The requested file:
https://pdf.datasheetcatalog.com/datasheets/400/331354_DS.pdf
is the data sheet for the following electronic components:

Texas Instruments

#	Part Name	Description
1	74LS157	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
2	SN54157W	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
3	SN54LS157FK	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
4	SN54LS157W	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
5	SN54LS158W	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
6	SN54S157FK	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
7	SN54S157W	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
8	SN54S158	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
9	SN54S158FK	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
10	SN54S158J	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
11	SN54S158W	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
12	SN74157	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
13	SN74157N	QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

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