MC74LVXT4053_05 Datasheet, PDF (11/14 Pages) ON Semiconductor – Analog Multiplexer/Demultiplexer High−Performance Silicon−Gate CMOS

MC74LVXT4053
APPLICATIONS INFORMATION
The Channel Select and Enable control pins should be at
V_CC or GND logic levels. V_CC being recognized as a logic
high and GND being recognized as a logic low. In this
example:
V_CC = )5 V = logic high
GND = 0 V = logic low
The maximum analog voltage swing is determined by the
supply voltages V_CC and V_EE. The positive peak analog
voltage should not exceed V_CC. Similarly, the negative peak
analog voltage should not go below V_EE. In this example,
the difference between V_CC and V_EE 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 V_CC 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:
V_EE − GND = 0 to *6 volts
V_CC − GND = 2.5 to 6 volts
V_CC − V_EE = 2.5 to 6 volts
and V_EE v GND
When voltage transients above V_CC and/or below V_EE are
anticipated on the analog channels, external Germanium or
Schottky diodes (D_x) are recommended as shown in
Figure 22. These diodes should be able to absorb the
maximum anticipated current surges during clipping.
+3.0 V
−3.0 V
ANALOG
SIGNAL
+3.0 V
16
ANALOG
ON
SIGNAL
+3.0 V
−3.0 V
+5 V
GND
ANALOG
SIGNAL
+5 V
16
ANALOG
ON
SIGNAL
+5 V
GND
−3.0 V
6
11
7
10
8
9
TO EXTERNAL CMOS
CIRCUITRY 0 to 3.0 V
DIGITAL SIGNALS
Figure 20. Application Example
6
11
TO EXTERNAL CMOS
7
10
CIRCUITRY 0 to 5 V
8
9
DIGITAL SIGNALS
Figure 21. Application Example
V_CC
D_x
D_x
V_EE
V_EE
V_CC
16
V_CC
D_x
ON/OFF
D_x
V_EE
7
8
Figure 22. External Germanium or Schottky Clipping Diodes
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