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54LS21 series datasheets. Manufacturer: National Semiconductor.

54LS21DMQB7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
54LS21FMQB7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
54LS21LMQB7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
DM54LS21J7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
DM54LS21W7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from -55°C to 125°C.Datasheet*)
DM74LS21M7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from 0°C to 70°C.Datasheet*)
DM74LS21N7 V, dual 4-input AND gate in 14-pin DIL package. Operational temperature range from 0°C to 70°C.Datasheet*)
54LS21Dual 4-Input AND GatesDatasheet*)
DM54LS21Dual 4-Input AND GatesDatasheet*)
DM74LS21Dual 4-Input AND GatesDatasheet*)
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