CD4556 Dual Binary 1 of 4 Decoder Inverter

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CD4556 is a part of the CD4000 IC series. CD4556 are dual one-of-four decoders/demultiplexers. Each decoder has two select inputs (A and B), an Enable input (E), and four mutually exclusive outputs. The IC is available in 16-lead hermetic dual-in-line ceramic packages. The CD4556 offers a wide array of features such as ESD protection, thermal overload protection, and a wide array of workable voltages. The IC is very simple to use and is easily interfaceable with CMOS, NMOS, and TTL

What is a Decoder?

A decoder/demultiplexer is a combinational logic circuit & an integral part of todays consumer scale electronics. It is designed to switch one common input line to one of several separate output lines. So, A demultiplexer converts a serial data signal at the input to a parallel data at its output lines.

CD4556 Key Features

High Voltage Type (20V Rating)
CD4555BMS: Outputs High on Select
CD4556BMS: Outputs Low on Select
Expandable with Multiple Packages
100% Tested for Quiescent Current at 20V
Standardized, Symmetrical Output Characteristics
Maximum Input Current of 1µA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
Noise Margin (Over Full Package/Temperature Range)
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V
5V, 10V and 15V Parametric Ratings

CD4556 Pinout

Pin No	Pin Name	Description
1	E’	invert Enable pin of decoder 1
2	A	input pin A of decoder 1
3	B	input pin B of decoder 1
4	Q0A’	invert output pin 0 0f decoder A
5	Q1A’	invert output pin 1 0f decoder A
6	Q2A’	invert output pin 2 0f decoder A
7	Q3A’	invert output pin 3 0f decoder A
8	VSS	source supply
9	Q3B’	invert output pin 3 0f decoder B
10	Q2B’	invert output pin 2 0f decoder B
11	Q1B’	invert output pin 1 0f decoder B
12	Q0B’	invert output pin 0 0f decoder B
13	B	input pin B of decoder 2
14	A	input pin A of decoder 2
15	E’	invert enable pin of decoder 2
16	VDD	drain supply