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The SN74LS279 is a Quad 2-Input Positive-NAND Gates from Texas Instruments. It is a 14-pin dual in-line package (DIP) integrated circuit (IC). Description: The SN74LS279 is a quad 2-input positive-NAND gate. It has four independent gates each of which performs the logic NAND function. The inputs of each gate are A and B and the output is Y. Features: High-Speed Operation: tpd = 10 ns (typ) at VCC = 5 V Low Power Consumption: ICC = 4 μA (max) at TA = 25°C High Noise Immunity: VNIH = VNIL = 28% VCC (min) Balanced Propagation Delay Times: tPLH tPHL Fanout of 2 LSTTL Loads Inputs Compatible With TTL Voltage Levels Outputs Directly Interface With CMOS, NMOS, and TTL Applications: The SN74LS279 is used in applications such as logic gates, data selectors, multiplexers, and memory address decoding. It is also used in digital systems such as computers, calculators, and other digital circuits. (For reference only)