HEF4008 データシートの表示（PDF） - Philips Electronics
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HEF4008 Datasheet PDF : 5 Pages
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Philips Semiconductors
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.
Product specification
HEF4008B
MSI
Fig.1 Functional diagram.
HEF4008BP(N):
16-lead DIL; plastic
(SOT38-1)
HEF4008BD(F):
16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4008BT(D):
16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
January 1995
2
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
A
B
COUT
S
L
LL
L
L
L
LH
L
H
L
HL
L
H
L
HH
H
L
H
LL
L
H
H
LH
H
L
H
HL
H
L
H
HH
H
H
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
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