SFPwire® 25G DAC Product Specification

Finisar Transceiver



Coherent Corp. Dec. 2022 Rev A02 – Coherent Corp. Confidential

Page 2

I.

Pin Descriptions

SFP28 Pin Function Definition

Pin

Logic

Symbol

Name/Description

Notes

1

VeeT

Transmitter Ground

2

LV-TTL-O

TX_Fault

N/A

1

3

LV-TTL-I

TX_DIS

Transmitter Disable

2

4

LV-TTL-I/O

SDA

Tow Wire Serial Data

5

LV-TTL-I

SCL

Tow Wire Serial Clock

6

MOD_DEF0

Module present, connect to VeeT

7

LV-TTL-I

RS0

N/A

1

8

LV-TTL-O

LOS

LOS of Signal

2

9

LV-TTL-I

RS1

N/A

1

10

VeeR

Reciever Ground

11

VeeR

Reciever Ground

12

CML-O

RD-

Reciever Data Inverted

13

CML-O

RD+

Reciever Data Non-Inverted

14

VeeR

Reciever Ground

15

VccR

Reciever Supply 3.3V

16

VccT

Transmitter Supply 3.3V

17

VeeT

Transmitter Ground

18

CML-I

TD+

Transmitter Data Non-Inverted

19

CML_I

TD-

Transmitter Data Inverted

20

VeeT

Transmitter Ground

1. Signals not supported in SFP+ Copper pulled-downto VeeT with 30K ohms resistor

2. Passive cable assemblies do not support LOS and TX_DIS

Figure 1. Diagram of Host Board Connector Block Pin Numbers and Names