74LS20.pdf 54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates June 1989 54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates General Description Features This device contains two independent gates each of which Y Alternate Military Aerospace device (54LS20) is avail- performs the logic NAND function able Contact a National Semiconductor Sales Office ……