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National Semiconductor Electronic Components Datasheet


74283

4-Bit Binary Adders with Fast Carry



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74283 pdf
June 1989
54LS283 DM54LS283 DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary
numbers 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 accom-
plished without the need for logic or level inversion
Features
Y Full-carry look-ahead across the four bits
Y Systems achieve partial look-ahead performance with
the economy of ripple carry
Y Typical add times
Two 8-bit words 25 ns
Two 16-bit words 45 ns
Y Typical power dissipation per 4-bit adder 95 mW
Y Alternate Military Aerospace device (54LS283) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6421 – 1
Order Number 54LS283DMQB 54LS283FMQB 54LS283LMQB
DM54LS283J DM54LS283W DM74LS283M or DM74LS283N
See NS Package Number E20A J16A M16A N16E or W16A
C1995 National Semiconductor Corporation TL F 6421
RRD-B30M105 Printed in U S A



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74283 pdf
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54LS283
Nom
Max
5 55
07
b0 4
4
125
Min
4 75
2
0
DM74LS283
Nom
Max
5 5 25
08
b0 4
8
70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
High Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
DM54
DM74
25
27
VOL
Low Level Output
VCC e Min IOL e Max
DM54
Voltage
VIL e Max VIH e Min
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max
Input Voltage
VI e 7V
AB
C0
IIH
High Level Input
VCC e Max
Current
VI e 2 7V
AB
C0
IIL
Low Level Input
VCC e Max
Current
VI e 0 4V
AB
C0
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b20
ICC1
Supply Current
VCC e Max (Note 3)
ICC2
Supply Current
VCC e Max (Note 4)
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3 ICC1 is measured with all outputs open all B inputs low and all other inputs at 4 5V or all inputs at 4 5V
Note 4 ICC2 is measured with all outputs open and all inputs grounded
Typ
(Note 1)
34
34
0 25
0 35
0 25
19
22
Max
b1 5
04
05
04
02
01
40
20
b0 8
b0 4
b100
b100
34
39
Units
V
V
V
mA
mA
mA
mA
mA
mA
2



Part Number 74283
Description 4-Bit Binary Adders with Fast Carry
Maker National Semiconductor - National Semiconductor
Total Page 8 Pages
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