© 1999 Fairchild Semiconductor Corporation DS009513 www.fairchildsemi.com
April 1988
Revised August 1999
7
4F283 4-Bi
t Binar
y
Ful
l Adder wit
h

F
ast Carr
y
74F283
4-Bit Binary Full Adder with Fast Carry
General Description
The 74F283 high-speed 4-bit binary full adder with internal
carry lookahead accepts two 4-bit binary words (A
0
–A
3
,
B
0
–B
3
) and a Carry input (C
0
). It generates the binary Sum
outputs (S
0
–S
3
) and the Carry output (C
4
) from the most
significant bit. The 74F283 will operate with either active
HIGH or active LOW operands (positive or negative logic).

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Unit Loading/Fan Out
Order Number Package Number Package Description
74F283SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74F283SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F283PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names Description
U.L. Input I
IH
/I
IL
HIGH/LOW Output I
OH
/I
OL
A
0
–A
3
A Operand Inputs 1.0/2.0 20 µA/−1.2 mA
B
0
–B
3
B Operand Inputs 1.0/2.0 20 µA/−1.2 mA
C
0
Carry Input 1.0/1.0 20 µA/−0.6 mA
S
0
–S
3
Sum Outputs 50/33.3 −1 mA/20 mA
C
4
Carry Output 50/33.3 −1 mA/20 mA