CD4051 Single 8-channel Multiplexer Demultiplexer

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The CD4051 is a part of CD4000 IC series, made by using the complementary MOS (CMOS) technology. CD4051 is a single 8-channel multiplexer having three binary control inputs. A, B, and C, and an inhibit input. The three binary signals select 1 of 8 channels to be turned “ON” and connect the input to the output. The multiplexer circuits dissipate extremely low quiescent power over the full VDD−VSS and VDD−VEE supply voltage ranges, independent of the logic state of the control signals. When a logical “1” is present at the inhibit input terminal all channels are “OFF”. The IC offers a wide array of features such as high noise immunity and low thermal dissipation.

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Multiplexer

A multiplexer is a combinational logic circuit that switches one of several input lines to a single common output line. The select lines determine which input is connected to the output, and also to increase the amount of data that can be sent over a network within a certain time. It is also called a data selector.

Demultiplexer

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.

CD4051 Key Features

Wide range of digital and analog signal levels: digital 3 – 15V, analog to 15Vp-p
Low “ON” resistance: 80Ω (typ.) over entire 15Vp-p signal-input range for VDD − VEE = 15V
High “OFF” resistance:
- channel leakage of ±10 pA (typ.) at VDD − VEE = 10V
Logic level conversion for digital addressing signals of
- 3 – 15V (VDD − VSS = 3 – 15V) to switch analog signals
- to 15 Vp-p (VDD − VEE = 15V)
Matched switch characteristics:
- ∆RON = 5Ω (typ.) for VDD − VEE = 15V
Very low quiescent power dissipation under all
- digital-control input and supply conditions:
- 1 µ W (typ.) at VDD − VSS = VDD − VEE = 10V
Binary address decoding on chip

CD4051 Pinout

Pin No	Pin Name	Description
1	I/O 4	channel 4 i/o
2	I/O 6	channel 6 i/o
3	O/I	common i/o
4	I/O 7	channel 7 i/o
5	I/O 5	channel 5 i/o
6	INHIBIT	disable all channel
7	VEE	Emitter supply
8	VSS	source supply
9	C	input c
10	B	input b
11	A	input a
12	I/O 3	channel 3 i/o
13	I/O 0	channel 0 i/o
14	I/O 1	channel 1 i/o
15	I/O 2	channel 2 i/o
16	VDD	Drain supply