74LS Series
- Texas Instruments SN74LS21N, This is the Texas Instruments SN74LS21N dual 4 input positive & gate IC from the 74LS family. This is part of a range of low power Schottky devices offering the same speed as standard TTL but at a fifth of the power consumption. Texas Instruments SN74LS21N Dual 4 Input Positive & Gates DIP14