54act283 National Semiconductor Corporation, 54act283 Datasheet

54act283

Manufacturer Part Number

54act283

Description

4-bit Binary Full Adder With Fast Carry

Manufacturer

National Semiconductor Corporation

Datasheet

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54ACT283

4-Bit Binary Full Adder with Fast Carry

General Description

The ’ACT283 high-speed 4-bit binary full adder with internal

carry lookahead accepts two 4-bit binary words (A

outputs (S

nificant bit. The ’ACT283 will operate with either active HIGH

or active LOW operands (positive or negative logic).

Logic Symbols

Connection Diagrams

–B

) and a Carry input (C

–S

) and the Carry output (C

for DIP and Flatpak

Pin Assignment

IEEE/IEC

). It generates the binary Sum

DS100977-2

DS100977-4

DS100977

) from the most sig-

DS100977-1

–A

Features

n Guaranteed 4000V minimum ESD protection

n Outputs source/sink 24 mA

n TTL-compatible inputs

n Available to Mil-Std-883

Functional Description

The ’ACT283 adds two 4-bit binary words (A plus B) plus the

incoming Carry (C

of the various inputs and outputs is indicated by the subscript

numbers, representing powers of two.

Interchanging inputs of equal weight does not affect the op-

eration. Thus C

6 and 7 for DIPS, and 7, 8 and 9 for chip carrier packages.

Due to the symmetry of the binary add function, the ’ACT283

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 C

must be tied LOW for active HIGH logic or tied HIGH for ac-

tive LOW logic.

Due to pin limitations, the intermediate carries of the

’ACT283 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 oper-

and inputs of the fourth adder (A

pendent only on, and equal to, the carry from the third adder.

Using somewhat the same principle, Figure 3 shows a way

of dividing the ’ACT283 into a 2-bit and a 1-bit adder. The

third stage adder (A

getting a carry (C

) and bringing out the carry from the second stage on S

–S

) and outgoing carry (C

= S

+ 2

, A

Pin Assignment for LCC

+ 2S

) signal into the fourth stage (via A

). The binary sum appears on the Sum

, B

+ B

, B

Where (+) = plus

can be arbitrarily assigned to pins 5,

+ B

, S

+ C

+ 4S

) is used merely as a means of

) + 2

) outputs. The binary weight

+ 8S

, B

DS100977-3

) LOW makes S

+ 16C

+ B

September 1998

)

www.national.com

is not used it

and

de-

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54act283 Summary of contents

Page 1

... Binary Full Adder with Fast Carry General Description The ’ACT283 high-speed 4-bit binary full adder with internal carry lookahead accepts two 4-bit binary words (A B –B ) and a Carry input ( generates the binary Sum outputs (S –S ) and the Carry output (C ...

Page 2

Functional Description Note that as long as A and B are the same, whether HIGH LOW, they do not influence S . Similarly, when A 2 are the same the carry into the third stage does not ...

Page 3

Logic Diagram 3 www.national.com ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias V Pin Potential to CC Ground Pin Input Voltage ...

Page 5

AC Electrical Characteristics for ’ACT Family Devices Symbol Parameter t Propagation Delay PLH PHL Propagation Delay PLH PHL Propagation Delay PLH t C ...

Page 6

6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier (L) 16-Lead Ceramic Dual-In-Line Package (D) Package Number E20A Package Number J16A 7 www.national.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR ...

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