MM54HC283/MM74HC283
4-Bit Binary Adder with Fast Carry
General Description
This full adder performs the addition of two 4-bit binary numbers
utilizing advanced silicon-gate CMOS technology. The
sum (R) outputs are provided for each bit and the resultant
carry (C4) is obtained from the fourth bit. These adders feature
full internal look ahead across all four bits. This provides
the system designer with partial look-ahead performance
at the economy and reduced package count of a ripple-
carry implementation.
The adder logic, including the carry, is implemented in its
true form meaning that the end-around carry can be accomplished
without the need for logic or level inversion. All inputs
are protected from damage due to static discharge by
internal diode clamps to VCC and ground.
Features
Y Full-carry look-ahead across the four bits
Y Systems achieve partial look-ahead performance
with the economy of ripple carry
Y Wide supply range: 2V to 6V
Y Low quiescent power consumption: 8 mA at 25§C
Y Low input current: 1 mA maximum