dm74ls283 National Semiconductor Corporation, dm74ls283 Datasheet - Page 3

• Manufacturer Part Number: dm74ls283
• Description: 4-bit Binary Adders With Fast Carry
• Manufacturer: National Semiconductor Corporation

Switching Characteristics
Function Table
H
Note Input conditions at A1 B1 A2 B2 and C0 are used to determine outputs R1 and R2 and the value of the internal carry C2 The values at C2 A3 B3 A4 and
B4 are then used to determine outputs R3 R4 and C4
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
e
High Level L
e
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Low Level
Parameter
at V
CC
From (Input)
To (Output)
e
R1 R2
R1 R2
A
A
A
A
C0 to
C0 to
C0 to
C0 to
C0 to
C0 to
C0 to
C0 to
to C4
to C4
to R
to R
i
i
i
i
R3
R3
R4
R4
C4
C4
or B
or B
or B
or B
5V and T
i
i
i
i
i
i
A
3
e
25 C (See Section 1 for Test Waveforms and Output Load)
Min
C
L
e
15 pF
Max
24
24
24
24
24
24
24
24
17
17
17
17
R
L
e
2 kX
Min
C
L
e
50 pF
Max
28
30
28
30
28
30
28
30
24
25
24
26
TL F 6421 – 3
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns