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74F283 Datasheet

4-Bit Binary Full Adder with Fast Carry

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November 1994
54F 74F283
4-Bit Binary Full Adder with Fast Carry
General Description
The ’F283 high-speed 4-bit binary full adder with internal
carry lookahead accepts two 4-bit binary words (A0 – A3
B0 – B3) and a Carry input (C0) It generates the binary Sum
outputs (S0 – S3) and the Carry output (C4) from the most
significant bit The ’F283 will operate with either active
HIGH or active LOW operands (positive or negative logic)
Features
Y Guaranteed 4000V minimum ESD protection
Commercial
74F283PC
74F283SC (Note 1)
74F283SJ (Note 1)
Military
54F283DM (Note 2)
54F283FM (Note 2)
54F283LL (Note 2)
Package
Number
N16E
J16A
M16A
M16D
W16A
E20A
Package Description
16-Lead (0 300 Wide) Molded Dual-In-Line
16-Lead Ceramic Dual-In-Line
16-Lead (0 150 Wide) Molded Small Outline JEDEC
16-Lead (0 300 Wide) Molded Small Outline EIAJ
16-Lead Cerpack
20-Lead Ceramic Leadless Chip Carrier Type C
Note 1 Devices also available in 13 reel Use suffix e SCX and SJX
Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP SOIC and Flatpak
Pin Assignment
for LCC
TL F 9513–1
IEEE IEC
TL F 9513 – 2
TL F 9513 – 3
TL F 9513–4
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9513
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

74F283 Datasheet

4-Bit Binary Full Adder with Fast Carry

No Preview Available !

Unit Loading Fan Out
Pin Names
Description
A0 – A3
B0 – B3
C0
S0 – S3
C4
A Operand Inputs
B Operand Inputs
Carry Input
Sum Outputs
Carry Output
54F 74F
UL
HIGH LOW
10 20
10 20
10 10
50 33 3
50 33 3
Input IIH IIL
Output IOH IOL
20 mA b1 2 mA
20 mA b1 2 mA
20 mA b0 6 mA
b1 mA 20 mA
b1 mA 20 mA
Functional Description
The ’F283 adds two 4-bit binary words (A plus B) plus the
incoming Carry (C0) The binary sum appears on the Sum
(S0 – S3) and outgoing carry (C4) outputs The binary weight
of the various inputs and outputs is indicated by the sub-
script numbers representing powers of two
20 (A0 a B0 a C0) a 21 (A1 a B1)
a 22 (A2 a B2) a 23 (A3 a B3)
e S0 a 2S1 a 4S2 a 8S3 a 16C4
Where (a) e plus
Interchanging inputs of equal weight does not affect the op-
eration Thus C0 A0 B0 can be arbitrarily assigned to pins
5 6 and 7 for DIPS and 7 8 and 9 for chip carrier packages
Due to the symmetry of the binary add function the ’F283
can be used either with all inputs and outputs active HIGH
(positive logic) or with all inputs and outputs active LOW
(negative logic) See Figure 1 Note that if C0 is not used it
must be tied LOW for active HIGH logic or tied HIGH for
active LOW logic
Due to pin limitations the intermediate carries of the ’F283
are not brought out for use as inputs or outputs However
other means can be used to effectively insert a carry into or
bring a carry out from an intermediate stage Figure 2
shows how to make a 3-bit adder Tying the operand inputs
of the fourth adder (A3 B3) LOW makes S3 dependent only
on and equal to the carry from the third adder Using some-
what the same principle Figure 3 shows a way of dividing
the ’F283 into a 2-bit and a 1-bit adder The third stage
adder (A2 B2 S2) is used merely as a means of getting a
carry (C10) signal into the fourth stage (via A2 and B2) and
bringing out the carry from the second stage on S2 Note
that as long as A2 and B2 are the same whether HIGH or
LOW they do not influence S2 Similarly when A2 and B2
are the same the carry into the third stage does not influ-
ence the carry out of the third stage Figure 4 shows a meth-
od of implementing a 5-input encoder where the inputs are
equally weighted The outputs S0 S1 and S2 present a bina-
ry number equal to the number of inputs I1 – I5 that are true
Figure 5 shows one method of implementing a 5-input ma-
jority gate When three or more of the inputs I1 – I5 are true
the output M5 is true
C0 A0 A1 A2 A3 B0 B1 B2 B3 S0 S1 S2 S3 C4
Logic Levels L L H L H H L L H H H L L H
Active HIGH 0 0 1 0 1 1 0 0 1 1 1 0 0 1
Active LOW 1 1 0 1 0 0 1 1 0 0 0 1 1 0
Active HIGH 0 a 10 a 9 e 3 a 16 Active LOW 1 a 5 a 6 e 12 a 0
FIGURE 1 Active HIGH versus Active LOW Interpretation
2


Part Number 74F283
Description 4-Bit Binary Full Adder with Fast Carry
Maker National
Total Page 10 Pages
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ETCTI





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