December 1990

2

Philips Semiconductors

Product specification

Look-ahead carry generator

74HC/HCT182

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

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

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:

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.

GG

3

P

P

P

++

+

=

PP

=

QUICK REFERENCE DATA

Notes

ORDERING INFORMATION

See

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HC

HCT

propagation delay

11

17

14

14

21

17

ns

ns

ns

input capacitance

3.5

3.5

pF

power dissipation capacitance per

package

notes 1 and 2

50

50

pF