XFP – Pin Assignment and Pin Description

Host PCB XFP Pinout

Image: Host PCB XFP Pinout

XFP Transceiver Electrical Pad Layout

Image: XFP Transceiver Electrical Pad Layout

 

Pin# Name Logic Description Note
1 GND Module Ground 1
2 VEE5 -5.2V Power Supply , not in use 3
3 MOD_DESEL LVTTL-I Module De-select; When held Low allows module to respond to 2-wire serial interface
4 INTERRUPTb LVTTL-O Indicates presence of an important condition, which can be read over the 2-wire serial interface. This pin is an open collector output and must be pulled up to host_Vcc on the host board. 2
5 TX_DIS LVTTL-I Transmitter Disable; When asserted High, transmitter output is turned off. This pin is pulled up to VCC3 in the module
6 VCC5 +5V Power Supply, not in use 3
7 GND Module Ground 1
8 VCC3 +3.3V Power Supply
9 VCC3 +3.3V Power Supply
10 SCL I/O 2-wire serial interface clock. Host shall use a pull-up resistor connected to host_Vcc of +3.3V. 2
11 SDA I/O 2-wire serial interface data. Host shall use a pull-up resistor connected to host_Vcc of +3.3V. 2
12 MOD_ABS LVTTL-O Indicates Module is not present. Host shall pull up this pin, and grounded in the module. “High” when the XFP module is absent from a host board. 2
13 MOD_NR LVTTL-O Module not ready; When High, Indicates Module Operational Fault. This pin is an open collector and must be pulled to host_Vcc on the host board. 2,4,5
14 RX_LOS LVTTL-O Receiver Loss of Signal; When high, indicates insufficient optical input power to the module. This pin is an open collector and must be pulled to host_Vcc on the host board. 2
15 GND Module Ground
16 GND Module Ground
17 RDN CML-O Receiver Inverted Data Output; AC coupled inside the module.
18 RDP CML-O Receiver Non-Inverted Data Output; AC coupled in side the module.
19 GND Module Ground 1
20 VCC2 + 1.8V Power Supply; not in use 3
21 P_DOWN/RST LVTTL-I Power down; When High, module is limited power mode. Low for normal operation.

Reset; The falling edge indicates complete reset of the module. This pin is pulled up to VCC3 in the module.
22 VCC2 + 1.8V Power Supply; not in use 3
23 GND Module Ground 1
24 REFCLKP PECL-I Reference clock Non-Inverted Input; not in use
25 REFCLKN PECL-I Reference clock Inverted Input; not in use
26 GND Module Ground 1
27 GND Module Ground 1
28 TDN CML-I Transmitter Inverted Data Input; AC coupled in side the module.
29 TDP CML-I Transmitter Non-Inverted Data Input; AC coupled in side the module.
30 GND Module Ground 1

Note :

1: Module ground pins are isolated from the module case and chassis ground within the module.
2: Shall be pulled up with 4.7k to 10k ohm to a voltage between 3.15V and 3.45V on the host board.
3: Not connected internally.
4: Response time: typ. 20msec ( XFP MSA Rev. 4.5 = 1msec)
5: MOD_NR = (TX LOL) OR (RX LOL ).

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