CD74HCT283 - High Speed CMOS Logic 4-Bit Binary Full Adder with Fast Carry

The ’HC283 and ’HCT283 binary full adders add two 4-bit binary numbers and generate a carry-out bit if the sum exceeds 15.

Because of the symmetry of the add function, this device can be used with either all active-high operands (positive logic) or with all active-low operands (negative logic). When using positive logic the carry-in input must be tied low if there is no carry-in.

• Adds Two Binary Numbers
• Full Internal Lookahead
• Fast Ripple Carry for Economical Expansion
• Operates with Both Positive and Negative Logic
• Fanout (Over Temperature Range)
  - Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
  - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55°C to 125°C
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
  - 2V to 6V Operation
  - High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
• HCT Types
  - 4.5V to 5.5V Operation
  - Direct LSTTL Input Logic Compatibility, V_IL = 0.8V (Max), V_IH = 2V (Min)
  - CMOS Input Compatibility, I_l 1µA at V_OL, V_OH