NXP 74HC283D,652 芯片, 逻辑, 二进制全加法器, 4位, SOIC-16
The 74HC283D is a 4-bit Binary Full Adder with fast carry. This high-speed Si-gate CMOS device is pin compatible with low power Schottky TTL LSTTL. The 74HC283 is specified in compliance with JEDEC standard no. 7A. It adds two 4-bit binary words An plus Bn plus the incoming carry CIN. The binary sum appears on the sum outputs S1 to S4 and the out-going carry COUT. Due to the symmetry of the binary add function, the 74HC283 can be used with either all active high operands positive logic or all active low operands negative logic. In case of all active low operands the results S1 to S4 and COUT should be interpreted also as active low. With active high inputs, CIN must be held low when no carry in is intended. Interchanging inputs of equal weight does not affect the operation, thus CIN, A1, B1 can be assigned arbitrarily to pins 5, 6, 7, etc.