hd74ac182/hd74act182 carry lookahead generator ade-205-378 (z) 1st. edition sep. 2000 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 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 g 1 p 1 g 0 p 0 g 3 p p 3 gnd v cc p 2 g 2 c n c n+x c n+y g c n+z (top view)
hd74ac182/hd74act182 2 logic symbol c n g p p 0 c n+x c n+y c n+z g 0 p 1 g 1 p 2 g 2 p 3 g 3 pin names cn carry input g 0 , g 2 carry generate inputs (active low) g 1 carry generate input (active low) g 3 carry generate input (active low) p 0 , p 1 carry propagate inputs (active low) p 2 carry propagate input (active low) p 3 carry propagate input (active low) c n + x to c n + z carry outputs g carry generate output (active low) p carry propagate output (active low)
hd74ac182/hd74act182 3 logic diagram c n c n+x c n+y c n+z g 0 p 0 g 1 gp p 1 g 2 p 2 g 3 p 3 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 (c n + x , c n + y , c n + 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 = g 0 + p 0 c n c n + y = g 1 + p 1 g 0 + p 1 p 0 c n c n + z = g 2 + p 2 g 1 + p 2 p 1 g 0 + p 2 p 1 p 0 c n g = g 3 + p 3 g 2 + p 3 p 2 g 1 + p 3 p 2 p 1 g 0 p = p 3 p 2 p 1 p 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.
hd74ac182/hd74act182 4 truth table inputs outputs c n g 0 p 0 g 1 p 1 g 2 p 2 g 3 p 3 c n + x c n + y c n + z gp xh h l lh x l xl x h hx l h xxxhh l xhhhx l lh x h x l xxxlx h xl x x l h hx l x l h xxxxxhh l xxxhhhx l xhhhxhx l lhxhxhx l xxxxxl x h xxxlxxl h xl x x l x l h hxlxlxl h x xxxxhh h xxxhhhx h x hhhxhx h hhxhxhx h x xxxxl x l xxxlxxl l x lxxlxl l lxlxlxl l hx xx h xhxx h xx hx h xx xh h ll ll l h : high voltage level l : low voltage level x : immaterial
hd74ac182/hd74act182 5 dc characteristics (unless otherwise specified) item symbol max unit condition maximum quiescent supply current i cc 80 m av in = v cc or ground, v cc = 5.5 v, ta = worst case maximum quiescent supply current i cc 8.0 m av in = v cc or ground, v cc = 5.5 v, ta = 25 c maximum i cc /input (hd74act182) i cct 1.5 ma v in = v cc ?2.1 v, v cc = 5.5 v, ta = worst case ac characteristics: hd74ac182 ta = +25 c c l = 50 pf ta = ?0 c to +85 c c l = 50 pf item symbol v cc (v)* 1 min typ max min max unit propagation delay t plh 3.3 1.0 8.0 10.5 1.0 11.5 ns p n to p 5.0 1.0 5.5 8.0 1.0 9.0 propagation delay t phl 3.3 1.0 8.0 10.5 1.0 11.5 ns p n to p 5.0 1.0 5.5 8.0 1.0 9.0 propagation delay t plh 3.3 1.0 9.5 12.0 1.0 13.0 ns c n to c n + x, y, z 5.0 1.0 7.5 10.0 1.0 11.0 propagation delay t phl 3.3 1.0 9.0 12.0 1.0 13.0 ns c n to c n + x, y, z 5.0 1.0 7.0 10.0 1.0 11.0 propagation delay t plh 3.3 1.0 10.5 13.0 1.0 14.0 ns p n or g n to c n + x, y, z 5.0 1.0 8.0 10.5 1.0 11.5 propagation delay t phl 3.3 1.0 11.5 14.0 1.0 15.5 ns p n or g n to c n + x, y, z 5.0 1.0 9.0 11.5 1.0 12.5 note: 1. voltage range 3.3 is 3.3 v 0.3 v voltage range 5.0 is 5.0 v 0.5 v
hd74ac182/hd74act182 6 ac characteristics: hd74act182 ta = +25 c c l = 50 pf ta = ?0 c to +85 c c l = 50 pf item symbol v cc (v)* 1 min typ max min max unit propagation delay p n to p t plh 5.0 1.0 7.0 9.0 1.0 10.0 ns propagation delay p n to p t phl 5.0 1.0 8.0 10.0 1.0 11.0 ns propagation delay c n to c n + x, y, z t plh 5.0 1.0 9.0 11.0 1.0 12.0 ns propagation delay c n to c n + x, y, z t phl 5.0 1.0 9.0 11.0 1.0 12.0 ns propagation delay p n or g n to c n + x, y, z t plh 5.0 1.0 9.0 11.0 1.0 12.0 ns propagation delay p n or g n to c n + x, y, z t phl 5.0 1.0 10.0 12.5 1.0 13.5 ns note: 1. voltage range 5.0 is 5.0 v 0.5 v capacitance item symbol typ unit condition input capacitance c in 4.5 pf v cc = 5.5 v power dissipation capacitance c pd 50.0 pf v cc = 5.0 v
hd74ac182/hd74act182 7 package dimensions hitachi code jedec eiaj mass (reference value) dp-16 conforms conforms 1.07 g unit: mm 6.30 19.20 16 9 8 1 1.3 20.00 max 7.40 max 7.62 0.25 + 0.13 ?0.05 2.54 0.25 0.48 0.10 0.51 min 2.54 min 5.06 max 0 ?15 1.11 max hitachi code jedec eiaj mass (reference value) fp-16da conforms 0.24 g unit: mm *dimension including the plating thickness base material dimension *0.22 0.05 *0.42 0.08 0.12 0.15 m 2.20 max 5.5 10.06 0.80 max 16 9 1 8 10.5 max + 0.20 ?0.30 7.80 0.70 0.20 0 ?8 0.10 0.10 1.15 1.27 0.40 0.06 0.20 0.04
hd74ac182/hd74act182 8 hitachi code jedec eiaj mass (reference value) fp-16dn conforms conforms 0.15 g unit: mm *dimension including the plating thickness base material dimension 1.27 16 9 1 8 0.15 0.25 m 1.75 max 3.95 *0.22 0.03 9.9 0 ?8 10.3 max + 0.10 ?0.30 6.10 + 0.67 ?0.20 0.60 + 0.11 ?0.04 0.14 *0.42 0.08 0.635 max 0.40 0.06 0.20 0.03 1.08 hitachi code jedec eiaj mass (reference value) ttp-16da 0.05 g unit: mm *dimension including the plating thickness base material dimension 0.50 0.10 0 ?8 *0.17 0.05 6.40 0.20 0.10 1.10 max 0.13 m 0.65 18 16 9 4.40 5.00 5.30 max 0.07 +0.03 ?.04 0.65 max 1.0 0.20 0.06 + 0.08 ?0.07 *0.22 0.15 0.04
hd74ac182/hd74act182 9 cautions 1. hitachi neither warrants nor grants licenses of any rights of hitachi? or any third party? 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? 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? 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 fail- safes, 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? 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 copyright ? hitachi, ltd., 2000. all rights reserved. printed in japan. hitachi asia ltd. hitachi tower 16 collyer quay #20-00, singapore 049318 tel : <65>-538-6533/538-8577 fax : <65>-538-6933/538-3877 url : http://www.hitachi.com.sg url northamerica : http://semiconductor.hitachi.com/ europe : http://www.hitachi-eu.com/hel/ecg asia : http://sicapac.hitachi-asia.com japan : http://www.hitachi.co.jp/sicd/indx.htm hitachi asia ltd. (taipei branch office) 4/f, no. 167, tun hwa north road, hung-kuo building, taipei (105), taiwan tel : <886>-(2)-2718-3666 fax : <886>-(2)-2718-8180 telex : 23222 has-tp url : http://www.hitachi.com.tw 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 url : http://www.hitachi.com.hk hitachi europe ltd. electronic components group. whitebrook park lower cookham road maidenhead berkshire sl6 8ya, united kingdom tel: <44> (1628) 585000 fax: <44> (1628) 585160 hitachi europe gmbh electronic components group dornacher stra b e 3 d-85622 feldkirchen, munich germany tel: <49> (89) 9 9180-0 fax: <49> (89) 9 29 30 00 hitachi semiconductor (america) inc. 179 east tasman drive, san jose,ca 95134 tel: <1> (408) 433-1990 fax: <1>(408) 433-0223 for further information write to: colophon 2.0
|
