__________Applications Information
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings may cause permanent damage to the devices.
Always sequence V+ on first, followed by the logic
inputs. If power-supply sequencing is not possible, add
two small signal diodes in series with supply pins for
overvoltage protection (Figure 1). Adding diodes
reduces the analog signal range to 1V below V+ and
1V above GND, but low switch resistance and low leak-
age characteristics are unaffected. Device operation is
unchanged, and the difference between V+ and GND
should not exceed 17V.
MAX4066/MAX4066A
Low-Cost, Low-Voltage, Quad, SPST,
CMOS Analog Switches
_______________________________________________________________________________________ 7
______________________________________________________________Pin Description
Ground87
Positive Supply Voltage1614
Logic Control Inputs15, 6, 7, 1413, 5, 6, 12
Not internally connected3, 11—
Analog Switch Common Terminal (bidirectional)2, 5, 10, 122, 4, 9, 10
Analog Switch Normally Open Terminal (bidirectional)1, 4, 9, 131, 3, 8, 11
GND
V+
IN1–IN4
N.C.
COM1–COM4
NO1–NO4
PIN
FUNCTION
DIP/SO QSOP
NAME
POSITIVE SUPPLY
COM
NO
V
g
V+
MAX4066
MAX4066A
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
