The 74HCxx Series C-MOS Standard Logic IC Standard logic IC was originally used to create any logic circuit during times where LSI has a low concentration and no PLD. The minimum units of logic circuits are packed into a single circuit, such as NOT, AND, OR, FF and so on. Therefore, the electrical characteristics of the input and output are standardized to allow direct connection to the standard logic IC of the same series. Due to the difference between TTL and C-MOS, the input/output voltage and current specifications are different, the connection of each other is required. (Normally LSI is according to either specification. In addition, the speed and operating voltage may vary depending on the series. The 74HCxx series is a representative breed of C-MOS. Unlike TTL such as 74LSxx, the operating voltage is wide, so it can be used with both +5V and +3.3V systems. Specifications: Package DIP-14 Features: Quad 2 - Input NAND Operating Voltage: 2 - 6 V.