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Part: 74HC/HCT182
Category:
Logic
-> CMOS/BiCMOS->HC/HCT Family
Description: Look-ahead Carry Generator
Company: Philips Semiconductors
Datasheet: Download 74HC/HCT182 datasheet File size : 156 kB
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Datasheet text preview:
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/HCT182 Look-ahead carry generator
Product specification File under Integrated Circuits, IC06 December 1990
Philips Semiconductors
Product specification
Look-ahead carry generator
FEATURES · Provides carry look-ahead across a group of four ALU's · Multi-level look-ahead for high-speed arithmetic operation over long word length · Output capability: standard · ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT182 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/HCT182 carry look-ahead generators accept up to four pairs of active LOW carry propagate (P0, P1, P2, P3) and carry generate (G0, G1, G2, G3) signals and an active HIGH carry input (Cn). The devices provide QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
74HC/HCT182
anticipated active HIGH carries (Cn+x, Cn+y, Cn+z) across four groups of binary adders. The "182" also has active LOW carry propagate (P) and carry generate (G) outputs which may be used for further levels of look-ahead. The logic equations provided at the outputs are: Cn+x = G0 + P0Cn Cn+y = G1 + P1G0 + P1P0Cn Cn+z = G2 + P2G1 + P2P1G0 + P2P1P0Cn G = G3 + P3 G2 + P3 P2 G1 + P3 P2 P1 GO P = P3 P2 P1 P0 The "182" can also be used with binary ALU's in an active LOW or active HIGH input operand mode. The connections to and from the ALU to the carry look-ahead generator are identical in both cases.
TYPICAL SYMBOL tPHL/ tPLH PARAMETER propagation delay Pn to P Cn to any output Pn or Gn to any output input capacitance power dissipation capacitance per package notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 11 17 14 3.5 50 14 21 17 3.5 50 ns ns ns pF pF HCT UNIT
CI CPD Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW): PD = CPD × VCC2 × fi + (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL × VCC2 × 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 ORDERING INFORMATION See "74HC/HCT/HCU/HCMOS Logic Package Information".
December 1990
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Philips Semiconductors
Product specification
Look-ahead carry generator
PIN DESCRIPTION PIN NO. 3, 1, 14, 5 4, 2, 15, 6 7 8 9 10 11 12 13 16 SYMBOL G0 to G3 P0 to P3 P GND Cn+z G Cn+y Cn+x Cn VCC NAME AND FUNCTION carry generate inputs (active LOW) carry propagate inputs (active LOW) carry propagate output (active LOW) ground (0 V) function output carry generate output (active LOW) function output function output carry input (active HIGH) positive supply voltage
74HC/HCT182
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
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Philips Semiconductors
Product specification
Look-ahead carry generator
74HC/HCT182
Fig.4 Functional diagram.
Fig.5 Logic diagram.
December 1990
4
Philips Semiconductors
Product specification
Look-ahead carry generator
FUNCTION 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 Notes 1. H = HIGH voltage level L = LOW voltage level X = don't care 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 P0 G1 P1 G2 P2 G3 P3 Cn+x L L H H L L L H H H L L L L
74HC/HCT182
OUTPUTS Cn+y Cn+z G P
H H H H H H H H L L L L H H H H L
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Others parts begin by 74
74-1 74-2 74-3 74-4 74-5 74-6 74-7 74-8 74-9 74-10 74-11 74-12 74-13 74-14 74-15 74-16 74-17 74-18 74-19 74-20 74-21 74-22 74-23 74-24 74-25 74-26 74-27 74-28 74-29 74-30 74-31 74-32 74-33 74-34 74-35 74-36 74-37 74-38 74-39 74-40 74-41 74-42 74-43 74-44 74-45 74-46 74-47 74-48 74-49 74-50 74-51 74-52 74-53 74-54 74-55 74-56 74-57 74-58 74-59 74-60 74-61 74-62
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