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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
* The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications * The IC06 74HC/HCT/HCU/HCMOS Logic Package Information * The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT283 4-bit binary full adder with fast carry
Product specification File under Integrated Circuits, IC06 December 1990
Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
FEATURES * High-speed 4-bit binary addition * Cascadable in 4-bit increments * Fast internal look-ahead carry * Output capability: standard * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT283 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT283 add two 4-bit binary words (An plus Bn) plus the incoming carry. The binary sum appears on the sum outputs (1 to 4) and the out-going carry (COUT) according to the equation:
74HC/HCT283
CIN + (A1 + B1) + 2(A2 + B2) + +4(A3 + B3) + 8(A4 + B4) = = 1 + 22 + 43 + 84 + 16COUT Where (+) = plus. Due to the symmetry of the binary add function, the "283" can be used with either all active HIGH operands (positive logic) or all active LOW operands (negative logic); see function table. In case of all active LOW operands the results 1 to 4 and COUT should be interpreted also as active LOW. With active HIGH inputs, CIN must be held LOW when no "carry in" is intended. Interchanging inputs of equal weight does not affect the operation, thus CIN, A1, B1 can be assigned arbitrarily to pins 5, 6, 7, etc. See the "583" for the BCD version.
QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns TYPICAL SYMBOL tPHL/ tPLH PARAMETER propagation delay CIN to 1 CIN to 2 CIN to 3 CIN to 4 An or Bn to n CIN to COUT An or Bn to COUT CI CPD Notes 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC - 1.5 V December 1990 2 input capacitance power dissipation capacitance per package notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 16 18 20 23 21 20 20 3.5 88 15 21 23 27 25 23 24 3.5 92 ns ns ns ns ns ns ns pF pF HCT UNIT
Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
ORDERING INFORMATION See "74HC/HCT/HCU/HCMOS Logic Package Information". PIN DESCRIPTION PIN NO. 4, 1, 13, 10 5, 3, 14, 12 6, 2, 15, 11 7 8 9 16 SYMBOL 1 to 4 A1 to A4 B1 to B4 CIN GND COUT VCC NAME AND FUNCTION sum outputs A operand inputs B operand inputs carry input ground (0 V) carry output positive supply voltage
74HC/HCT283
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
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Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
74HC/HCT283
Fig.4 Functional diagram.
FUNCTION TABLE PINS logic levels active HIGH active LOW Note 1. H = HIGH voltage level L = LOW voltage level 2. example 1001 1010 ----10011 3. for active HIGH, example = (9 + 10 = 19) 4. for active LOW, example = (carry + 6 + 5 = 12) CIN A1 L 0 1 L 0 1 A2 H 1 0 A3 L 0 1 A4 H 1 0 B1 H 1 0 B2 L 0 1 B3 L 0 1 B4 H 1 0 1 H 1 0 2 H 1 0 3 L 0 1 4 L 0 1 COUT H 1 0
(3) (4)
EXAMPLE(2)
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Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
74HC/HCT283
Fig.5 Logic diagram.
December 1990
5
Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER min. tPHL/ tPLH propagation delay CIN to 1 propagation delay CIN to 2 propagation delay CIN to 3 propagation delay CIN to 4 propagation delay An or Bn to n propagation delay CIN to COUT propagation delay An or Bn to COUT output transition time +25 typ. 52 19 15 58 21 17 63 23 18 74 27 22 69 25 20 63 23 18 63 23 18 19 7 6 -40 to +85 max. min. 160 32 27 180 36 31 195 39 33 230 46 39 210 42 36 195 39 33 195 39 33 75 15 13 max. 200 40 34 225 45 38 245 49 42 290 58 49 265 53 45 245 49 42 245 49 42 95 19 16 -40 to +125 min. max. 240 48 41 270 54 46 295 59 50 345 69 59 315 63 54 295 59 50 295 59 50 110 22 19 ns UNIT
74HC/HCT283
TEST CONDITIONS VCC WAVEFORMS (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Fig.6
tPHL/ tPLH
ns
Fig.6
tPHL/ tPLH
ns
Fig.6
tPHL/ tPLH
ns
Fig.6
tPHL/ tPLH
ns
Fig.6
tPHL/ tPLH
ns
Fig.6
tPHL/ tPLH
ns
Fig.6
tTHL/ tTLH
ns
Fig.6
December 1990
6
Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI Note to HCT types
74HC/HCT283
The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications. To determine ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT CIN B2, A2, A1 B1 B4, A4, A3, B3
UNIT LOAD COEFFICIENT 1.50 1.00 0.40 0.50
AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HCT SYMBOL PARAMETER min. tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tTHL/ tTLH propagation delay CIN to 1 propagation delay CIN to 2 propagation delay CIN to 3 propagation delay CIN to 4 propagation delay An or Bn to n propagation delay CIN to COUT propagation delay An or Bn to COUT output transition time +25 typ. 18 25 27 31 29 27 28 7 -40 to +85 max. min. 31 43 46 53 49 46 48 15 max. 39 54 58 66 61 58 60 19 -40 to +125 min. max. 47 65 69 80 74 69 72 22 ns ns ns ns ns ns ns ns 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 Fig.6 Fig.6 Fig.6 Fig.6 Fig.6 Fig.6 Fig.6 Fig.6 UNIT VCC (V) WAVEFORMS TEST CONDITIONS
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Philips Semiconductors
Product specification
4-bit binary full adder with fast carry
AC WAVEFORMS APPLICATION INFORMATION
74HC/HCT283
Fig.7 3-bit adder.
(1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.6
Waveforms showing the inputs (CIN, An, Bn) to the outputs (n, COUT) propagation delays and the output transition times.
Fig.8 2-bit and 1-bit adder.
Fig.9 5-input encoder.
Notes to Figs 7 to 10 Figure 7 shows a 3-bit adder using the "283". Tying the operand inputs of the fourth adder (A3, B3) LOW makes 3 dependent on, and equal to, the carry from the third adder. Based on the same principle, Figure 8 shows a method of dividing the "283" into a 2-bit and 1-bit adder. The third stage adder (A2, B2, 2) is used simply as means of transferring the carry into the fourth stage (via A2 and B2) and transferring the carry from the second stage on 2. Note that as long as long as A2 and B2 are the same, HIGH or LOW, they do not influence 2. Similarly, when A2 and B2 are the same, the carry into the third stage does not influence the carry out of the third stage. Figure 9 shows a method of implementing a 5-input encoder, where the December 1990 8 Fig.10 5-input majority gate.
inputs are equally weighted. The outputs 0, 1 and 2 produce a binary number equal to the number inputs (I1 to I5) that are HIGH. Figure 10 shows a method of implementing a 5-input majority gate. When three or more inputs (I1 to I5) are HIGH, the output M5 is HIGH. PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines".

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