DM74LS283N

DM74LS283N Datasheet

DM74LS283 4-Bit Binary Adder with Fast Carry

Part	Datasheet
DM74LS283N	DM74LS283N (pdf)

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DM74LS283 4-Bit Binary Adder with Fast Carry DM74LS283 4-Bit Binary Adder with Fast Carry These full adders perform the addition of two 4-bit binary numbers. The sum 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. s Full-carry look-ahead across the four bits s Systems achieve partial look-ahead performance with the economy of ripple carry s Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns s Typical power dissipation per 4-bit adder 95 mW Ordering Code: Order Number Package Number Package Description DM74LS283M M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow DM74LS283N N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram 2000 Fairchild Semiconductor Corporation DS006421 DM74LS283 Function Table H = HIGH Level, L = LOW Level Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs and the value of the internal carry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs and C4. Logic Diagram DM74LS283 Absolute Maximum Ratings Note 1 Supply Voltage Input Voltage Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Note 1 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 tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions 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 Electrical Characteristics over recommended operating free air temperature range unless otherwise noted Parameter Conditions Input Clamp Voltage VCC = Min, II = −18 mA HIGH Level VCC = Min, IOH = Max Output Voltage VIL = Max, VIH = Min LOW Level VCC = Min, IOL = Max Output Voltage VIL = Max, VIH = Min IOL = 4 mA, VCC = Min Input Current Max VCC = Max Input Voltage VI = 7V HIGH Level VCC = Max Input Current VI = 2.7V

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DM74LS283 4-Bit Binary Adder with Fast Carry

DM74LS283 4-Bit Binary Adder with Fast Carry

These full adders perform the addition of two 4-bit binary numbers. The sum 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.
s Full-carry look-ahead across the four bits s Systems achieve partial look-ahead performance with
the economy of ripple carry s Typical add times

Two 8-bit words 25 ns Two 16-bit words 45 ns s Typical power dissipation per 4-bit adder 95 mW
Ordering Code:

Order Number Package Number

Package Description

DM74LS283M

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

DM74LS283N

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram
2000 Fairchild Semiconductor Corporation DS006421

DM74LS283

Function Table

H = HIGH Level, L = LOW Level Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs and the value of the internal carry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs and C4.

Logic Diagram

DM74LS283

Absolute Maximum Ratings Note 1

Supply Voltage

Input Voltage

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range
−65°C to +150°C

Note 1 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 tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Recommended Operating Conditions

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

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

Parameter

Conditions

Input Clamp Voltage

VCC = Min, II = −18 mA

HIGH Level

VCC = Min, IOH = Max

Output Voltage

VIL = Max, VIH = Min

LOW Level

VCC = Min, IOL = Max

Output Voltage

VIL = Max, VIH = Min

IOL = 4 mA, VCC = Min

Input Current Max

VCC = Max

Input Voltage

VI = 7V

HIGH Level

VCC = Max

Input Current

VI = 2.7V

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Datasheet ID: DM74LS283N 513792