CD4066B
CMOS QUAD BILATERAL SWITCH
SCHS051D – NOVEMBER 1998 – REVISED SEPTEMBER 2003
APPLICATION INFORMATION
In applications that employ separate power sources to drive V
DD
and the signal inputs, the V
DD
current capability
should exceed V
DD
/R
L
(R
L
= effective external load of the four CD4066B bilateral switches). This provision avoids
any permanent current flow or clamp action on the V
DD
supply when power is applied or removed from the CD4066B.
In certain applications, the external load-resistor current can include both V
DD
and signal-line components. To avoid
drawing V
DD
current when switch current flows into terminals 1, 4, 8, or 11, the voltage drop across the bidirectional
switch must not exceed 0.8 V (calculated from r
on
values shown).
No V
DD
current will flow through R
L
if the switch current flows into terminals 2, 3, 9, or 10.
12
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