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HD74AC182/HD74ACT182
Carry Lookhead Generator
Description
The HD74AC182/HD74ACT182 is a high-speed carry lookahead generator. It is generally used with the HD74AC181 or HD74AC381 4-bit arithmetic logic unit to provide high-speed lookahead over word lengths of more than four bits.
Features
* Outputs Source/Sink 24 mA * HD74ACT182 has TTL-Compatible Inputs
Pin Arrangement
G1 1 P1 2 G0 3 P0 4 G3 5 P3 6 P7 GND 8 (Top view)
16 VCC 15 P2 14 G2 13 Cn 12 Cn+X 11 Cn+y 10 G 9 Cn+z
HD74AC182/HD74ACT182
Logic Symbol
P0 G0
P1 G1
P2 G2
P3 G3 G
Cn P Cn+x Cn+y Cn+z
Pin Names
Cn G0, G2 G1 G3 P 0, P 1 P2 P3 C n + x to Cn + z G P Carry Input Carry Generate Inputs (Active Low) Carry Generate Input (Active Low) Carry Generate Input (Active Low) Carry Propagate Inputs (Active Low) Carry Propagate Input (Active Low) Carry Propagate Input (Active Low) Carry Outputs Carry Generate Output (Active Low) Carry Propagate Output (Active Low)
2
HD74AC182/HD74ACT182
Logic Diagram
Cn G0 P0 G1 P1 G2 P2 G3 P3
Cn+x
Cn+y
Cn+z
G
P
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Functional Description
The HD74AC182/HD74ACT182 carry lookahead generator accepts up to four pairs of Active Low Carry Propagate (P 0 to P 3) and Carry Generate (G 0 to G 3) signals and an Active High Carry input (Cn) and provides anticipated Active High carries (Cn + x, C n + y , Cn + z ) across four groups of binary adders. The HD74AC182/HD74ACT182 also has Active Low Carry Propagate ( P) and Carry Generate (G) outputs which may be used for further level of lookahead. The logic equations provided at the outputs are: C n + x = G0 + P0Cn C n + y = G1 + P1G0 + P1P0C n C n + z = G2 + P2G1 + P2P1G0 + P2P1P 0C n G = G3 + P3G2 + P3P2G1 + P3P2P 1G0 P = P3P 2P 1P 0 Also, the HD74AC182/HD74ACT182 can be used with binary ALUs in an active Low or active High input operand mode. The connections (Figure a) to and from the ALU to the carry lookahead generator are identical in both cases. Carries are rippled between lookahead blocks. The critical speed path follows the circled numbers. There are several possible arrangements for the carry interconnects, but all achieve about the same speed. A 28-bit ALU is formed by dropping the last HD74AC182/HD74ACT182.
3
HD74AC182/HD74ACT182
Truth Table
Inputs Cn X L X H X X L X X H X X X L X X X H G0 H H L X X H H X L X X X H H X X L X X X X H X X X L H X X X L H: L: X: High Voltage Level Low Voltage Level Immaterial P0 H X X L X H X X X L X X H X X X X L H H H L X X X H H H X L X X X X H H X X L X H X X X L L X H X X X X L L X X H X X X X L X H X X L H H H H L X X X X H H H X L X X H X X X X L L L X H X X X X L L X X H X L H H H H L X X X H X X X X L L L X X X H L G1 P1 G2 P2 G3 P3 Outputs Cn + x L L H H L L L H H H L L L L H H H H H H H H L L L L H H H H L Cn + y Cn + z G P
4
HD74AC182/HD74ACT182
DC Characteristics (unless otherwise specified)
Item Maximum quiescent supply current Maximum quiescent supply current Maximum ICC/input (HD74ACT182) 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
AC Characteristics: HD74AC182
Ta = +25C CL = 50 pF Item Propagation delay Pn to P Propagation delay Pn to P Propagation delay Cn to Cn + x, y, z Propagation delay Cn to Cn + x, y, z Propagation delay Pn or Gn to Cn + x, y, z Propagation delay Pn or Gn to Cn + x, y, z Note: 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 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 Typ 8.0 5.5 8.0 5.5 9.5 7.5 9.0 7.0 10.5 8.0 11.5 9.0 Max 10.5 8.0 10.5 8.0 12.0 10.0 12.0 10.0 13.0 10.5 14.0 11.5 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 11.5 9.0 11.5 9.0 13.0 11.0 13.0 11.0 14.0 11.5 15.5 12.5 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
5
HD74AC182/HD74ACT182
AC Characteristics: HD74ACT182
Ta = +25C CL = 50 pF Item Propagation delay Pn to P Propagation delay Pn to P Propagation delay Cn to Cn + x, y, z Propagation delay Cn to Cn + x, y, z Propagation delay Pn or Gn to Cn + x, y, z Propagation delay Pn or Gn to Cn + x, y, z Note: Symbol 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 Min 1.0 1.0 1.0 1.0 1.0 1.0 Typ 7.0 8.0 9.0 9.0 9.0 10.0 Max 9.0 10.0 11.0 11.0 11.0 12.5 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 Max 10.0 11.0 12.0 12.0 12.0 13.5 Unit 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 50.0 Unit pF pF Condition VCC = 5.5 V VCC = 5.0 V
6
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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