The requested file:
https://pdf.datasheetcatalog.com/datasheet_pdf/national-semiconductor/DM54S188AJ_to_DM74S188V.pdf
is the data sheet for the following electronic components:

National Semiconductor

#	Part Name	Description
1	DM54S188AJ	35 ns, (32 x 8) 256-bit TTL PROM
2	DM54S188J	45 ns, (32 x 8) 256-bit TTL PROM
3	DM74S188AJ	25 ns, (32 x 8) 256-bit TTL PROM
4	DM74S188AN	25 ns, (32 x 8) 256-bit TTL PROM
5	DM74S188AV	25 ns, (32 x 8) 256-bit TTL PROM
6	DM74S188J	35 ns, (32 x 8) 256-bit TTL PROM
7	DM74S188N	35 ns, (32 x 8) 256-bit TTL PROM
8	DM74S188V	35 ns, (32 x 8) 256-bit TTL PROM

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