August 1986 Revised March 2000
DM74LS83A 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. Thisprovides 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 partiallook-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
Order Number DM74LS83AN Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
© 2000 Fairchild Semiconductor Corporation
H = HIGH Level, L = LOW Level Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs ∑1 and ∑2 and the value of the internal carry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs ∑3, ∑4, and C4.
Absolute Maximum Ratings(Note 1)
SupplyVoltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0°C to +70°C −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 absolutemaximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.75 2 0.8 −0.4 8 70 Nom 5 Max 5.25 Units V V V mA mA °CElectrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOS ICC1 ICC2 Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Supply Current Conditions VCC = Min, II =−18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max VI = 7V VCC = Max VI = 2.7V VCC = Max VI = 0.4V VCC = Max (Note 3) VCC = Max (Note 4) VCC = Max (Note 5) A or B C0 A or B C0 A or B C0 −20 19 22 2.7 3.4 0.35 0.25 0.5 0.4 0.2 0.1 40 20 −0.8 −0.4 −100 34 39 mA µA mA mA mA mA Min Typ (Note 2) Max −1.5 Units V V
Note 2:All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC1 is measured with all outputs open, all B inputs LOW and all other inputs at 4.5V, or all inputs at 4.5V. Note 5: ICC2 is measured with all outputs OPEN and all inputs grounded.
at VCC = 5V and TA = 25°C From (Input) Symbol Parameter To (Output) CL = 15 pF Min tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL 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...