Texas Instruments SN7400N Quad 2-Input Positive-NAND Gates These devices contain four independent 2-input-NAND gates. The devices perform the Boolean function Y = A • B or Y = A + B in positive logic. Datasheet – Product page Manufactured: 1974 week 32 SN7400N (1), manufactured 1974 week 32 SN7400N (2), manufactured 1990 week 13 Download PDF