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HD74AC283/HD74ACT283
4-bit Binary Full Adder with Fast Carry
Description
The HD74AC283/HD74ACT283 high-speed 4-bit binary full adder with internal carry lookahead accepts two 4-bit binary works (A0 - A3, B0 - B 3) and a Carry input (C0). It generates the binary Sum outputs (S0 - S 3) and the Carry output (C4) from the most significant bit. The HD74AC283/HD74ACT283 will operate with either active High or active Low operands (positive or negative logic).
Features
* Outputs Source/Sink 24 mA * HD74ACT283 has TTL-Cmpatible Inputs
Pin Arrangement
S1 1 B1 2 A1 3 S0 4 A0 5 B0 6 C0 7 GND 8 (Top view)
16 VCC 15 B2 14 A2 13 S2 12 A3 11 B3 10 S3 9 C4
HD74AC283/HD74ACT283
Logic Symbol
A0 B0 A1 B1 A2 B2 A3 B3 C0 C4
S0
S1
S2
S3
Pin Names
A0 - A3 B0 - B3 C0 S0 - S3 C4 A Operand Inputs B Operand Inputs Carry Input Sum Outputs Carry Output
Functional Description
The HD74AC283/HD74ACT283 adds two 4-bit binary words (A plus B) plus the incoming Carry (C0). The binary sum appears on the Sum (S0 - S3) and outgoing carry (C4) outputs. The binary weight of the various inputs and outputs is indicated by the subscript numbers, representing powers of two. 20 (A0 + B0 + C0) + 21 (A1 + B1) + 22 (A2 + B2) + 23 (A3 + B3) = S0 + 2S1 + 4S2 + 8S3 + 16C4 Where (+) = plus Interchanging inputs of equal weight does not affect the operation. Thus C0, A0, B0 can be arbitrarily assigned to pins 5, 6 and 7 for DIPS. Due to the symmetry of the binary add function, the HD74AC283/HD74ACT283 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 a. Note that if C0 is not used it must be tied Low for active High logic or tied High for active Low logic. Due to pin limitations, the intermediate carries of the HD74AC283/HD74ACT283 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 b shows how to make a 3-bit adder. Tying the operand inputs of the fourth adder (A 3, B3) Low makes S3 dependent only on, and equal to, the carry from the third adder. Using somewhat the same principle Figure c shows a way of dividing the HD74AC283/HD74ACT283 into a 2-bit and a 1-bit adder. The third stage adder (A2, B 2, S 2) is used merely as a means of getting a carry (C10) signal into the fourth stage (via A 2 and B2) and bringing out the carry from the second stage on S2. Note that as long as A 2 and B2 are the same, whether High or Low, they do not influence S2. Similarly, when A 2 and B2 are the same the carry into the third stage does not influence the carry out of the third
2
HD74AC283/HD74ACT283
stage. Figure d shows a method of implementing a 5-input encoder, where the inputs are equally weighted. The outputs S0, S 1 and S2 present a binary number equal to the number of inputs I1 - I5 that are true. Figure e shows one method of implementing a 5-input majority gate. When three or more of the inputs I1 - I5 are true, the output M5 is true. Fig. a Active HIGH varsus Active LOW Interpretation
C0 Logic levels Active HIGH Active LOW L 0 1 A0 L 0 1 A1 H 1 0 A2 L 0 1 A3 H 1 0 B0 H 1 0 B1 L 0 1 B2 L 0 1 B3 H 1 0 S0 H 1 0 S1 H 1 0 S2 L 0 1 S3 L 0 1 C4 H 1 0
Active HIGH: 0 + 10 + 9 = 3 + 16 Active LOW: 1 + 5 + 6 = 12 + 0
L
A0 B0 A1 B1 A2 B2 A3 B3 C0 C4
S0
S1
S2
S3 C3
Fig. b 3-bit Adder
C10 A0 B0 A1 B1 A10 B10
A0 B0 A1 B1
A2 B2 A3 B3 C4 C11
C0
C0
S0
S1
S2
S3
S0
S1
C2
S10
Fig. c 2-bit and 1-bit adders
3
HD74AC283/HD74ACT283
I3 I1 I2 L I4 I5
A0 B0 A1 B1 A2 B2 A3 B3
C0
C4
S0
S1
S2
S3
20
21
22
Fig. d 5-Input Encoder
I3 I1 I2 I4 I5
A0 B0 A1 B1 A2 B2 A3 B3
C0
C4
S0
S1
S2
S3
M5
Fig. e 5-Input Majority Gate
4
HD74AC283/HD74ACT283
Logic Diagram
C0 A0 B0 A1 B1 A2 B2 A3 B3
S0
S1
S2
S3
C4
Please note that this diagram is provided only for the understanding of logic operations and shoudl not be used to estimate propagation delays.
DC Characteristics (unless otherwise specified)
Item Maximum quiescent supply current Maximum quiescent supply current Maximum ICC/input (HD74ACT283) Symbol I CC I CC I CCT Max 80 8.0 1.5 Unit A A mA Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25C VIN = VCC - 2.1 V, VCC = 5.5 V, Ta = Worst case
5
HD74AC283/HD74ACT283
AC Characteristics: HD74AC283
Ta = +25C CL = 50 pF Item Propagation delay C0 to S n Propagation delay C0 to S n Propagation delay An or Bn to S n Propagation delay An or Bn to S n Propagation delay C0 to C4 Propagation delay C0 to C4 Propagation delay An or Bn to C4 Propagation delay An or Bn to C4 Note: t PHL t PLH t PHL t PLH t PHL t PLH t PHL Symbol t PLH VCC (V)*1 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Typ 11.5 9.5 10.5 8.5 14.0 11.5 13.5 11.0 9.5 7.5 10.0 8.0 11.5 9.5 12.0 10.0 Max 15.0 11.5 14.0 10.5 17.0 13.5 16.5 13.0 12.5 9.5 13.0 10.0 14.5 11.5 15.0 12.0 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 16.5 12.5 15.5 11.5 18.5 14.5 18.0 14.0 15.5 10.5 14.0 11.0 16.0 12.5 16.5 13.0 ns ns ns ns ns ns ns Unit ns
1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V
6
HD74AC283/HD74ACT283
AC Characteristics: HD74ACT283
Ta = +25C CL = 50 pF Item Propagation delay C0 to S n Propagation delay C0 to S n Propagation delay An or Bn to S n Propagation delay An or Bn to S n Propagation delay C0 to C4 Propagation delay C0 to C4 Propagation delay An or Bn to C4 Propagation delay An or Bn to C4 Note: Symbol t PLH t PHL t PLH t PHL t PLH t PHL t PLH t PHL VCC (V)*1 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Typ 11.5 10.0 13.0 12.0 9.0 10.0 11.0 11.5 Max 13.5 12.0 15.0 14.0 11.0 12.0 13.0 13.5 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 14.5 13.0 16.5 15.5 12.0 13.0 14.0 14.5 Unit ns ns ns ns ns ns ns ns
1. Voltage Range 5.0 is 5.0 V 0.5 V
Capacitance
Item Input capacitance Power dissipation capacitance Symbol CIN CPD Typ 4.5 60.0 Unit pF pF Condition VCC = 5.5 V VCC = 5.0 V
7
19.20 20.00 Max 16 9 7.40 Max 6.30
Unit: mm
1 1.3
1.11 Max
8
0.51 Min
2.54 Min 5.06 Max
7.62
2.54 0.25
0.48 0.10
0.25 - 0.05 0 - 15
Hitachi Code JEDEC EIAJ Weight (reference value)
+ 0.13
DP-16 Conforms Conforms 1.07 g
Unit: mm
10.06 10.5 Max 16 9
5.5
1
*0.22 0.05 0.20 0.04
8 0.80 Max
2.20 Max
0.20 7.80 + 0.30 -
1.15 0 - 8 0.70 0.20
1.27 *0.42 0.08 0.40 0.06
0.12 M
Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA -- Conforms 0.24 g
*Dimension including the plating thickness Base material dimension
0.10 0.10
0.15
Unit: mm
9.9 10.3 Max 16 9 3.95 1 1.27 0.635 Max 8
0.11 0.14 + 0.04 - 1.75 Max
*0.22 0.03 0.20 0.03
0.10 6.10 + 0.30 -
1.08 0 - 8
0.67 0.60 + 0.20 -
*0.42 0.08 0.40 0.06
0.15 0.25 M
*Dimension including the plating thickness Base material dimension
Hitachi Code JEDEC EIAJ Weight (reference value)
FP-16DN Conforms Conforms 0.15 g
Unit: mm
5.00 5.30 Max 16 9 4.40 1
0.08 *0.22 + 0.07 -
8 0.65 1.0 6.40 0.20 0 - 8 0.50 0.10
0.20 0.06
0.13 M 0.65 Max
*0.17 0.05 0.15 0.04
1.10 Max
0.10
0.07 +0.03 -0.04
*Dimension including the plating thickness Base material dimension
Hitachi Code JEDEC EIAJ Weight (reference value)
TTP-16DA -- -- 0.05 g
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party's rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi's sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
URL
NorthAmerica : http:semiconductor.hitachi.com/ Europe : http://www.hitachi-eu.com/hel/ecg Asia (Singapore) : http://www.has.hitachi.com.sg/grp3/sicd/index.htm Asia (Taiwan) : http://www.hitachi.com.tw/E/Product/SICD_Frame.htm Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm Japan : http://www.hitachi.co.jp/Sicd/indx.htm For further information write to:
Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 778322 Hitachi Asia Pte. Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: <886> (2) 2718-3666 Fax: <886> (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: <852> (2) 735 9218 Fax: <852> (2) 730 0281 Telex: 40815 HITEC HX
Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.

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