HEF4556B
DESCRIPTION
The HEF4556B is a dual 1-of-4 decoder/demultiplexer. Each has two address inputs (A0 and A1), an active LOW enable input (E) and four mutually exclusive outputs which are active LOW (O0 to O3). When used as a decoder, E when HIGH, forces O0 to O3 HIGH. When used as a demultiplexer, the appropriate output is selected by the information on A0 and A1 with E as data input. All unselected outputs are HIGH.
HEF4556B MSI
Fig.2 Pinning diagram.
HEF4556BP(N): HEF4556BD(F): HEF4556BT(D):
16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America PINNING E A0 and A1 O0 to O3 enable inputs (active LOW) address inputs outputs (active LOW)
FAMILY DATA, IDD LIMITS category MSI See Family Specifications
Fig.1 Functional diagram.
January 1995
Philips Semiconductors
Product specification
Dual 1-of-4 decoder/demultiplexer
HEF4556B MSI
Fig.3 Logic diagram (one decoder/multiplexer).
TRUTH TABLE INPUTS...
