Precision, Quad, SPDT, CMOS Analog Switch
_____________________Pin Description
PIN
1, 10, 11, 20
2, 9, 12, 19
3, 8, 13, 18
4, 7, 14, 17
5
6
15
16
NAME
IN1-IN4
NO1-NO4
COM1-COM4
NC1-NC4
V-
GND
N.C.
V+
FUNCTION
Logic-Level Inputs
Normally Open Switches
Common Switch Poles
Normally Closed Switches
Negative Power Supply
Ground
Not Internally Connected
Positive Power Supply
V+
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. It is important not to exceed the
absolute maximum ratings because stresses beyond
the listed ratings may cause permanent damage to the
devices. Always sequence V+ on first, followed by VL,
V-, and logic inputs. If power-supply sequencing is not
possible, add two small signal diodes in series with the
supply pins (Figure 1). Adding the diodes reduces the
analog signal range to 1V below V+ and 1V below V-,
but low switch resistance and low leakage characteris-
tics are unaffected.
MAX333A
__________Applications Information
The main limitation of supply voltages other than ±15V is
a reduction in the analog signal range. The MAX333A
operates with ±5V to ±20V bipolar supplies. The
Typical Operating Characteristics
and graphs show typ-
ical on resistance for ±15V, ±10V, ±5 supplies.
Switching times increase by a factor of two or more for
±5V operation. The MAX333A can operate from +10V
to +24V unipolar supplies. It can be powered from a
single +10V to +24V supply, as well as from unbalanced
supplies such as +24V and -5V. Connect V- to 0V when
operating with a single supply.
Operation with Supply Voltages
Other than ±15V
o
COM_
NO_
( OR NC_)
V
g
V-
Figure 1. Overvoltage Protection Using Blocking Diodes
______________________________________________Test Circuits/Timing Diagrams
t
R
< 20ns
t
F
< 20ns
50%
0V
t
ON
t
OFF
+10V
V
COM
0V
-10V
t
OFF
t
ON
t
OPEN
50%
50%
t
OPEN
50%
50%
LOGIC
INPUT
+10V
-10V
IN_
V+
GND
V-
50%
NC_
COM_
NO_
300Ω
SWITCH OUTPUT
3V
V
IN
+15V
-15V
(REPEAT TEST FOR IN2, IN3, AND IN4.)
Figure 2. Switching-Time Test Circuit
_______________________________________________________________________________________
5
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