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MAX4524LETB

Low-Voltage, Single-Supply Analog Multiplexers/Switches

Maxim Integrated 

MAX4524L/MAX4525L

Low-Voltage, Single-Supply Analog

Multiplexers/Switches

Detailed Description

The MAX4524L/MAX4525L are low-voltage, single-sup-

ply CMOS analog switches that operate from a single

supply of +2V to +12V. Operation with a +12V supply opti-

mizes the performance by reducing their on-resistance

to 100Ω. The MAX4524L is configured as a 4-channel

multiplexer/demultiplexer and the MAX4525L is a double-

pole/double-throw (DPDT) switch. These devices have an

inhibit input (INH) to simultaneously open all signal paths.

Each switch can handle rail-to-rail analog signals. The

off-leakage current is typically only 0.1nA at +25°C and

10nA (max) over temperature. All digital inputs have 0.8V

to 2.0V logic-level thresholds, ensuring TTL/CMOS-logic

compatibility when using a single +12V supply.

Applications Information

Power-Supply Considerations

The MAX4524L/MAX4525Ls’ construction is typical of

most CMOS analog switches. The supply input, V+, is

used to power the internal CMOS switches and set the

limits of the analog voltage on any switch. Reverse ESD

protection diodes are internally connected between each

analog signal pin and both V+ and GND. If any analog

Test Circuits/Timing Diagrams

signal exceeds V+ or goes below GND, one of these

diodes conducts. During normal operation, these reverse-

biased ESD diodes leak, forming the only current drawn

from V+ or GND. Virtually all the analog leakage current

comes from the ESD diodes. Although the ESD diodes

on a given signal pin are identical, and therefore fairly

well balanced, they are reverse biased differently. Each is

biased by either V+ or GND and the analog signal. This

means that leakage varies as the signal varies. The differ-

ence in the two diode leakages to the V+ and GND pins

constitutes the analog signal-path leakage current. All

analog leakage current flows between each pin and one

of the supply terminals, not to the other switch terminal.

This is why both sides of a given switch can show leakage

currents of either the same or opposite polarity.

There is no connection between the analog signal paths

and GND. V+ and GND power the internal logic and logic-

level translators, and set both the input and output logic

limits. The logic-level translators convert the logic levels

into switched V+ and GND signals to drive the gates of

the analog signals. This drive signal is the only connection

between the logic supplies (and signals) and the analog

supplies.

VINH

50W

V+

V+

ADDA

NO0

ADDB

NO1–NO3

MAX4524L

INH

COM

GND

V+

300W

VOUT

35pF

VINH

50W

V+

V+

ADD

NO_

NC_

MAX4525L

INH

COM_

GND

V+

300W

VOUT

35pF

Figure 1. Inhibit Switching Times

V+

VINH

50%

0V

VNO0

VOUT

0V

tON

V+

VINH

0V

VNO_

90%

50%

VOUT

90%

0V

tON

90%

tOFF

90%

tOFF

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