The requested file:
https://pdf.datasheetcatalog.com/datasheet/sipex/SP3491EN.pdf
is the data sheet for the following electronic components:

Sipex Corporation

#	Part Name	Description
1	SP3490CN	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
2	SP3490CP	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
3	SP3490EN	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
4	SP3490EP	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
5	SP3491	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
6	SP3491CN	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
7	SP3491CP	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
8	SP3491EN	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
9	SP3491EN	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
10	SP3491EP	+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate

Select the part name and then you can download the datasheet in PDF format.