-O
Rx1n
Receiver Inverted Data Output
3
19
GND
Ground
1
1
20
GND
Ground
1
1
21 CML-O
Rx2n
Receiver Inverted Data Output
3
22 CML-O
Rx2p
Receiver Non-Inverted Data Output
3
23
GND
Ground
1
1
24 CML-O
25 CML-O
Rx4n
Rx4p
Receiver Inverted Data Output
3
Receiver Non-Inverted Data Output
3
26
27 LVTTL-O
GND
ModPrsL
Ground
Module Present
1
1
3
28 LVTTL-O
IntL
Interrupt
3
29
Vcc Tx
+3.3V Power supply transmitter
2
2
30
31 LVTTL-I
Vcc1
LPMode
+3.3V Power Supply
Low Power Mode
2
2
3
32
GND
Ground
1
1
33 CML-I
Tx3p
Transmitter Non-Inverted Data Input
3
34 CML-I
Tx3n
Transmitter Inverted Data Input
3
35
GND
Ground
1
1
36 CML-I
37 CML-I
Tx1p
Tx1n
Transmitter Non-Inverted Data Input
3
Transmitter Inverted Data Input
3
38
GND
Ground
1
1
Notes:
1. GND is the symbol for signal 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.
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