These devices contain two independent 4-input NAND gates.
The SN5420, SN54LS20, and SN54S20 are characterized for operation over the full military range of -55oC to 125oC. The SN7420, SN74LS20, and SN74S20 are characterized for operation from 0oC to 70oC.
www.ti.com/lit/gpn/sn74ls20
The SN5420, SN54LS20, and SN54S20 are characterized for operation over the full military range of -55oC to 125oC. The SN7420, SN74LS20, and SN74S20 are characterized for operation from 0oC to 70oC.
www.ti.com/lit/gpn/sn74ls20