Ttls

SN54/74LS283 4-BIT BINARY FULL ADDER WITH FAST CARRY
The SN54 / 74LS283 is a high-speed 4-Bit Binary Full Adder with internal carry lookahead. It accepts two 4-bit binary words (A1 – A4, B1 – B4) and a Carry Input (C0). It generates the binary Sum outputs (∑1 – ∑4) and the Carry Output (C4) from the most significant bit. The LS283 operates with either active HIGH or active LOW operands (positiveor negative logic).

4-BIT BINARY FULL ADDER WITH FAST CARRY
LOW POWER SCHOTTKY

CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 B3 15 A3 14 Σ3 13 A4 12 B4 11 Σ4 10 C4 9
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1

J SUFFIX CERAMIC CASE 620-09

1 Σ2

2 B2

3 A2

4 Σ1

5 A1

6 B1

7 C0

8 GND

16 1

N SUFFIX PLASTICCASE 648-08

PIN NAMES

LOADING (Note a) HIGH LOW 0.5 U.L. 0.5 U.L. 0.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L.

16 1

D SUFFIX SOIC CASE 751B-03

A1 – A4 B1–B4 C0 ∑1 – ∑4 C4

Operand A Inputs Operand B Inputs Carry Input Sum Outputs (Note b) Carry Output (Note b)

1.0 U.L. 1.0 U.L. 0.5 U.L. 10 U.L. 10 U.L.

ORDERING INFORMATION
SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOICNOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.

LOGIC SYMBOL
5 3 14 12 6 2 15 11

A1 A2 A3 A4 B1 B2 B3 B4 7 C0 ∑1 ∑2 ∑3 ∑4 4 1 13 10 C4 9

VCC = PIN 16 GND = PIN 8

FAST AND LS TTL DATA 5-1

SN54/74LS283
LOGIC DIAGRAM
C0
7

A1
5

B1
6

A2
3

B2
2

A314

B3
15

A4
12

B4
11

C1

C2

C3

4 ∑1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS ∑2

1 ∑3

13 ∑4

10

9

C4

FUNCTIONAL DESCRIPTION The LS283 adds two 4-bit binary words (A plus B) plus the incoming carry. The binary sum appears on the sum outputs (∑1 – ∑4) and outgoing carry (C4) outputs. C0 + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = ∑1 + 2 ∑2 + 4 ∑3 + 8 ∑4 +16C4 Where: (+) = plus Example:
C0 logic levels Active HIGH Active LOW L 0 1 A1 L 0 1 A2 H 1 0 A3 L 0 1 A4 H 1 0 B1 H 1 0 B2 L 0 1

Due to the symmetry of the binary add function the LS283 can be used with either all inputs and outputs active HIGH (positive logic) or with all inputs and outputs active LOW (negative logic). Note that with active HIGH inputs, Carry Input can not be left open,but must be held LOW when no carry in is intended.

B3 L 0 1

B4 H 1 0

∑1 H 1 0

∑2 H 1 0

∑3 L 0 1

∑4 L 0 1

C4 H 1 0 (10+9=19) (carry+5+6=12)

Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3.

FAST AND LS TTL DATA 5-2

SN54/74LS283
FUNCTIONAL TRUTH TABLE
C (n – 1) L L L L H H H H An L L H HL L H H Bn L H L H L H L H ∑n L H H L H L L H Cn L L L H L H H H

C1 – C3 are generated internally C0 is an external input C4 is an output generated internally

GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current — High Output Current — Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 – 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 12570 – 0.4 4.0 8.0 Unit V °C mA mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol S b l VIH VIL VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 C0 Any A or B IIH Input HIGH C I Current C0 Any A or B IIL IOS ICC Input LOW Current C0 Any A or B ShortCircuit Current (Note 1) Power Supply Current Total, Output HIGH Total, Output LOW – 20 0.1 0.2 – 0.4 – 0.8 – 100 34 39 0.35 0.5 20 40 V µA µA mA mA mA mA mA VCC = MAX VIN = 0 4 V MAX, 0.4 VCC = MAX VCC = MAX VCC = MAX VIN = 7 0 V MAX, 7.0 2.7 3.5 0.25 0.4 V V 2.5 – 0.65 3.5 0.8 – 1.5 V V Min 2.0 0.7 V Typ Max Unit U i V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs...