SN74LS28
QUAD 2-INPUT NOR BUFFER (Motorola)
SN74LS280
9-Bit Odd/Even Parity Generators/Checkers (ON Semiconductor)
SN74LS280
9-BIT ODD/EVEN PARITY GENERATORS/CHECKERS (Motorola)
SN74LS283
4-Bit Binary Full Adder (ON Semiconductor)
SN74LS283
4-BIT BINARY FULL ADDER (Motorola)
SN74LS283
4-Bit Binary Full Adders (Texas Instruments)
SN74LS283D
4-Bit Binary Full Adders (Texas Instruments)
SN74LS283N
4-Bit Binary Full Adders (Texas Instruments)
SN74LS20
DUAL 4-INPUT NAND GATE (Motorola)
SN74LS20
Dual 4-Input Positive-NAND Gate (Texas Instruments)