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MAX4853ETE

3.5Ω/7Ω Quad SPST Switches with Over-Rail Signal Handling

Maxim Integrated 

3.5Ω/7Ω Quad SPST Switches with Over-Rail

Signal Handling

Applications Information

Digital Control Inputs

The logic inputs (IN_) accept up to +5.5V even if the

supply voltages are below this level. For example, with a

+3.3V VCC supply, IN_ can be driven low to GND and

high to +5.5V, allowing for mixing of logic levels in a sys-

tem. Driving IN_ rail-to-rail minimizes power consump-

tion. For a +2V supply voltage, the logic thresholds are

0.5V (low) and 1.4V (high). For a +5V supply voltage, the

logic thresholds are 0.8V (low) and 1.8V (high).

Analog Signal Levels

The on-resistance of these switches changes very little

for analog input signals across the entire supply volt-

age range (see Typical Operating Characteristics). The

switches are bidirectional; therefore, NO_ and COM_

can be either inputs or outputs.

Comparator

The positive terminal of the comparator is internally set

to VCC / 3. When the negative comparator terminal

(CIN) is below the threshold (VCC / 3), the comparator

output (COUT) goes high. When CIN rises above

VCC / 3, COUT goes low.

The comparator threshold allows for detection of head-

phones since headphone audio signals are typically

biased to VCC / 2.

CAPACITANCE

METER

f = 1MHz

10nF VCC

VCC

COM_

MAX4851_

MAX4853_

IN

NO_

GND

VIL OR VIH

Figure 5. Channel Off-/On-Capacitance

Power-Supply Sequencing

Caution: Do not exceed the absolute maximum rat-

ings because stresses beyond the listed ratings

may cause permanent damage to the device.

Proper power-supply sequencing is recommended for

all CMOS devices. Always apply VCC before applying

analog signals, especially if the analog signal is not

current limited.

MAX4851_

NO_

VCC

3

CIN_

VCIN_

VTH = VCC/3

VCC

VCC

COUT_

GND

VTH + 100mV

VCOUT_

COMPARATOR

INPUT (VCIN_)

VTH - 100mV

VOUT tCOMP

COMPARATOR

OUTPUT (VCOUT_)

0V

50%

50%

tR < 20ns

tF < 20ns

50%

tCOMP

50%

Figure 6. Comparator Switching Time

PART

MAX4851

MAX4851H

MAX4853

MAX4853H

RON (Ω)

NO1/NO3

NO2/NO4

3.5

3.5

3.5

3.5

3.5

7

3.5

7

COMPARATORS

1

1

—

—

Selector Guide

OVER-RAIL HANDLING

Input signal passes through the switch.

High-impedance switch input.

Input signal passes through the switch.

High-impedance switch input.

12 ______________________________________________________________________________________

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