高速CMOS逻辑4位二进制全加器与快速进 High-Speed CMOS Logic 4-Bit Binary Full Adder with Fast Carry
Description
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.
Features
• 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℃ to 125℃
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL= 30%, NIH= 30% of VCC at VCC= 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL= 0.8V Max, VIH = 2V Min
- CMOS Input Compatibility, Il ≤1µA at VOL, VOH
