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MC14067B

Analog Multiplexers / Demultiplexers

ON Semiconductor 

MC14067B

APPLICATIONS INFORMATION

Figure A illustrates use of the Analog Multiplexer /

Demultiplexer. The 0−to−5 V Digital Control signal is used

to directly control a 5 Vp−p analog signal.

The digital control logic levels are determined by VDD

and VSS. The VDD voltage is the logic high voltage; the VSS

voltage is logic low. For the example. VDD = + 5 V = logic

high at the control inputs; VSS = GND = 0 V = logic low.

The maximum analog signal level is determined by VDD

and VSS. The analog voltage must swing neither higher than

VDD nor lower than VSS. The example shows a 5 Vp−p

signal which allows no margin at either peak. If voltage

transients above VDD and/or below VSS are anticipated on

the analog channels, external diodes (Dx) are recommended

as shown in Figure B. These diodes should be small signal

types able to absorb the maximum anticipated current surges

during clipping.

The absolute maximum potential difference between VDD

and VSS is 18.0 volts. Most parameters are specified up to

15 V which is the recommended maximum difference

between VDD and VSS.

+5 V

VDD

VSS

+5 V

EXTERNAL

CMOS

DIGITAL

CIRCUITRY

5 Vp−p

ANALOG SIGNAL

SWITCH

I/O

COMMON

O/I

5 Vp−p

ANALOG SIGNAL

0−TO−5 V DIGITAL

CONTROL SIGNALS

MC14067B

+5.0 V

+ 2.5 V

GND

Figure A. Application Example

VDD

DX

SWITCH

I/O

DX

COMMON

O/I

VDD

DX

DX

VSS

VSS

Figure B. External Germanium or Schottky Clipping Diodes

http://onsemi.com

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