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54LS40 series datasheets. Manufacturer: National Semiconductor.

54LS40DMQB7 V, dual 4-input NAND buffer in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
54LS40FMQB7 V, dual 4-input NAND buffer in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
54LS40LMQB7 V, dual 4-input NAND buffer in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
DM74LS40M7 V, dual 4-input NAND buffer in 14-pin DIL package. Operational temperature range from 0°C to 70°C.Datasheet*)
DM74LS40N7 V, dual 4-input NAND buffer in 14-pin DIL package. Operational temperature range from 0°C to 70°C.Datasheet*)
There are other manufacturers for this components. For more information please check
54LS40 (Motorola)
Click here to download 54LS40 Datasheet
Click here to download Datasheet
*)

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