HD74LS293
4-bit Binary Counters (Hitachi Semiconductor)
HD74LS293P
4-bit Binary Counter (Renesas)
HD74LS298
Quadruple 2-input Multiplexers (Hitachi Semiconductor)
HD74LS299
8-bit Universal Shift/Storage Registers (Hitachi Semiconductor)
HD74LS20
Dual 4-input Positive NAND Gates (Hitachi Semiconductor)
HD74LS20
Dual 4-input Positive NAND Gates (Renesas)
HD74LS20P
Dual 4-input Positive NAND Gates (Renesas)
HD74LS21
Dual 4-input Positive AND Gates (Hitachi Semiconductor)
HD74LS21
Dual 4-input Positive AND Gates (Renesas)
HD74LS21P
Dual 4-input Positive AND Gates (Renesas)