The requested file:
https://pdf.datasheetcatalog.com/datasheet/motorola/SN54LS156J.pdf
is the data sheet for the following electronic components:

Motorola

#	Part Name	Description
1	74LS155	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
2	SN54LS155	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
3	SN54LS155J	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
4	SN54LS156	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
5	SN54LS156J	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
6	SN74LS155D	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
7	SN74LS155N	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
8	SN74LS156	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
9	SN74LS156D	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
10	SN74LS156N	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER

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