DESCRIPTION
The HCF4008B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. The HCF4008B consists of four full adder stages with fast look ahead carry provision from stage to stage. Circuitry is included to provide a fast ”parallel carry out” to permit high speed operation in arithmetic sections using several HCF4008B’s.

■ HIGH SPEED OPERATION : SUM IN TO SUM OUT 160ns (Typ.) CARRY IN TO CARRY OUT 50ns (Typ.) at VDD = 10V , CL = 50pF
■ 4 SUM OUTPUTS PLUS PARALLEL LOOK-AHEAD CARRY OUTPUT
■ QUIESCENT CURRENT SPECIFIED UP TO 20V
■ 5V, 10V AND 15V PARAMETRIC RATINGS
■ INPUT LEAKAGE CURRENT II = 100nA (MAX) AT VDD = 18V TA = 25°C
■ 100% TESTED FOR QUIESCENT CURRENT
■ MEETS ALL REQUIREMENTS OF JEDEC JESD13B ” STANDARD SPECIFICATIONS FOR DESCRIPTION OF B SERIES CMOS DEVICES”