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 74HC/HCT182 anticipated active HIGH carries (Cn+x, Cn+y, Cn+z) across four groups of binary adders. FEATURES • Provides carry look-ahead across a group of four ALU’s The “182” also has active LOW carry propagate (P) and carry generate (G) outputs which may be used for further levels of look-ahead. • Multi-level look-ahead for high-speed arithmetic operation over long word length • Output capability: standard • ICC category: MSI The logic equations provided at the outputs are: GENERAL DESCRIPTION Cn+x = G0 + P0Cn Cn+y = G1 + P1G0 + P1P0Cn Cn+z = G2 + P2G1 + P2P1G0 + P2P1P0Cn 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. 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. 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 TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC tPHL/ tPLH propagation delay Pn to P Cn to any output Pn or Gn to any output CI input capacitance CPD power dissipation capacitance per package CL = 15 pF; VCC = 5 V notes 1 and 2 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 HCT 2 11 17 14 14 21 17 ns ns ns 3.5 3.5 pF 50 50 pF Philips Semiconductors Product specification Look-ahead carry generator 74HC/HCT182 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 3, 1, 14, 5 G0 to G3 carry generate inputs (active LOW) 4, 2, 15, 6 P0 to P3 carry propagate inputs (active LOW) 7 P carry propagate output (active LOW) 8 GND ground (0 V) 9 Cn+z function output 10 G carry generate output (active LOW) 11 Cn+y function output 12 Cn+x function output 13 Cn carry input (active HIGH) 16 VCC positive supply voltage Fig.1 Pin configuration. December 1990 Fig.2 Logic symbol. 3 Fig.3 IEC logic symbol. 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 74HC/HCT182 FUNCTION TABLE INPUTS G0 Cn P0 G1 P1 OUTPUTS G2 P2 G3 P3 Cn+x Cn+y Cn+z G X L X H H H L X H X X L X X L X X H X H H X L X X H X X X L H H H L X X H X X X L L X X X L X X H H X X H X X H H H X H X X H H H H H X X X L L L L X X X H X X L X X X X L X L X X X X L L L X X X X L L L H H H H X X X H X X H H X X H X X H H H X H X X H H H H H X X X H H H H X X X L X X L X X X X L X L X X X X L L L X X X X L L L L L L L L L H H H X X X L X H X X L L L L H H H X X H X L X X X H L Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care December 1990 P 5 H H H H L Philips Semiconductors Product specification Look-ahead carry generator 74HC/HCT182 DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 min. −40 to +85 typ. max. min. max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max. tPHL/ tPLH propagation delay Pn to P 30 14 11 120 24 20 150 30 26 180 36 31 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Cn to any output 55 20 16 170 34 29 215 43 37 255 51 43 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Pn to G 47 17 14 145 29 25 180 36 31 220 44 38 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Pn to Cn+n 47 17 14 145 29 25 180 36 31 220 44 38 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Gn to Cn+n 44 16 13 135 27 23 170 34 29 205 41 35 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Gn to G 41 15 12 135 27 23 170 34 29 205 41 35 ns 2.0 4.5 6.0 Fig.6 tTHL/ tTLH output transition time 19 7 6 75 15 13 95 19 16 110 22 19 ns 2.0 4.5 6.0 Fig.6 December 1990 6 Philips Semiconductors Product specification Look-ahead carry generator 74HC/HCT182 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard ICC category: MSI Note to HCT types The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications. To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below. INPUT UNIT LOAD COEFFICIENT G0, G1, P0, P1, P2 G3 G2, P3, Cn 1.50 0.30 1.25 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HCT SYMBOL PARAMETER +25 min. −40 to +85 typ. max. min. max. −40 to +125 min. UNIT VCC (V) WAVEFORMS max. tPHL/ tPLH propagation delay Pn to P 17 28 35 42 ns 4.5 Fig.6 tPHL/ tPLH propagation delay Cn to any output 26 43 54 65 ns 4.5 Fig.6 tPHL/ tPLH propagation delay Pn to G 20 33 41 50 ns 4.5 Fig.6 tPHL/ tPLH propagation delay Pn to Cn+n 20 33 41 50 ns 4.5 Fig.6 tPHL/ tPLH propagation delay Gn to Cn+n, Gn to G 18 32 40 48 ns 4.5 Fig.6 tTHL/ tTLH output transition time 7 15 19 22 ns 4.5 Fig.6 December 1990 7 Philips Semiconductors Product specification Look-ahead carry generator 74HC/HCT182 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.6 Waveforms showing the input (Pn, Cn, Gn) to any output propagation delays and the output transition times. APPLICATION INFORMATION A and B inputs and F outputs of “181” are not shown. Fig.7 16-bit ALU two-level look-ahead. A and B inputs and F outputs of “181” are not shown. Fig.8 32-bit ALU two-level look-ahead over 16-bit groups. December 1990 8 Philips Semiconductors Product specification Look-ahead carry generator 74HC/HCT182 A and B inputs and F outputs of “181” are not shown. Fig.9 Combined two-level look-ahead and ripple-carry ALU. A and B inputs and F outputs of “181” are not shown. Fig.10 64-bit ALU full-carry three-level look-ahead. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. December 1990 9