1 Features
• Buffered inputs
• Exceeds 2kV ESD protection MIL-STD-883,
method 3015
• SCR-latchup-resistant CMOS process and circuit
design
• Speed of bipolar FAST™/AS/S with significantly
reduced power consumption
• Balanced propagation delays
• AC types feature 1.5V to 5.5V operation and
balanced noise immunity at 30% of the supply
• ±24mA output drive current
– Fanout to 15 FAST™ ICs
– Drives 50Ω transmission lines

2 Description
The ’AC283 and ’ACT283 4-bit binary adders with fast
carry that utilize Advanced CMOS Logic technology.
These devices add two 4-bit binary numbers and
generate a carryout 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.