CD4555 Dual Binary 1 of 4 Decoder

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CD4555 is a part of the CD4000 IC series. On the CD4555 the outputs are high on select. When the Enable input is high, the outputs of the CD4555 remain low regardless of the state of the select inputs A and B. The CD4555BMS and CD4556BMS are similar to types MC14555 and MC14556, respectively. The CD4555BMS and CD4556BMS are supplied in 16-lead hermetic dual-in-line ceramic packages.. The IC CD4555 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.

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What is Decoder?

A decoder/demultiplexer is a combinational logic circuit & an integral part of today’s 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 parallel data at its output lines.

CD4555 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

CD4555 Pinout

Pin No	Pin Name	Description
1	E’	invert enable pin of decoder A
2	A1	input pin A of decoder A
3	B1	input pin B of decoder A
4	Q0A	output pin 0 of decoder A
5	Q1A	output pin 1 of decoder A
6	Q2A	output pin 2 of decoder A
7	Q3A	output pin 3 of decoder A
8	VSS	source supply
9	Q3B	output pin 3 of decoder B
10	Q2B	output pin 2 of decoder B
11	Q1B	output pin 1 of decoder B
12	Q0B	output pin 0 of decoder B
13	B2	input pin of decoder B
14	A2	input pin of decoder B
15	E’	invert enable pin B
16	VDD	drain supply