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.