The requested file:
https://pdf.datasheetcatalog.com/datasheets/400/337836_DS.pdf
is the data sheet for the following electronic components:

Texas Instruments

#	Part Name	Description
1	74LS155	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
2	74LS156	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
3	SN54155	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
4	SN54155J	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
5	SN54156	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
6	SN54156J	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
7	SN54156W	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
8	SN54LS155AFK	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
9	SN54LS155AW	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
10	SN54LS156FK	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
11	SN54LS156W	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
12	SN74155	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
13	SN74155N	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
14	SN74156	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
15	SN74156N	DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS

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