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HD74AC182
Carry Lookahead Generator
REJ03D0258–0200Z
(Previous ADE-205-378 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74AC182 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
• Ordering Information
Part Name Package Type Package Code Package Abbreviation Taping Abbreviation (Quantity)
HD74AC182FPEL SOP-16 pin (
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HD74AC182 Logic Symbol P0 G0 P1 G1 P2 G2 P3 G3 G Cn P Cn+x Cn+y Cn+z Pin Names Cn Carry Input G , G Carry Generate Inputs (Active Low) 0 2 G Carry Generate Input (Active Low) 1 G Carry Generate Input (Active Low) 3 P , P Carry Propagate Inputs (Active Low) 0 1 P Carry Propagate Input (Active Low) 2 P Carry Propagate Input (Active Low) 3 C to C Carry Outputs n + x n + z G Carry Generate Output (Active Low) P Carry Propagate Output (Active Low) Logic Diagram Cn G0P0 G1P1 G2P2 G3P3 Cn+x Cn+y Cn+z G
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HD74AC182 C = G + P C n + x 0 0 n C = G + P G + P P C n + y 1 1 0 1 0 n C = G + P G + P P G + P P P C n + z 2 2 1 2 1 0 2 1 0 n G = G + P G + P P G + P P P G 3 3 2 3 2 1 3 2 1 0 P = P P P P 3 2 1 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 t
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HD74AC182 Absolute Maximum Ratings Item Symbol Ratings Unit Condition Supply voltage V –0.5 to 7 V CC DC input diode current I –20 mA V = –0.5V IK I 20 mA V = Vcc+0.5V I DC input voltage V –0.5 to Vcc+0.5 V I DC output diode current I –50 mA V = –0.5V OK O 50 mA V = Vcc+0.5V O DC output voltage V –0.5 to Vcc+0.5 V O DC output source or sink current I ±50 mA O DC V or ground current per output pin I , I ±50 mA CC CC GND Storage temperature Tstg –65 to +150 °C Recommended Operating Conditions Item
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HD74AC182 AC Characteristics Ta = +25°C Ta = –40°C to +85°C C = 50 pF C = 50 pF L L 1 Item Symbol V (V)* Min Typ Max Min Max Unit CC Propagation delay t 3.3 1.0 8.0 10.5 1.0 11.5 ns PLH P to P 5.0 1.0 5.5 8.0 1.0 9.0 n Propagation delay t 3.3 1.0 8.0 10.5 1.0 11.5 ns PHL P to P 5.0 1.0 5.5 8.0 1.0 9.0 n Propagation delay t 3.3 1.0 9.5 12.0 1.0 13.0 ns PLH C to C 5.0 1.0 7.5 10.0 1.0 11.0 n n + x, y, z Propagation delay t 3.3 1.0 9.0 12.0 1.0 13.0 ns PHL C to C 5.0 1.0 7.0 10.0 1.0 11.0 n n + x,
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HD74AC182 Package Dimensions As of January, 2003 Unit: mm 10.06 10.5 Max 9 16 1 8 + 0.20 7.80 – 0.30 0.80 Max 1.15 0˚ – 8˚ 1.27 0.70 ± 0.20 *0.40 ± 0.06 0.15 M 0.12 Package Code FP-16DAV JEDEC — JEITA Conforms *Ni/Pd/Au plating Mass (reference value) 0.24 g As of January, 2003 Unit: mm 9.9 10.3 Max 16 9 1 8 1.27 + 0.10 6.10 – 0.30 1.08 0.635 Max 0˚ – 8˚ + 0.67 0.60 – 0.20 *0.40 ± 0.06 0.15 0.25 M Package Code FP-16DNV JEDEC Conforms JEITA Conforms *Ni/Pd/Au plating Mass (reference value) 0.15
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Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appr
