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MC14551BD
(Rev.:2000)

Quad 2-Channel Analog Multiplexer/Demultiplexer

ON Semiconductor 

MC14551B

APPLICATIONS INFORMATION

Figure A illustrates use of the on–chip level converter

detailed in Figure 2. The 0–to–5 volt Digital Control signal

is used to directly control a 9 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 VEE. The VDD voltage determines the maximum

recommended peak above VSS. The VEE voltage

determines the maximum swing below VSS. For the

example, VDD – VSS = 5 volt maximum swing above VSS;

VSS – VEE = 5 volt maximum swing below VSS. The

example shows a ± 4.5 volt signal which allows a 1/2 volt

+5 V

margin at each peak. If voltage transients above VDD and/or

below VEE 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 VEE is 18.0 volts. Most parameters are specified

up to 15 volts which is the recommended maximum

difference between VDD and VEE.

Balanced supplies are not required. However, VSS must

be greater than or equal to VEE. For example, VDD =

+ 10 volts, VSS = + 5 volts, and VEE = – 3 volts is acceptable.

See the table below.

-5 V

+5 V

EXTERNAL

CMOS

DIGITAL

CIRCUITRY

VDD VSS

VEE

9 Vp-p

ANALOG SIGNAL

0-TO-5 V DIGITAL

CONTROL SIGNAL

SWITCH

I/O

COMMON

O/I

MC14551B

CONTROL

9 Vp-p

ANALOG SIGNAL

+4.5 V

GND

-4.5 V

Figure A. Application Example

VDD

VDD

Dx

SWITCH

I/O

Dx

Dx

COMMON

O/I

Dx

VEE

VEE

Figure B. External Schottky or Germanium Clipping Diodes

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ POSSIBLE SUPPLY CONNECTIONS

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VDD

In Volts

VSS

In Volts

VEE

In Volts

Control Inputs

Logic High/Logic Low

In Volts

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 8

0

–8

+ 8/0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5

0

– 12

+ 5/0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5

0

0

+ 5/0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5

0

–5

+ 5/0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 10

–5

+ 10/ + 5

Maximum Analog Signal Range

In Volts

+ 8 to – 8 = 16 Vp–p

+ 5 to – 12 = 17 Vp–p

+ 5 to 0 = 5 Vp–p

+ 5 to – 5 = 10 Vp–p

+ 10 to – 5 = 15 Vp–p

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