Datasheet

January 1995 2
Philips Semiconductors Product specification
Dual 1-of-4 decoder/demultiplexer
HEF4555B
MSI
DESCRIPTION
The HEF4555B is a dual 1-of-4 decoder/demultiplexer.
Each has two address inputs (A
0
and A
1
), an active LOW
enable input (E) and four mutually exclusive outputs which
are active HIGH (O
0
to O
3
). When used as a decoder,
E when HIGH, forces O
0
to O
3
LOW. When used as a
demultiplexer, the appropriate output is selected by the
information on A
0
and A
1
with E as data input. All
unselected outputs are LOW.
Fig.1 Functional diagram.
PINNING
FAMILY DATA, I
DD
LIMITS category MSI
See Family Specifications
HEF4555BP(N): 16-lead DIL; plastic
(SOT38-1)
HEF4555BD(F): 16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4555BT(D): 16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
E enable inputs (active LOW)
A
0
and A
1
address inputs
O
0
to O
3
outputs (active HIGH)
Fig.2 Pinning diagram.