MC74LVXT4051MEL datasheet(11/16 Pages) ONSEMI

Part #	MC74LVXT4051MEL

Description	ANALOG MULTIPLEXER DEMULTIPLEXER HIGH-PERFORMANCE SILICON-GATE CMOS

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MC74LVXT4051

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APPLICATIONS INFORMATION

The Channel Select and Enable control pins should be at

VCC or GND logic levels. VCC being recognized as a logic

high and GND being recognized as a logic low. In this

example:

VCC =

)5 V = logic high

GND = 0 V = logic low

The maximum analog voltage swing is determined by the

supply voltages VCC and VEE. The positive peak analog

voltage should not exceed VCC. Similarly, the negative peak

analog voltage should not go below VEE. In this example,

the difference between VCC and VEE is five volts. Therefore,

using the configuration of Figure 21, a maximum analog

signal of five volts peak–to–peak can be controlled. Unused

analog inputs/outputs may be left floating (i.e., not

connected). However, tying unused analog inputs and

outputs to VCC or GND through a low value resistor helps

minimize crosstalk and feedthrough noise that may be

picked up by an unused switch.

Although used here, balanced supplies are not a

requirement. The only constraints on the power supplies are

that:

VEE – GND = 0 to

*6 volts

VCC – GND = 2.5 to 6 volts

VCC – VEE = 2.5 to 6 volts

and VEE

v GND

When voltage transients above VCC and/or below VEE are

anticipated on the analog channels, external Germanium or

Schottky diodes (Dx) are recommended as shown in

Figure 22. These diodes should be able to absorb the

maximum anticipated current surges during clipping.

ANALOG

SIGNAL

Figure 20. Application Example

ON

6

7

8

16

ANALOG

SIGNAL

)3.0 V

*3.0 V

11

10

9

TO EXTERNAL CMOS

CIRCUITRY 0 to 3.0 V

DIGITAL SIGNALS

Figure 21. Application Example

ANALOG

SIGNAL

ON

6

7

8

16

)5 V

ANALOG

SIGNAL

)5 V

GND

)5 V

GND

11

10

9

TO EXTERNAL CMOS

CIRCUITRY 0 to 5 V

DIGITAL SIGNALS

ON/OFF

7

8

16

VCC

VEE

Dx

VCC

Dx

VEE

Dx

VCC

Dx

VEE

Figure 22. External Germanium or Schottky Clipping Diodes

*3.0 V

)3.0 V

*3.0 V

)3.0 V

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MC74LVXT4051MEL Datasheet(PDF) 11 Page - ON Semiconductor

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