NSC DM54LS283J-MLS Datasheet

TL/F/6421

54LS283/DM54LS283/DM74LS283 4-Bit Binary Adders with Fast Carry

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 look­ahead 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.

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 avail­able. 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

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

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

b

55§Ctoa125§C

DM74LS 0

§

Ctoa70§C

Storage Temperature Range

b

65§Ctoa150§C

Note:

The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran­teed. 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 Parameter

DM54LS283 DM74LS283

Units

Min Nom Max Min Nom Max

V

CC

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

V

IH

High Level Input Voltage 2 2 V

V

IL

Low Level Input Voltage 0.7 0.8 V

I

OH

High Level Output Current

b

0.4

b

0.4 mA

I

OL

Low Level Output Current 4 8 mA

T

A

Free Air Operating Temperature

b

55 125 0 70

§

C

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Typ

Max Units

(Note 1)

V

I

Input Clamp Voltage V

CC

e

Min, I

I

eb

18 mA

b

1.5 V

V

OH

High Level Output V

CC

e

Min, I

OH

e

Max DM54 2.5 3.4

V

Voltage V

IL

e

Max, V

IH

e

Min

DM74 2.7 3.4

V

OL

Low Level Output V

CC

e

Min, I

OL

e

Max DM54 0.25 0.4

Voltage V

IL

e

Max, V

IH

e

Min

DM74 0.35 0.5 V

I

OL

e

4 mA, V

CC

e

Min DM74 0.25 0.4

I

I

Input Current@Max V

CC

e

Max A, B 0.2

mA

Input Voltage V

I

e

7V

C0 0.1

I

IH

High Level Input V

CC

e

Max A, B 40

mA

Current V

I

e

2.7V
C0 20

I

IL

Low Level Input V

CC

e

Max A, B

b

0.8
mA

Current V

I

e

0.4V
C0

b

0.4

I

OS

Short Circuit V

CC

e

Max DM54

b

20

b

100

mA

Output Current (Note 2)

DM74

b

20

b

100

I

CC1

Supply Current V

CC

e

Max (Note 3) 19 34 mA

I

CC2

Supply Current V

CC

e

Max (Note 4) 22 39 mA

Note 1: All typicals are at V

CC

e

5V, T

A

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: I

CC1

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: I

CC2

is measured with all outputs open and all inputs grounded.

2

Switching Characteristics at V

CC

e

5V and T

A

e

25§C (See Section 1 for Test Waveforms and Output Load)

From (Input)

R

L

e

2kX

Symbol Parameter

To (Output)

C

L

e

15 pF C

L

e

50 pF Units

Min Max Min Max

t

PLH

Propagation Delay Time C0 to

24 28 ns

Low to High Level Output R1, R2

t

PHL

Propagation Delay Time C0 to

24 30 ns

High to Low Level Output R1, R2

t

PLH

Propagation Delay Time C0 to

24 28 ns

Low to High Level Output R3

t

PHL

Propagation Delay Time C0 to

24 30 ns

High to Low Level Output R3

t

PLH

Propagation Delay Time C0 to

24 28 ns

Low to High Level Output R4

t

PHL

Propagation Delay Time C0 to

24 30 ns

High to Low Level Output R4

t

PLH

Propagation Delay Time Aior B

i

24 28 ns

Low to High Level Output to R

i

t

PHL

Propagation Delay Time Aior B

i

24 30 ns

High to Low Level Output to R

i

t

PLH

Propagation Delay Time C0 to

17 24 ns

Low to High Level Output C4

t

PHL

Propagation Delay Time C0 to

17 25 ns

High to Low Level Output C4

t

PLH

Propagation Delay Time Aior B

i

17 24 ns

Low to High Level Output to C4

t

PHL

Propagation Delay Time Aior B

i

17 26 ns

High to Low Level Output to C4

Function Table

TL/F/6421– 3

HeHigh Level, LeLow Level

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 R 3, R 4, and C4.

3