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HEF4008B

NXP
Part Number HEF4008B
Manufacturer NXP
Description 4-bit binary full adder
Published Mar 23, 2005
Detailed Description INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC04 LOCMOS HE4000B Logic Family ...
Datasheet PDF File HEF4008B PDF File

HEF4008B
HEF4008B

Overview
INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC • The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4008B MSI 4-bit binary full adder Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification 4-bit binary full adder DESCRIPTION The HEF4008B is a 4-bit binary full adder with two 4-bit data inputs (A0 to A3, B0 to B3), a carry input (CIN), four sum outputs (S0 to S3), and a carry output (COUT).
The IC uses full look-ahead across 4-bits to generate COUT.
This minimizes the necessity for extensive look-ahead and carry-cascading circuits.
HEF4008B MSI Fig.
2 Pinning diagram.
PINNING A0 to A3 B0 to B3 S0 to S3 CIN COUT data inputs data inputs sum outputs carry input carry output TRUTH TABLE (one adder) CIN L L L L H Fig.
1 Functional diagram.
H H H HEF4008BP(N): HEF4008BD(F): HEF4008BT(D): 16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America FAMILY DATA, IDD LIMITS category MSI See Family Specifications A L L H H L L H H B L H L H L H L H COUT L L L H L H H H S L H H L H L L H January 1995 2 Philips Semiconductors Product specification 4-bit binary full adder HEF4008B MSI Fig.
3 Logic diagram.
January 1995 3 Philips Semiconductors Product specification 4-bit binary full adder AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V Propagation delays sum in → sum out HIGH to LOW 5 10 15 5 LOW to HIGH sum in → COUT HIGH to LOW 10 15 5 10 15 5 LOW to HIGH CIN → sum out HIGH to LOW 10 15 5 10 15 5 LOW to HIGH CIN → COUT HIGH to LOW 10 15 5 10 15 5 LOW to HIGH Output transition times HIGH to LOW 10 15 5 10 15 5 LOW to HIGH 10 15 tTLH tTHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL 150 55 40 135 55 40 125 50 35 100 45 30 130 50 35 115 50 35 90 35 25 75 35 25 60 30 20 60 30 20...


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