__________Applications Information

Operation with Supply Voltages

Other than ±5V

Using supply voltages less than ±5V reduces the analog

signal range. The MAX4518/MAX4519 muxes operate

with ±2.7V to ±8V bipolar supplies or with a +2.7V to

+15V single supply. Connect V- to GND when operating

with a single supply. Both device types can also operate

with unbalanced supplies, such as +10V and -5V. The

Typical Operating Characteristics graphs show typical

on-resistance with ±3V, ±5V, +3V and +5V supplies.

(Switching times increase by a factor of two or more for

operation at 5V.)

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 can cause permanent damage to the devices.

Always sequence V+ on first, then V-, followed by the

logic inputs, NO, or COM. If power-supply sequencing

is not possible, add two small signal diodes (D1, D2) in

series with supply pins for overvoltage protection

(Figure 1). Adding diodes reduces the analog signal

range to one diode drop below V+ and one diode drop

above V-, but does not affect the devices’ low switch

resistance and low leakage characteristics. Device

operation is unchanged, and the difference between

V+ and V- should not exceed 17V. These protection

diodes are not recommended when using a single supply.

Precision, 4-Channel/Dual 2-Channel,

Low-Voltage, CMOS Analog Multiplexers

8

_______________________________________________________________________________________

______________________________________________Test Circuits/Timing Diagrams

COM

V-

V+

NO

* INTERNAL PROTECTION DIODES

D2

D1

-5V

+5V

MAX4518

MAX4519

*

*

*

*

Figure 1. Overvoltage Protection Using External Blocking Diodes

50%

+3V

0V

0V

LOGIC

INPUT

SWITCH

OUTPUT

+5V

-5V

GND

V+

V+

V+

A1

V-

EN

A0

NO1

NO2–NO3

NO4

COM

+5V

-5V

50

Ω

MAX4518

300

Ω

35pF

A1

A0

+5V

-5V

GND

V+

V-

EN

NO1B

COMA, NO1A–NO2A

NO2B

COMB

+5V

50

Ω

MAX4519

300

Ω

35pF

90%

90%

-5V

Figure 2. Transition Time