The requested file:
https://pdf.datasheetcatalog.com/datasheet_pdf/samsung-electronic/KM44C256B-10_to_KM44C256B-8.pdf
is the data sheet for the following electronic components:

Samsung Electronic

#	Part Name	Description
1	KM44C256B-10	100ns; V(cc/in/out): -1.0 to 7.0V; 600mW; 50mA; 256K x 4-bit CMOS dynamic RAM with fast page mode
2	KM44C256B-7	70ns; V(cc/in/out): -1.0 to 7.0V; 600mW; 50mA; 256K x 4-bit CMOS dynamic RAM with fast page mode
3	KM44C256B-8	80ns; V(cc/in/out): -1.0 to 7.0V; 600mW; 50mA; 256K x 4-bit CMOS dynamic RAM with fast page mode

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