SN74LS26
High-Voltage Interface Positive-NAND Gates (Texas Instruments)
SN74LS26
QUAD 2-INPUT NAND BUFFER (Motorola)
SN74LS260
DUAL 5-INPUT NOR GATE (Motorola)
SN74LS266
QUAD 2-INPUT EXCLUSIVE NOR GATE (Motorola)
SN74LS266
QUADRUPLE 2-INPUT EXCLUSIVE-NOR GATES (Texas Instruments)
SN74LS20
DUAL 4-INPUT NAND GATE (Motorola)
SN74LS20
Dual 4-Input Positive-NAND Gate (Texas Instruments)
SN74LS20N
DUAL 4-INPUT NAND GATE (Motorola)
SN74LS21
DUAL 4-INPUT AND GATE (Motorola)
SN74LS21
DUAL 4-INPUT POSITIVE-AND GATE (Texas Instruments)