Datasheet

Datasheet Transceiver
Pin Descriptions
Pin Logic Symbol Description Notes
1 GND Ground 1
2 CML-I Tx2n Transmitter Inverted Data Input
3 CML-I Tx2p Transmitter Non-Inverted Data Input
4 GND Ground 1
5 CML-I Tx4n Transmitter Inverted Data Input
6 CML-I Tx4p Transmitter Non-Inverted Data Input
7 GND Ground 1
8LVTTL-I ModSelL Module Select
9LVTTL-I ResetL Module Reset
10 VccRx +3.3 V 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
25 CML-O Rx4p Receiver Non-Inverted Data Output
26 GND Ground 1
27 LVTTL-O ModPrsL Module Present
28 LVTTL-O IntL/RxLOSL
Interrupt. Optionally Configurable As RxLOSL Via The
Management Interface (SFF-8636).
29 VccTx +3.3 V Power supply transmitter 2
30 Vcc1 +3.3 V Power suppl
y2
31 LVTTL-I LPMode/TxDis
Low Power Mode. Optionally Configurable As TxDis Via The
Management Interface (SFF-8636).
32 GND Ground 1
33 CML-I Tx3p Transmitter Non-Inverted Data Input
34 CML-I Tx3n Transmitter Inverted Data Input
35 GND Ground 1
36 CML-I Tx1p Transmitter Non-Inverted Data Input
37 CML-I Tx1n Transmitter Inverted Data Input
38 GND Ground 1
*Note 1: GND is the symbol for signal and supply (power) common for QSFP28 modules. All are common within the QSFP28 module and all module
voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.
*Note 2: VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. Vcc Rx, Vcc1 and Vcc Tx may be
internally connected within the QSFP28 transceiver module in any combination.