__________Applications Information

Operation with Supply Voltages

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.

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.

Precision, Quad, SPDT, CMOS Analog Switch

_______________________________________________________________________________________

5

PIN

FUNCTION

15

Not Internally Connected

6

Ground

5

Negative Power Supply

4, 7, 14, 17

Normally Closed Switches

16

Positive Power Supply

1, 10, 11, 20

Logic-Level Inputs

2, 9, 12, 19

Normally Open Switches

3, 8, 13, 18

Common Switch Poles

NAME

N.C.

GND

V-

NC1-NC4

V+

IN1-IN4

NO1-NO4

COM1-COM4

_____________________Pin Description

50%

0V

+10V

LOGIC

INPUT

V-

-15V

300

Ω

COM_

GND

(REPEAT TEST FOR IN2, IN3, AND IN4.)

+10V

IN_

NO_

50%

50%

50%

50%

50%

3V

0V

-10V

+15V

V+

NC_

-10V

SWITCH OUTPUT

Figure 2. Switching-Time Test Circuit

NO_

( OR NC_)

V+

COM_

V-

Figure 1. Overvoltage Protection Using Blocking Diodes

______________________________________________Test Circuits/Timing Diagrams