7400

The 7400 (variants 74LS00, 74HC00) is a 74-series logic IC with four independent 2-Input NAND gates.

7400 Pinout

      .--\/--.
 1Y --|01  14|-- +5V
 1A --|02  13|-- 4Y
 1B --|03  12|-- 4B
 2Y --|04  11|-- 4A
 2A --|05  10|-- 3Y
 2B --|06  09|-- 3B
Gnd --|07  08|-- 3A
      `------'

Signal descriptions

Y is low if A and B are both high, and is high if either A or B is low.